JP2001272448A - Seismic displacement measurement device for structures - Google Patents

Abstract

(57) [Summary] [Problem] A conventional vibration displacement measuring device for a structure has a problem that a large amount of cost is required because many optical cameras are required. SOLUTION: In a structural vibration displacement measuring device, a plurality of radio transmitters 2 transmitting radio waves of different frequencies from each other.
A plurality of antennas 3, a band-pass filter 7 for discriminating a signal received by the antenna 3 into a signal for each radio wave transmitted from each radio wave transmitter 2, and a phase difference between received radio waves between the two antennas 3 And a position calculating means 9 for finding the intersection of three equal phase difference planes and estimating the position of the radio wave transmitter 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring a vibration of a structure to be measured by measuring the distortion and the displacement from a reference position of the structure to be measured by using radio waves.

[0002]

2. Description of the Related Art Measuring the response of a building mounted on a shaker or the displacement or strain of a bridge or other structure due to vibration is very useful for research on improving earthquake resistance or preventing fatigue failure. . In order to measure displacement and strain due to vibration, it is necessary to precisely measure the positions of a plurality of measurement points distributed over the entire structure. However, as can be understood by assuming, for example, the case of analyzing the shaking of the wall surface of a building, such measurement points are generally dispersed over a wide range.

FIG. 9 is a schematic view showing an example of a conventional vibration displacement measuring device for a structure. In the figure, 101 is a wall surface of a building to be measured, 102 is an optical camera, 10
Reference numeral 3 denotes a positioning calculation unit that converts an image of the camera 102 into position information. The plurality of cameras 102 measure the displacement of the measurement point by viewing the measurement point in the field of view and stereoscopically viewing.

[0004]

Since the conventional apparatus for measuring the vibration displacement of a structure is constructed as described above, the field of view of the optical camera 102 is the wall 1 of the structure to be measured.
In order to simultaneously measure the displacements of all measurement points that are narrower than 01 and widely distributed on the wall, a large number of cameras with different fields of view for each measurement point or for each group consisting of adjacent measurement points Is required. However, if the position of the camera 102 is sufficiently separated from the wall surface 101 to be measured, many measurement points can be captured in the field of view of one camera. However, if the distance between the camera and the measurement point is large, the measurement accuracy of the displacement measurement becomes high. to degrade. Therefore, in the conventional vibration displacement measuring device for a structure, it is inevitable that a large number of cameras are required, and therefore, there is a problem that a large cost is required.

Further, in the conventional vibration displacement measuring device for a structure, since the displacement is measured by using an optical image, there is a problem that the measurement accuracy is greatly affected by the surrounding environment such as lighting.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has been developed for a structure capable of simultaneously and precisely measuring the displacement of each measurement point in a wide measurement range of the structure at low cost. The purpose is to obtain a vibration displacement measuring device.

[0007]

According to the present invention, there is provided an apparatus for measuring a vibration displacement of a structure according to the present invention, comprising: a plurality of radio transmitters provided at each measurement point for transmitting radio waves having different frequencies; A plurality of antennas, a plurality of band-pass filters provided for each antenna, and a plurality of band-pass filters for discriminating a signal received by each antenna into a signal of a corresponding frequency band for each radio wave transmitter; Phase difference detecting means for detecting a phase difference of a received radio wave between the two antennas of each combination for at least three different combinations of the two antennas for each radio wave of a different frequency transmitted from the radio transmitter. And the phase difference for at least three different combinations of two antennas for each different frequency of radio waves transmitted from the radio transmitter Seeking at least three intersections of equal phase differences surface directed et respectively, is obtained by so and a positioning calculation means for estimating the position of a radio wave transmitter for transmitting a radio wave of the frequency.

According to a vibration displacement measuring apparatus for a structure according to the present invention, a positioning calculation means corrects a phase difference error of a combination of two antennas caused by a transmission phase error related to a path of a receiver. A phase difference correction amount storage unit for storing a correction amount is provided.

[0009] A vibration displacement measuring device for a structure according to the present invention includes a radio wave transmitter arranged at a known position.

[0010] The vibration displacement measuring device for a structure according to the present invention is provided for each measuring point, and applies two types of carrier frequencies to the individual frequencies assigned to each of the measuring points, thereby obtaining two types of frequencies. A plurality of radio wave transmitters for transmitting radio waves, a plurality of antennas arranged at different positions from each other, and a plurality of antennas are provided for each antenna in units of each carrier frequency, and a signal received by each antenna is transmitted by radio wave. A plurality of band-pass filters for discriminating signals in individual frequency bands for each device, and at least three different combinations of two antennas among a plurality of antennas in units of each carrier frequency, are transmitted from the radio wave transmitter. Phase difference for detecting the phase difference of the received radio wave between two antennas of each combination for each radio wave of different frequency Output means and, for each radio wave transmitter, an equiphase difference plane for each combination is determined from two phase differences obtained for each carrier frequency for each combination for the two antennas. And a positioning calculation means for determining an intersection of at least three phase difference planes and estimating the position of the radio wave transmitter.

A vibration displacement measuring device for a structure according to the present invention is provided at a plurality of radio wave transmitters provided at each measurement point and transmitting radio waves modulated by orthogonal modulation codes, respectively, at different positions. Multiple antennas,
A plurality of matched filters provided for each antenna and capable of corresponding to modulation codes of each radio transmitter so as to discriminate signals received by each antenna for each signal transmitted from the radio transmitter. And for at least three different combinations of two antennas among a plurality of antennas, for each radio wave modulated with a different modulation code transmitted from a radio transmitter, reception between the two antennas of each combination is performed. Phase difference detecting means for detecting a phase difference between radio waves, and at least each radio wave modulated with a different modulation code transmitted from the radio wave transmitter, at least each of which is derived from the phase difference for at least three different combinations of the two antennas. The position of an electric wave transmitter that transmits an electric wave modulated by the modulation code by finding an intersection of three equal phase difference surfaces. Estimating a is obtained by so and a positioning computation unit.

A vibration displacement measuring device for a structure according to the present invention includes a plurality of radio transmitters provided for each measurement point and transmitting radio waves having different transmission timings, and a plurality of antennas arranged at different positions from each other. Is provided for each antenna, and becomes conductive in synchronization with the transmission timing of each radio transmitter so that signals received by each antenna are discriminated for each signal transmitted from the radio transmitter. For at least three different combinations of the plurality of switches and two of the plurality of antennas, for each radio wave having a different transmission timing transmitted from the radio wave transmitter, the difference between the two antennas of the respective combination is determined. Phase difference detecting means for detecting the phase difference of the received radio wave, and having different transmission timings transmitted from the radio wave transmitter For each wave, determine the intersection of at least three equal phase difference planes derived from the phase differences for at least three different combinations of the two antennas, and determine the position of the radio transmitter transmitting the radio wave having the transmission timing. And a positioning calculation means for estimating the position.

According to the present invention, there is provided an apparatus for measuring a vibration displacement of a structure, comprising: a plurality of radio transmitters provided at each measurement point for transmitting radio waves having different frequencies; a plurality of antennas arranged at different positions; A plurality of band-pass filters are provided for each antenna and discriminate signals received by each antenna into signals in a corresponding frequency band for each radio wave transmitter, and two of the plurality of antennas For at least three different combinations,
A delay time difference detecting means for detecting a delay time difference of a received radio wave between two antennas associated with each combination for each radio wave of a different frequency transmitted from the radio transmitter, and a radio wave of a different frequency transmitted from the radio transmitter For each time, an intersection of at least three equal delay time difference planes respectively derived from delay time differences of at least three different combinations related to two antennas is obtained, and a position of a radio transmitter transmitting a radio wave of the frequency is estimated. And a calculation means.

[0014] A vibration displacement measuring device according to the present invention comprises a plurality of radio transmitters provided at each measurement point for transmitting radio waves modulated by orthogonal modulation codes, and a plurality of radio transmitters arranged at mutually different positions. Antennas and a plurality of antennas provided for each antenna, each of which can correspond to a modulation code for each radio transmitter so as to discriminate a signal received by each antenna for each signal transmitted from the radio transmitter. For at least three different combinations of a matched filter and at least two antennas among a plurality of antennas, for each radio wave modulated with a different modulation code transmitted from a radio transmitter, two
Delay time difference detecting means for detecting a delay time difference of a received radio wave between two antennas, and a delay for at least three different combinations of the two antennas for each radio wave modulated by a different modulation code transmitted from the radio wave transmitter Positioning calculation means for determining the intersection of at least three equal delay time difference planes respectively derived from the time difference and estimating the position of a radio wave transmitter for transmitting a radio wave modulated by the modulation code.

A vibration displacement measuring device according to the present invention comprises: a plurality of radio transmitters provided at each measurement point for transmitting radio waves having different transmission timings; a plurality of antennas disposed at different positions; A plurality of switches provided for each of the antennas and turned on in synchronization with the transmission timing of each of the radio transmitters so as to discriminate the signal received by each antenna for each signal transmitted from the radio transmitter. And, for at least three different combinations of two antennas among the plurality of antennas, for each radio wave having different transmission timings transmitted from the radio wave transmitter, the reception radio waves between the two antennas of the respective combinations are A delay time difference detecting means for detecting a delay time difference, and having different transmission timings transmitted from the radio wave transmitter For each wave, determine the intersection of at least three equal delay time difference planes respectively derived from the delay time differences for at least three different combinations of the two antennas, and determine the position of the radio wave transmitter transmitting the radio wave having the transmission timing. And a positioning calculation means for estimating the position.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below.
explain. Embodiment 1 FIG. 1 shows a first embodiment of the present invention.
It is a lineblock diagram showing a vibration displacement measuring device of a structure. In FIG.
Where 1 is the wall surface of the structure to be measured, 2_j(J =
1 to n: j is the transmitter number) is each measurement on the wall 1
Radio transmitter installed at the point, 3 _i(I = 1 to 4: i is a
Antenna numbers) are located at different positions from each other
Antenna, 4 is a local oscillator, 5_i(I is the antenna number)
Is a downconverter connected to the corresponding antenna, 6
_i(I is the antenna number) is the A / D converter, 7_ij(I is
Antenna number, j is the transmitter number) is set for each antenna
And the center frequency of the pass band is f₁~ F_nIs
Bandpass filters, 8a, 8b and 8c are antennas respectively.
Na 3₁And antenna 3₂, Antenna 3₁And antenna 3₃,
Antenna 3 ₁And antenna 3₄The same source measured in
Phase difference detecting means for detecting the phase difference between these radio waves, 9 is the positioning
The calculation means 10 is a display means. The antenna 3₁
~ 3 ₄Are arranged in a non-linear array and these
Multiple transmitters 2 for antenna₁~ 2_nSinusoidal
You.

Next, the operation will be described. Telecommunications transmitter ₂ 1 to 2 _n, which is installed in each measurement point, the carrier frequency _{f c}
(F ₁ + f _c ),..., (F _n +
A radio wave having a frequency of _fc ) is transmitted. Where f ₁ , ...,
f _n is a sufficiently small value compared with _{f c.} These radio waves are received at least four receive antennas 3 ₁ to 3 ₄ are installed in different positions. Further, the position of the i-th receiving antenna 3 _i is represented by q _i = [X _i , Y _i , Z _i ]. The underline added to q indicates a vector in the specification of the present application, and has the same meaning in the following description.

The signal received by the receiving antenna 3 _i of each is multiplied with the local oscillation signal of a frequency f _c which is output from the local oscillator 4 in the down converter 5 _i, respectively f _1,
..., it is converted into a signal having a frequency of f _n. After the received signals are converted into digital signals by the A / D converter 6 _i, passes through the band-pass filter 7 _ij, are distinguished in the signals for each radio transmitter 2 _j. That is, the signal output from the band-pass filter 7 _in is only the received signal r ′ _{n, i} from the radio transmitter 2 _{n at} the n-th measurement point.

Since the radio waves from the plurality of transmitters 2 _j can be processed independently by the operation of the band-pass filter 7 _ij , the position p of the n-th measurement point p = [x, y,
The operation will be described with the positioning processing for estimating z] as a representative. Telecommunications s emitted from the radio wave transmitter 2 _n installed in the n measurement points (t) = exp [j2π ( f c + f n) t] is received by the receiving antenna 3 ₁ to 3 _4.

[0020] The first receiving antenna 3 ₁ and the second received signal in the receiving antenna 3 ₂ is given by the following equations. r _{n, 1} (t) = s (t) exp [jφ ₁ ] (1) r _{n, 2} (t) = s (t) exp [jφ ₂ ] (2) where φ ₁ and φ ₂ are respectively Receiving antennas 3 ₁ , 3 ₂
, And can be expressed as the following equation.

(Equation 1) Here, _{k i} is an integer. Note that { p − q _i } is the distance from the measurement point (transmitter 2 _n ) to the receiving antenna 3 _i , λ≡
_{c / (f c + f n} ) is radio wave wavelength, c is shows the radio wave speed (speed of light). Bandpass filters 7 _1n , 7
_The received signals r ′ _{n, 1} , r ′ _{n, 2} output from _2n are as follows.

(Equation 2) The phase difference detecting means 8a receives the received signals r ' _{n, 1} (t) and r'
The phase difference Δφ ₁₂ ≡φ ₁ −φ ₂ of the received signal is measured by obtaining the correlation with _{n, 2} (t) as in the following equation.

(Equation 3) Here, <> gives an averaging operation with respect to time t, and * represents a complex conjugate. Phase difference detecting means 8b, 8c likewise, the received signal r for each receiving antenna _{3 1} '
_{n, 1} (t) and the receiving antenna _{3 3} of the received signal r _{'n, 3} (t)
Phase difference Δφ ₁₃ ≡φ ₁ -φ _3, the phase difference [Delta] [phi ₁₄ between the receiving antenna _{3 1} of the received signal r _{'n, 1} (t) and the received signal of the receiving antenna _{3 4 r' n, 4 (} t) and the measure ≡φ ₁ -φ _4.

The positioning calculation means 9 calculates the phase difference Δφ ₁₂ ,
By inputting Δφ ₁₃ and Δφ ₁₄ and performing a positioning calculation described later, the position p = [x, y, z] of the n-th measurement point is calculated and output to the display means 10. Positioning calculation means 9
Calculates the position similarly by inputting the phase difference between the output signals of the different band-pass filters for the other measurement points,
The display means 10 displays the distribution of the vibration displacement of the wall surface to be measured by combining the positions of all the measurement points.

Next, positioning calculation by the positioning calculation means 9 will be described. When the equations (3) and (4) are substituted into the relationship of the phase difference Δφ ₁₂ ≡φ ₁ −φ ₂ , the position of the measurement point p =
An equation for [x, y, z] can be obtained as follows.

(Equation 4) _{Here, k 12} is the _{k 12 ≡k 1} -k ₂ becomes an integer,
Hereinafter, k is referred to as an integer value bias. Similarly, the following relational expression holds for the phase difference Δφ ₁₃ and the phase difference Δφ ₁₄ .

(Equation 5)

Therefore, the integer biases k ₁₂ , k
₁₃ and k ₁₄ are known from information such as the initial position of the measurement point, and the phase differences Δφ ₁₂ , Δφ ₁₃ and Δφ ₁₄
, By solving the equations (8), (9) and (10), the position p = [x, y, z] of the n-th measurement point is obtained.
Can be determined. Similarly, the positions of the other measurement points can be independently estimated.

FIG. 2 is a diagram showing an equal phase difference plane related to radio waves received by two antennas. As shown in FIG. 2, satisfying the formula (8) [x, y, z] is present on the equal phase difference surface of the phase difference [Delta] [phi ₁₂ provided as a paraboloid. FIG. 3 is a diagram illustrating an intersecting state of two types of equal phase difference surfaces. As in the case of formula (8), satisfies the equation (9) [x, y, z] is because present on equiphase difference surface of the phase difference [Delta] [phi _13, the presence of [x, y, z] Range is phase difference Δφ
₁₂ is limited to the intersection curve between the equal phase difference surface according to ₁₂ and the equal phase difference surface according to the phase difference Δφ ₁₃ . Further, to satisfy the formula (10) [x, y, z] is because present on equiphase difference surface of the phase difference [Delta] [phi _14, the above intersection curve and the phase difference [Delta] [phi
_By calculating the intersection with the equal phase difference surface according to ₁₄ , the position p = [x, y, z] of the n-th measurement point can be determined.

As described above, according to the first embodiment, a plurality of radio transmitters 2j provided at each measurement point and transmitting radio waves having different frequencies are provided with a plurality of radio transmitters _2j arranged at different positions. an antenna 3 _i, provided for each antenna 3 _i, the corresponding band-pass filter 7 for discriminating the signals in the frequency band that _ij of the radio wave transmitter every 2 _j a respective antenna signals received at 3 _i, a plurality antenna 3 _i for at least three different combinations according to the two antennas 3 _i of among, the different frequency radio wave every transmitted from the radio wave transmitter 2 _j, between the two antennas 3 _i in accordance with each combination phase difference detecting means for detecting a phase difference of the received radio wave (8a, 8b, 8c) and, different from each radio wave of frequency transmitted from the radio wave transmitter 2 _j, 2 two antennas 3
seeking each of the three intersections of equal phase differences surface derived from the phase difference for three different combinations according to _i, and a positioning calculation means 9 for estimating the position of the radio transmitters 2 _j that transmits signals of the frequency since it is configured to include, and receives radio waves transmitted from the radio wave transmitter 2 _j to be measurement points are distributed over a wide range according to all the measurement points in the antenna 3 _i, transmitted from the radio wave transmitter 2 _j since it is possible to calculate the position of the radio transmitters 2 _j based on the phase difference between the antennas 3 _i in accordance with each combination for each radio independently being, each measurement in a wide measuring range for structure There is an effect that the positions of points can be simultaneously and independently estimated.

Further, since the position of the measurement point is obtained from the phase difference of the radio wave, the position of the measurement point is several to one-tenths of the wavelength of the radio wave
There is an effect that the position can be estimated with high accuracy with a precision of 1 /. In addition, since measurement is performed using radio waves, the measurement is not affected by the surrounding lighting environment, so that there is an effect that sufficient measurement accuracy can be obtained even in a dark room or outdoors at night.

Furthermore, in the embodiment of the present invention, a large number of radio transmitters are required to measure a wide measurement range.
Since the position is calculated from the phase difference of the received signal, the restriction on the waveform of the transmitted radio wave is reduced, and a radio transmitter with a simple structure can be used. This has the effect of enabling high-precision observation at low cost.

In this embodiment, the radio transmitter 2
Although it configured to emit a sine wave signal from the _j, also using the signal of an arbitrary waveform having a frequency passband width less of the band-pass filter 7 _ij the same effect.

The phase difference detecting means (8a, 8b, 8)
c) the phase difference between the received signal and the antenna 3 ₂ of the received signal of the antenna 3 _1, antenna 3 ₁ of the received signal and the antenna 3
Phase difference between the received signal ₃ is configured so as to detect a phase difference between the received signal of the antenna 3 ₁ of the received signal and the antenna 3 _4, antenna 3 ₂ of the received signal and the antenna 3 ₄
A configuration using a phase difference obtained from a combination of other received signals, such as a phase difference from the received signal of the above, may be employed. In this case, the same effect can be obtained.

The local oscillator 4, frequency conversion of a received signal by down-converter 5 _i can also be used to further receiver structure superheterodyne or the like into a plurality of stages. Further, the A / D converter 6 _i is provided with a band-pass filter 7.
can also be placed downstream of the _ij, may be the phase difference detecting unit 8 by omitting the A / D converter 6 _i is configured to detect a phase difference by inputting an analog signal. Further, although the amplifier of the received signal is omitted in FIG. 1, it can be inserted, for example, immediately after the receiving antenna _3i .

Second Embodiment In the first embodiment, the transmission phase error relating to the path of the receiver from the antenna _3i to the phase difference detecting means 8 is not taken into consideration. There is an error. Therefore, Embodiment 1
In the configuration of the vibration displacement measuring device for a structure according to the above, an error occurs in the phase difference used by the positioning calculation means 9, and as a result, the positioning accuracy of the measurement point is deteriorated. The vibration displacement measuring apparatus for a structure according to the second embodiment differs from the first embodiment in that the transmitted phase error is compensated. The structure of the structure vibration displacement measuring device according to the second embodiment is basically the same as the structure vibration displacement measuring device according to the first embodiment shown in FIG. The difference is that a phase correction amount storage unit is provided.

Next, the operation will be described. FIG. 4 is a flowchart showing a process of deriving a transmitter position using the structural vibration displacement measuring apparatus according to Embodiment 2 of the present invention. First, at a time when the structure is stationary before or after the measurement, when any radio transmitter _2j is at a known position, or at a position where the position can be determined by another measuring means such as a laser. , The position [x ₀ , y ₀ , z ₀ ]
Is recorded (step ST1). Then, the phase difference detecting means (8a, 8b, 8c) with, for radio waves transmitted from the radio wave transmitter 2 _j at a known position, the antenna 3
phase difference Δφ ₁₂ , Δφ ₁₃ , Δφ ₁₄ of the received signal between _i
Is measured (step ST2).

Next, the following expressions (11) to (13) are satisfied.
Phase difference Δφ to be added⁰ ₁₂, Δφ⁰ _{1 3}, Δφ⁰ ₁₄Seeking
Confuse. The radio transmitter 2_jIs a known position [x₀,
y₀, Z ₀], The geometric conditions
These two antennas 3_iOf the received signal according to the combination of
Phase difference Δφ⁰ ₁₂, Δφ⁰ ₁₃, Δφ⁰ ₁₄Is given by the formula (1)
1) to (13) are uniquely determined.

(Equation 6) Phase difference Δφ ⁰ _12, Δφ ⁰ _13, as long required [Delta] [phi ⁰ _14, using the following equation (14) to (16), each of the two antennas due to transmission phase error according to the path of the receiver The transmission phase difference correction amounts η ₁₂ , η ₁₃ and η ₁₄ for correcting the phase difference error for the combination of are calculated, and these transmission phase difference correction amounts are calculated by the phase difference correction amount provided in the positioning calculation means 9. Stored in the quantity storage unit (step ST
3). η ₁₂ = Δφ ₁₂ −Δ ⁰ ₁₂ (14) η ₁₃ = Δφ ₁₃ −Δ ⁰ ₁₃ (15) η ₁₄ = Δφ ₁₄ −Δ ⁰ ₁₄ (16)

Next, when measuring the position of the measurement point, the phase difference detection
The output means 8 includes the radio wave transmitter 2_jFor each radio wave transmitted from
Phase difference Δφ of received signal₁₂, Δφ₁₃, Δφ₁₄Measure
(Step ST4). Phase difference Δφ₁₂, Δφ₁₃,
Δφ₁₄Is measured, the positioning calculation means 9 calculates the phase difference
Transmission phase difference correction amount η stored in the positive amount storage unit₁₂, Η
₁₃, Η₁₄Using the following equations (17) to (19)
The phase difference is corrected as shown in FIG.
5). Δφ₁₂← Δφ₁₂−η₁₂ (17) Δφ₁₃← Δφ₁₃−η₁₃ (18) Δφ₁₄← Δφ₁₄−η₁₄ (19) If the phase difference is corrected, the positioning calculation means 9 outputs the corrected position.
Phase difference Δφ₁₂, Δφ_{1 3}, Δφ₁₄The form of implementation using
Similarly to the state 1, the positions of the measurement points are obtained from Expressions (8) to (10).
p= [X, y, z] is calculated.

As described above, according to the second embodiment, the positioning calculation means 9 corrects the transmission error for correcting the phase difference error of the combination of two antennas caused by the transmission phase error related to the path of the receiver. Since the apparatus is provided with the phase difference correction amount storage unit for storing the phase difference correction amount, the phase difference obtained from the phase difference detection means 8 is corrected, and the position of the measurement point is calculated based on the accurate phase difference. Therefore, there is an effect that it is possible to prevent deterioration of the positioning accuracy related to the measurement point position.

In the second embodiment, before and after the measurement, an arbitrary radio transmitter _2j is positioned at a known position [x ₀ , y ₀ , z ₀ ].
, The transmission phase difference correction amounts η ₁₂ , η ₁₃ , η ₁₄
Seeking. Alternatively, a configuration in which a transmitter at a known position is separately provided may be employed. FIG. 5 is a configuration diagram illustrating a vibration displacement measuring device for a structure according to a modification of the second embodiment of the present invention. In FIG. 5, the same reference numerals as those in FIG. 1 denote the same or corresponding parts, and a description thereof will be omitted. Reference numeral 20 denotes a separately provided radio transmitter at a known position [x ₀ , y ₀ , z ₀ ]. Also, 7 _i0 (i is an antenna number) is provided for each antenna, and (f ₀ +
This is a band-pass filter having a center frequency f ₀ of a pass band through which a reception signal from the radio wave transmitter 20 transmitting the radio wave of the frequency f _c ) passes.

By using the above-described configuration, it is possible to prevent the positioning accuracy from deteriorating at the measurement point position, as described above, and to obtain a known position outside the measurement range of the structure. Since the radio transmitter 20 is provided at [x ₀ , y ₀ , z ₀ ], it is not necessary to measure the initial position of the radio transmitter using another measuring means such as a laser. There is an effect that the configuration can be simplified. Further, by adding the band-pass filter 7 _i0 having the center frequency of the pass band of f ₀ , the transmission phase correction processing can be performed simultaneously with the measurement point measurement.

Embodiment 3 In the first embodiment, the integer value biases k ₁₂ , k ₁₃ ,
it is assumed that k ₁₄ is known. However,
When it is difficult to know k ₁₂ , k ₁₃ , and k ₁₄ ,
In order to avoid ambiguity in the estimated position due to the integer value bias, it is required to use a radio wave of a long wavelength, and therefore, sufficient positioning accuracy may not be obtained. This is because positioning accuracy is generally inversely proportional to wavelength. The vibration displacement measuring apparatus for a structure according to the third embodiment is capable of measuring the position of the measurement point without ambiguity even when the integer biases k ₁₂ , k ₁₃ , and k ₁₄ are unknown.
Is different from

FIG. 6 is a block diagram showing a structure for measuring a vibration displacement of a structure according to a third embodiment of the present invention. 6, the same reference numerals as those in FIG. 1 denote the same or corresponding parts, and a description thereof will not be repeated. 31 _j (j = 1 to n: j is the transmitter number) is set at each measurement point on the wall surface 1 and the frequency (f _j
+ _{F c1)} of radio frequency _(radio wave transmitter for transmitting two types of radio waves and radio waves _{f j + f c2), 32} 1, 32 2 are distributor, 33 ₁ generates a local oscillation signal of a frequency _{f c1} local oscillator, 33 ₂ local oscillator, 34a, 34b, respectively 34c antenna _{3 1} and the antenna _{3 2} for generating a local oscillation signal of a frequency _{f c2,} antenna _{3 1} and the antenna ₃ 3,
Phase difference detecting means for detecting a phase difference of a radio wave frequency _(f j ₊ f _c1) from the antenna _{3 1} and the antenna ₃ same transmission source as measured at _{4, 34a ', 34b',} 34c ' and each antenna _{3 1} antenna _{3 2,} antenna _{3 1} and the antenna _{3 3,} antenna _{3 1} and radio wave phase difference detecting means for detecting a phase difference between the frequency _(f j ₊ f _c2) from the same transmission source as measured by the antenna _{3 4,} 35 It is a positioning calculation means. Here, _fc1 and _fc2 are different carrier frequencies.

Next, the operation will be described. Embodiment 1
Similarly to the above, the radio waves from the plurality of transmitters 31 _j can be processed independently by the operation of the band-pass filter 7 _ij , and thereafter, the position p = [x, y,
The operation will be described with the positioning processing for estimating z] as a representative. The radio transmitter 31 _n installed at the n-th measurement point transmits the radio wave of the frequency (f _n + f _c1 ) and the radio wave of the frequency (f _n + f _c2 ), that is, of the wavelength λ ₁ ≡c / (f _n + f _c1 ). Two types of radio waves, a radio wave and a radio wave of a wavelength λ ₂ ≡c / (f _n + f _c2 ), are emitted.

[0041] These radio waves are received by at least four receive antennas 3 ₁ to 3 ₄ are installed at different positions,
These received signals distributor ₃₂ 1, 32 ₂ are distributed respectively, the local oscillation signal of a frequency _{f c1} which local oscillator 33 ₁ by the down converter _{5 i} is output, and local oscillator 33 ₂
There is multiplied by the local oscillation signal of a frequency f _c2 which outputs, is converted into a signal of a frequency of f _n together. These received signals are converted into digital signals by the A / D converter 6 _i respectively, are discriminated in the signal of each radio transmitter 31 _j in the band pass filter 7 _ij. Thus, the phase difference detecting means 34
Reference numerals a to c denote the phase differences Δφ ₁₂ , Δφ ₁₃ , and Δφ ₁₄ of the reception signal of the radio wave of the wavelength λ ₁ respectively,
4A'～34c 'the phase difference [Delta] [phi] ₁₂ of the wavelength lambda ₂ of the radio wave of the received signal, respectively, [Delta] [phi] _13, to measure the [Delta] [phi] _14.

The positioning calculation means 35 calculates the following equation (20)
In order to satisfy Expression (22), the integer value bias k ₁₂ ,
Determine k ₁₃ , k ₁₄ and l ₁₂ , l ₁₃ , l ₁₄ .

(Equation 7) Equations (20) to (22) above represent the position p = of the measurement point.
[X, y, z] and the phase difference Δφ ₁₂ , Δφ ₁₃ , Δ
The relationship between φ ₁₄ , Δψ ₁₂ , Δψ ₁₃ , Δψ ₁₄ and the integer value biases k ₁₂ , k ₁₃ , k ₁₄ , l ₁₂ , l ₁₃ , l ₁₄ satisfy the following equations (23) to (28). It was obtained based on For example, equation (20) is derived from equations (23) and (26).

(Equation 8) Next, the positioning calculation unit 35 uses the integer-valued biases k ₁₂ , k ₁₃ , and k ₁₄ determined by the equations (20) to (22) to set p = satisfies the equations (23) to (25). [X, y,
z] is calculated and output as an estimation result of the position of the n-th measurement point.

The determination of the integer bias based on equations (20) to (22) in the third embodiment will be described with reference to FIG. FIG. 7 is a diagram illustrating an equal phase difference surface relating to two types of radio waves. In FIG. 7, the thick dotted line indicates the wavelength λ ₁
An equiphase difference surface of the phase difference [Delta] [phi ₁₂ according to the radio wave, which is given as a set of coordinates [x, y, z] that satisfies equation (23). The plurality of equal phase difference surfaces related to the phase difference Δφ ₁₂ are respectively associated with the corresponding integer value bias k ₁₂
Are different from each other. On the other hand, one-dot chain line is equal phase difference surface of the phase difference [Delta] [phi] ₁₂ of the electric wave wavelength lambda _2, which is given as a set of coordinates [x, y, z] that satisfies equation (26). A plurality of equal phase difference surface of the phase difference [Delta] [phi] ₁₂ is the integer bias l ₁₂ corresponding respectively are different from each other.

Radio transmitter 31_nAnd antenna 3₁Between
Distance and radio transmitter 31_nAnd antenna 3₂Distance between
Is constant regardless of the wavelength of the radio wave to be measured.
Therefore, as shown in FIG.
Radio transmitter 31 in the phase difference plane_nFaces that really exist
Match. That is, the integer bias k₁₂, L
₁₂Is uniquely determined.

[0045] As described above, according to the third embodiment, two types of a plurality of radio transmitters 31 _j to transmit respective two kinds of radio waves based on the carrier frequency, the two antennas for each carrier frequency and 3 _i phase difference detecting means for detecting a phase difference of the received radio wave at 34 a - 34 c ', equal phase difference surface of the two phase differences obtained for each carrier frequency in the combination of each of the two antennas 3 _i And the positioning calculation means 35 for estimating the position of the radio wave transmitter 31 _j by finding the intersection of the three determined equal phase difference surfaces, so that the combination of the two antennas 3 _i Since such an equal phase difference surface can be accurately derived, there is an effect that it is possible to prevent the deterioration of the positioning accuracy related to the position measurement of the measurement point.

In addition, since the positioning accuracy for measuring the position of the measurement point can be maintained at a high level, radio waves having a relatively short wavelength can be used, so that the position of the measurement point can be estimated with higher accuracy. It works.

Although the third embodiment uses radio waves of two different wavelengths, radio waves of different wavelengths can be used. In addition, the positioning calculation means 35 calculates Equations (20) to (20).
The integer value bias k ₁₂ determined by the equation (22),
Although the position of the n-th measurement point is calculated from Equations (23) to (25) using k ₁₃ and k ₁₄ , Equation (26) is used using integer value biases l ₁₂ , l ₁₃ , and l ₁₄ that can be determined simultaneously. )
The same effect can be obtained by calculating the n-th measurement point position from Expression (28). Further, the same effect can be obtained by directly obtaining the least-squares solution of Expressions (23) to (28).

Embodiment 4. In Embodiment 1, a plurality of
Radio transmitter 2 for simultaneous and independent positioning of measurement points
_jEach antenna 3_iReceived at
The received reception signal is passed through a band-pass filter 7._ijDiscriminate with
The phase difference was determined. On the other hand, in the fourth embodiment,
Wave transmitter 2_jUsing the difference in the modulation code of the transmitted signal
Each antenna 3 _iTo discriminate the received signal received by
Thus, a plurality of measurement points are measured simultaneously and independently.

The structure of the vibration displacement measuring device for structures according to the fourth embodiment is basically the same as that of the vibration displacement measuring device for structures according to the first embodiment shown in FIG. However, the radio wave transmitter 2 _j transmits a radio wave modulated respectively modulated mutually orthogonal codes of the pseudo-random sequence or the like. Further, in order to discriminate the reception signal received by each antenna 3 _i , a plurality of matched filters (demodulators) respectively corresponding to the modulation codes of the respective radio wave transmitters 2 _j are used instead of the band pass filters 7 _ij. Used.

As described above, according to the fourth embodiment, a plurality of radio transmitters provided at each measurement point and transmitting radio waves modulated by orthogonal modulation codes, respectively, are received by each antenna. And a matched filter provided to correspond to the modulation code of each radio transmitter for discriminating the received signal, so that the radio wave received by the antenna can be transmitted to each radio transmitter. Since the phase difference between the two antennas can be detected by discriminating the signals, the same effect as in the first embodiment can be obtained. Further, an effect that since it is configured to include a plurality of radio transmitters 2 _j that transmits signals that are modulated respectively modulated mutually orthogonal codes, it is possible to reduce the frequency bandwidth radio transmitter used .

Embodiment 5 In Embodiment 1, in order to simultaneously and independently measure a plurality of measurement points, a radio transmitter 2
_Using the difference in the transmission frequency of _j , the received signal received by each antenna 3 _i was discriminated by the band-pass filter 7 _ij to determine the phase difference. In contrast, by discriminating the reception signals received by utilizing a difference in transmission timing at each antenna 3 _i of the transmission signal in the form 5 in radio transmitter 2 _j of this embodiment, simultaneous and multiple measurement points Independent positioning.

The vibration displacement of the structure according to the fifth embodiment
The configuration of the measuring device is basically the same as that of the embodiment shown in FIG.
This is the same as the vibration displacement measuring device for a structure according to state 1. However
And a radio transmitter 2_jUse different transmission timings
Transmits the radio wave having. In addition, each antenna 3_iReceived by
Band pass filter 7 to discriminate the received signal
_ijInstead of each radio transmitter 2_jThe transmission timing for each
Using multiple switches that are turned on in synchronization with each other
You.

As described above, according to the fifth embodiment, a plurality of radio wave transmitters which are provided for each measurement point and transmit radio waves having different transmission timings, and the reception signals received by each antenna are A plurality of switches provided so as to conduct in synchronization with the transmission timing of each radio transmitter for discrimination are provided, so that the radio wave received by the antenna is transmitted to the signal of each radio transmitter. And the phase difference between the two antennas can be detected, and the same effect as in the first embodiment can be obtained. Further, an effect that since it is configured to include a plurality of radio transmitters 2 _j that transmits signals with different transmission timings from each other, it is possible to reduce the frequency bandwidth radio transmitter used.

Embodiment 6 In Embodiments 1 to 5, the position of the measurement point is obtained by using the phase difference of the received signal. The sixth embodiment differs from the first to fifth embodiments in that the position of the measurement point is obtained from the delay time difference of the received signal. FIG.
FIG. 13 is a configuration diagram illustrating a structure vibration displacement measuring apparatus according to Embodiment 6 of the present invention. 8, the same reference numerals as those in FIG. 1 denote the same or corresponding parts, and a description thereof will not be repeated. 41 _j (j = 1 to n: j is a transmitter number) are radio wave transmitters installed at each measurement point on the wall surface 1 and transmitting radio waves of modulated signals of different frequencies, 42 a, 42 b, 42
Each c antenna _{3 1} and the antenna _{3 2,} antenna 3
₁ and the antenna 3 _3, antenna 3 ₁ and the antenna 3 delay time difference detecting means for detecting the delay time difference of a radio wave from the measured same transmission sources at _4, 43 is a positioning means.

Next, the operation will be described. Embodiment 1
Similarly, the band-pass filter 7_ijBy the action of
Transmitter 41_jCan be processed independently
In the following, the position of the n-th measurement pointp= [X, y,
The operation will be described with the positioning processing for estimating z] as a representative.
Radio transmitter 41 installed at the n-th measurement point_nIs s (t) = ξ
_n(t) exp [j2π (f_c+ f_n) t]. However,
Modulated signal ξ_nThe bandwidth of (t) is the bandpass filter 7 _ij
Below the pass bandwidth. Bandpass filter 7_1n, 7
_2nReceived signal r 'output from_{n, 1}And received signal
r ’_{n, 2}Are as follows.

(Equation 9) Here, τ1 and τ2 are delay times represented by the following equations. tau ₁ = ‖ p - q ₁ ‖ / c (31) τ ₂ = ‖ p - q ₂ ‖ / c (32) a delay time difference detecting means 42a is, the received signal r '
The correlation function between _{n, 1} (t) and r ′ _{n, 2} (t) is given by the equation (3)
The delay time difference Δτ ₁₂ ≡τ ₁ −τ ₂ is measured by obtaining the peak position of the correlation function, as shown in 3).

(Equation 10)

The positioning calculation means 43 calculates the delay time difference Δ obtained by the delay time difference detection means 42a, 42b, 42c.
τ ₁₂ , Δτ ₁₃ , Δτ ₁₄ are input and the following equation (3)
4) Calculate p = [x, y, z] that satisfies Expression (36), and output this as the estimation result of the n-th measurement point position.

[Equation 11] Also in this case, similarly to the first embodiment, Expressions (34) to (3)
The position of the n-th measurement point is derived by obtaining the intersection of the three equal delay time difference surfaces respectively given as paraboloids according to 6).

As described above, according to the sixth embodiment, a plurality of radio transmitters 41 installed at each measurement point on wall surface 1 and transmitting radio waves of modulated signals of different frequencies are provided.
and _j, each of the two antennas 3 _i delay time difference detecting means for detecting the delay time difference of the radio wave from the same transmission source received in according to combination (42a, 42b, 42c) so configured to include an antenna Can be discriminated into signals for each of the radio transmitters and the delay time difference between the two antennas can be detected.
The same effect can be obtained.

In the sixth embodiment, the antenna 3 _i is determined based on the different transmission frequency for each radio transmitter 41 _j.
The signals received at the measurement points are discriminated into signals at each measurement point and measured. However, the present embodiment is not limited to such an aspect, and as shown in Embodiments 4 and 5, a received signal is discriminated and measured using a radio wave modulation code or a radio wave transmission timing. The same effect can be obtained even if it is configured to perform the above. further,
As in the second embodiment, the delay time difference can be calibrated using a reception signal from a radio wave transmitter installed at a known position.

[0059]

As described above, according to the present invention, a plurality of radio transmitters provided for each measurement point and transmitting radio waves having different frequencies, a plurality of antennas arranged at different positions from each other, Provided for each antenna,
A plurality of band-pass filters for discriminating a signal received by each antenna into a signal of a corresponding frequency band for each radio transmitter, and radio transmission of at least three different combinations of two antennas among the plurality of antennas. For each radio wave of a different frequency transmitted from the transmitter, a phase difference detecting means for detecting the phase difference of the received radio wave between the two antennas of each combination, and for each radio wave of a different frequency transmitted from the radio transmitter. Positioning calculation means for determining intersections of at least three equal phase difference planes respectively derived from phase differences of at least three different combinations of two antennas and estimating a position of a radio wave transmitter transmitting a radio wave of the frequency So that even if the measurement points are distributed over a wide range, transmission from radio transmitters for all measurement points Radio wave received by the antenna, and the position of the radio wave transmitter can be independently calculated for each radio wave transmitted from each radio wave transmitter based on the phase difference between the antennas. This has the effect that the position of each measurement point in a wide measurement range can be simultaneously and independently estimated. In addition, since the position of the measurement point is obtained from the phase difference of the radio wave, the position can be estimated with high accuracy with a precision of several tenths to several tenths of the wavelength of the radio wave. . In addition, since measurement is performed using radio waves, the measurement is not affected by the surrounding lighting environment, so that there is an effect that sufficient measurement accuracy can be obtained even in a dark room or outdoors at night. Furthermore, since the position of the measurement point is calculated from the phase difference of the received signal, the restriction on the waveform of the transmitted radio wave is reduced, and a radio transmitter having a simple structure can be used. And the like can be observed with high accuracy at low cost.

According to the present invention, the positioning calculation means stores the transmission phase difference correction amount for correcting the phase difference error of the combination of the two antennas caused by the transmission phase error on the path of the receiver. Since the correction amount storage unit is provided, the phase difference obtained from the phase difference detection means is corrected, and the position of the measurement point is calculated based on the accurate phase difference. This has the effect of preventing the deterioration of the device.

According to the present invention, since the radio transmitter is provided at a known position, it is not necessary to measure the position of the radio transmitter using another measuring means such as a laser. There is an effect that the configuration can be simplified.

According to the present invention, provided for each measurement point,
A plurality of radio transmitters for transmitting radio waves of two kinds of frequencies by applying two kinds of carrier frequencies to the individual frequency bands to which each is assigned, and a plurality of antennas for each carrier frequency as a unit. For at least three different combinations of the two antennas, for each radio wave of a different frequency transmitted from the radio transmitter, phase difference detection for detecting the phase difference of the received radio waves between the two antennas of each combination Means, and for each radio wave transmitter, an equiphase difference plane for each combination is determined from two phase differences obtained for each carrier frequency for each combination of the two antennas, and at least the determined Since it is configured to include an intersection of three phase difference planes and a position calculating means for estimating the position of the radio wave transmitter, Since Michibikeru the equal phase differences surface of the combination of the antenna accurately, an effect that the degradation of the positioning accuracy of the position measurement of the measurement points can be prevented. Further, since the positioning accuracy related to the measurement of the position of the measurement point can be maintained at a high level, it is possible to use a radio wave having a relatively short wavelength, and it is possible to estimate the position of the measurement point with higher accuracy.

According to the present invention, a plurality of radio transmitters are provided for each measurement point and transmit radio waves modulated respectively by orthogonal modulation codes, and a plurality of radio transmitters are provided for each antenna. Since it is configured to include a plurality of matched filters each capable of corresponding to a modulation code of each radio transmitter so as to discriminate the received signal for each signal transmitted from the radio transmitter, the received signal is received by the antenna. The radio waves are discriminated into signals for each radio transmitter, and the phase difference between the two antennas according to each combination can be detected. Therefore, the positions of the measurement points in a wide measurement range of the structure can be simultaneously and independently determined. And the like. In addition, since a plurality of radio transmitters for transmitting radio waves modulated by orthogonal modulation codes are provided, the frequency bandwidth used by the radio transmitter can be reduced.

According to the present invention, a plurality of radio wave transmitters provided for each measurement point and transmitting radio waves having mutually different transmission timings, and a signal provided for each antenna and received by each antenna And a plurality of switches that are turned on in synchronization with the transmission timing of each radio transmitter so as to discriminate each signal transmitted from the radio transmitter. Since the phase difference between the two antennas according to each combination can be detected by discriminating the signal for each radio transmitter, the position of each measurement point in a wide measurement range for the structure is simultaneously and independently estimated. It has effects such as being able to do. In addition, since a plurality of radio transmitters for transmitting radio waves having different transmission timings from each other are provided, there is an effect that the frequency bandwidth used by the radio transmitter can be reduced.

According to the present invention, a plurality of radio transmitters provided for each measurement point for transmitting radio waves having different frequencies, a plurality of antennas arranged at different positions from each other,
A plurality of band-pass filters are provided for each antenna and discriminate signals received by each antenna into signals in a corresponding frequency band for each radio wave transmitter, and two of the plurality of antennas For at least three different combinations, for each radio wave of a different frequency transmitted from the radio transmitter, 2
A delay time difference detecting means for detecting a delay time difference of a received radio wave between the two antennas;
And a positioning calculation means for obtaining an intersection of at least three equal delay time difference planes respectively derived from the delay time differences of the three different combinations and estimating a position of a radio wave transmitter transmitting a radio wave of the frequency. Even if the measurement points are distributed over a wide area, the antennas receive the radio waves transmitted from the radio transmitters related to all the measurement points, and the delay time difference between the antennas for each radio wave transmitted from each radio transmitter is calculated. Since the position of the radio transmitter can be independently calculated based on the base, there is an effect that the position of each measurement point in a wide measurement range of the structure can be simultaneously and independently estimated.

According to the present invention, a plurality of radio transmitters are provided for each measurement point and transmit radio waves modulated respectively by orthogonal modulation codes, and a plurality of radio transmitters are provided for each antenna. Since it is configured to include a plurality of matched filters each capable of corresponding to a modulation code of each radio transmitter so as to discriminate the received signal for each signal transmitted from the radio transmitter, the received signal is received by the antenna. Radio signals can be discriminated into signals for each radio transmitter, and the delay time difference between the two antennas according to each combination can be detected. Therefore, the positions of the measurement points in a wide measurement range of the structure can be simultaneously and independently determined. And the like.

According to the present invention, a plurality of radio wave transmitters provided for each measurement point and transmitting radio waves having different transmission timings, and a plurality of radio wave transmitters provided for each antenna and received by each antenna And a plurality of switches that are turned on in synchronization with the transmission timing of each radio transmitter so as to discriminate each signal transmitted from the radio transmitter. Since the delay time difference between the two antennas according to each combination can be detected by discriminating the signal for each radio wave transmitter, the position of each measurement point in a wide measurement range of the structure is simultaneously and independently estimated. It has effects such as being able to do.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a structure vibration displacement measuring apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating an equal phase difference surface related to radio waves received by two antennas.

FIG. 3 is a diagram showing an intersecting state of two types of equal phase difference surfaces.

FIG. 4 is a flowchart showing a process of deriving a transmitter position using the structure vibration displacement measuring device according to the second embodiment of the present invention.

FIG. 5 is a configuration diagram illustrating a vibration displacement measuring device for a structure according to a modification of the second embodiment of the present invention.

FIG. 6 is a configuration diagram showing an apparatus for measuring a vibration displacement of a structure according to a third embodiment of the present invention.

FIG. 7 is a diagram illustrating an equal phase difference surface relating to two types of radio waves.

FIG. 8 is a configuration diagram illustrating an apparatus for measuring a vibration displacement of a structure according to a sixth embodiment of the present invention.

FIG. 9 is a schematic diagram showing an example of a conventional apparatus for measuring vibration displacement of a structure.

[Description of Signs] 1 wall surface, 2 _j (j = 1 to n), 20, 31 _j (j = 1
To n), 41 _j (j = 1 to n) radio transmitter, 3 _i (i
= 1 to 4) Antenna, 4,33 ₁ , 33 ₂ local oscillator, 5 _i (i = 1 to 4) down converter, 6 _i (i
= 1 to 4) A / D converter, 7 _ij (i = 1 to 4, j =
1-n) band pass filters, 8a, 8b, 8c, 34
a, 34b, 34c, 34a ', 34b', 34c '
Phase difference detecting means, 9, 35, 43 positioning calculating means, 10
Display means, 32 ₁ , 32 ₂ distributors, 42a, 42
b, 42c Delay time difference detecting means.

Claims (9)

[Claims] 1. A plurality of radio transmitters provided for each measurement point for transmitting radio waves of different frequencies, a plurality of antennas arranged at different positions, provided for each of the antennas, A plurality of bandpass filters for discriminating a signal received by the antenna into a signal of a corresponding frequency band for each of the radio transmitters; and at least three different combinations of two of the plurality of antennas. A phase difference detecting unit for detecting a phase difference of a received radio wave between the two antennas according to each combination for each radio wave of a different frequency transmitted from the radio wave transmitter; For each radio wave of different frequency, each is derived from the phase difference for at least three different combinations of the two antennas. Seeking at least three intersections equiphase difference plane, vibration displacement measuring apparatus of the structure, characterized in that a positioning calculation means for estimating the position of a radio wave transmitter for transmitting a radio wave of the frequency. 2. A phase difference correction amount storage for storing a transmission phase difference correction amount for correcting a phase difference error of a combination of two antennas caused by a transmission phase error relating to a path of a receiver. The vibration displacement measuring device for a structure according to claim 1, further comprising a part. 3. The apparatus according to claim 2, further comprising a radio transmitter arranged at a known position. 4. A plurality of radio transmitters provided for each measurement point and transmitting radio waves of two different frequencies by applying two types of carrier frequencies to individual frequencies assigned to the respective measurement points; A plurality of antennas arranged at different positions from each other, and each carrier frequency is provided as a unit, provided for each of the antennas, and a signal received by each of the antennas is transmitted in a separate frequency band for each of the radio transmitters. A plurality of band-pass filters for discriminating signals, and radio waves of different frequencies transmitted from the radio transmitter for at least three different combinations of two of the plurality of antennas in units of each carrier frequency. 2 for each combination
Phase difference detecting means for detecting a phase difference of a received radio wave between the two antennas, and for each of the radio wave transmitters, two combinations determined for each combination of the two antennas for each carrier frequency.
Positioning calculation means for determining an equal phase difference plane relating to each combination from the two phase differences, obtaining an intersection of the determined at least three phase difference planes, and estimating the position of the radio wave transmitter. A vibration displacement measuring device for a structure characterized by the following. 5. A plurality of radio transmitters provided at each measurement point for transmitting radio waves modulated by orthogonal modulation codes, a plurality of antennas arranged at different positions from each other, Are provided, a plurality of matched filters capable of respectively corresponding to the modulation code for each radio transmitter so as to discriminate the signal received by each antenna for each signal transmitted from the radio transmitter For at least three different combinations of the two antennas among the plurality of antennas, for each radio wave modulated with a different modulation code transmitted from the radio wave transmitter, the two antennas of the respective combinations are Phase difference detecting means for detecting the phase difference of the received radio wave, and modulated with a different modulation code transmitted from the radio wave transmitter For each radio wave transmitted, an intersection of at least three equal phase difference planes respectively derived from the phase differences of at least three different combinations of the two antennas is obtained, and the radio wave transmitted by the modulation code is transmitted. An apparatus for measuring the vibration displacement of a structure, comprising: a positioning calculation means for estimating the position of the aircraft. 6. A plurality of radio wave transmitters provided for each measurement point for transmitting radio waves having different transmission timings, a plurality of antennas arranged at different positions from each other, and provided for each of said antennas A plurality of switches that are turned on in synchronization with the transmission timing of each of the radio transmitters so as to discriminate the signal received by each of the antennas for each signal transmitted from the radio transmitter, For at least three different combinations of the two antennas among the antennas, for each of the radio waves having different transmission timings transmitted from the radio wave transmitter, the reception radio waves between the two antennas of the respective combinations are Phase difference detecting means for detecting a phase difference; In each case, the intersection of at least three equal phase difference planes respectively derived from the phase differences of at least three different combinations of the two antennas is obtained, and the position of the radio wave transmitter transmitting the radio wave having the transmission timing is determined. An apparatus for measuring a vibration displacement of a structure, comprising: a positioning calculation means for estimating the vibration. 7. A plurality of radio transmitters provided at each measurement point for transmitting radio waves of different frequencies, a plurality of antennas arranged at different positions, provided for each of said antennas, A plurality of bandpass filters for discriminating a signal received by the antenna into a signal of a corresponding frequency band for each of the radio transmitters; and at least three different combinations of two of the plurality of antennas. A delay time difference detecting unit that detects a delay time difference of a received radio wave between the two antennas according to each combination for each radio wave of a different frequency transmitted from the radio wave transmitter, and transmitted from the radio wave transmitter. For each radio wave of a different frequency, the difference between the delay times for at least three different combinations of the two antennas is calculated. And a position calculating means for estimating a position of an electric wave transmitter for transmitting an electric wave of the frequency by finding an intersection of at least three equal delay time difference planes respectively guided. apparatus. 8. A plurality of radio transmitters provided at each measurement point for transmitting radio waves modulated by modulation codes orthogonal to each other, a plurality of antennas arranged at different positions from each other; Are provided, a plurality of matched filters capable of respectively corresponding to the modulation code for each radio transmitter so as to discriminate the signal received by each antenna for each signal transmitted from the radio transmitter For at least three different combinations of the two antennas among the plurality of antennas, for each radio wave modulated with a different modulation code transmitted from the radio wave transmitter, the two antennas of the respective combinations are A delay time difference detecting means for detecting a delay time difference between received radio waves, and a different modulation code transmitted from the radio wave transmitter. For each modulated radio wave, determine the intersection of at least three equal delay time difference planes derived from the delay time differences for at least three different combinations of the two antennas, and transmit the radio wave modulated with the modulation code. An apparatus for measuring vibration displacement of a structure, comprising: a positioning calculation means for estimating a position of a radio transmitter. 9. A plurality of radio transmitters provided for each measurement point and transmitting radio waves having different transmission timings, a plurality of antennas arranged at different positions from each other, and provided for each of said antennas A plurality of switches that are turned on in synchronization with the transmission timing of each of the radio transmitters so as to discriminate the signal received by each of the antennas for each signal transmitted from the radio transmitter, For at least three different combinations of the two antennas among the antennas, for each of the radio waves having different transmission timings transmitted from the radio wave transmitter, the reception radio waves between the two antennas of the respective combinations are Delay time difference detecting means for detecting a delay time difference, and different transmission timings transmitted from the radio wave transmitter. For each radio wave to be transmitted, an intersection of at least three equal delay time difference planes respectively derived from delay time differences of at least three different combinations of the two antennas is obtained, and a radio transmitter for transmitting a radio wave having the transmission timing is obtained. A vibration displacement measuring device for a structure, comprising: a position calculating means for estimating a position.