CN106998587B - Method and device for identifying legal viewing area and comprehensive receiving decoder - Google Patents

Abstract

The invention provides a method and a device for identifying a legal viewing area and a comprehensive receiving decoder, which solve the problems of low positioning precision and small use range of the existing method for positioning whether the comprehensive receiving decoder is in the legal viewing area through General Packet Radio Service (GPRS). The method of the invention comprises the following steps: determining the current position information of the comprehensive receiving decoder according to the navigation information of the navigation satellite; and identifying whether the comprehensive receiving decoder is in a legal viewing area or not according to the current position information of the comprehensive receiving decoder and the pre-stored preset viewing range information, and controlling the comprehensive receiving decoder to stop receiving the video program information when the comprehensive receiving decoder is out of the legal viewing area. The technical scheme can be adopted in all the embodiments of the invention for observing the ground area of the navigation satellite, has wide application range, and has high positioning precision for positioning the comprehensive receiving decoder according to the navigation satellite.

Description

A method and device for identifying a legal viewing area and an integrated receiver and decoder

technical field

The present invention relates to the technical field of navigation satellite positioning, in particular to a method, a device and an integrated receiver and decoder for identifying a legal viewing area.

Background technique

According to the application requirements of my country's satellite TV broadcast system, satellite TV broadcast programs are provided in rural areas where cable networks are not accessible. The role of the integrated receiver decoder is to receive satellite broadcast signals and broadcast free video programs for legal viewing areas. In addition to the video broadcast function, the integrated receiver decoder also needs to be able to automatically identify whether the local device is in a legal viewing area. However, the existing method of locating whether the integrated receiver and decoder is in a legal viewing area by using the General Packet Radio Service (GPRS) technology has low positioning accuracy, small use range, and low security of the equipment, and is easy to be cracked.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a method for identifying a legal viewing area, a device and an integrated receiver decoder, so as to solve the existing method for locating whether the integrated receiver decoder is in a legal viewing area through the general packet wireless service GPRS, and the positioning accuracy is low, Use a small problem.

In order to achieve the above object, the present invention provides a method for identifying a legal viewing area, which is applied to an integrated receiver decoder, including:

According to the navigation information of the navigation satellite, determine the current position information of the integrated receiver and decoder;

According to the current location information of the comprehensive receiver decoder and the pre-stored preset viewing range information, it is identified whether the comprehensive receiver decoder is in the legal viewing area, and if the comprehensive receiver decoder is in the legal viewing area When outside, control the integrated receiver decoder to stop receiving video program information.

Wherein, determining the current location information of the integrated receiver and decoder according to the navigation information of the navigation satellites includes:

According to the ephemeris information of the navigation satellite, determine the coordinate information of the navigation satellite in the earth-centered coordinate system;

Determine the coordinate information of the integrated receiver and decoder according to the coordinate information of at least four of the navigation satellites in the earth-centered coordinate system and the GNSS pseudo-range information of the global navigation satellite system;

According to the coordinate information of the integrated receiving decoder, the current location information of the integrated receiving decoder is determined, and the location information includes longitude and latitude information of the current location of the integrated receiving decoder.

Wherein, identifying whether the integrated receiver decoder is in a legal viewing area according to the current location information of the integrated receiver decoder and pre-stored preset viewing range information includes:

Judging whether the latitude and longitude of the current location of the integrated receiver decoder is within a preset viewing range, and the preset viewing range is a range represented by latitude and longitude coordinates;

If the latitude and longitude of the current location of the integrated reception decoder is within the preset viewing range, it is identified that the integrated reception decoder is within the legal viewing area; otherwise, it is identified that the integrated reception decoder is in the outside the legal viewing area.

Wherein, after determining the current location information of the integrated receiver decoder according to the coordinate information of the integrated receiver decoder, the identification method further includes:

According to the coordinate information of the navigation satellite and the coordinate information of the integrated receiver decoder, the pitch angle and azimuth angle information between the integrated receiver decoder and the navigation satellite are obtained.

Wherein, identifying whether the integrated receiver decoder is in a legal viewing area according to the current location information of the integrated receiver decoder and pre-stored preset viewing range information includes:

Determine whether the pitch angle between the integrated receiver decoder and the navigation satellite is within the preset pitch angle range, and determine whether the azimuth angle between the integrated receiver decoder and the navigation satellite is within the preset azimuth angle The preset viewing range information includes a preset pitch angle range and a preset azimuth angle range;

If the pitch angle between the integrated receiver decoder and the navigation satellite is within the preset pitch angle range, and the azimuth angle between the integrated receiver decoder and the navigation satellite is within the preset azimuth Within the angular range, it is identified that the integrated receiver decoder is within the legal viewing area, otherwise, it is identified that the integrated receiver decoder is outside the legal viewing area.

Wherein, according to the coordinate information of the navigation satellite and the coordinate information of the integrated receiver decoder, the pitch angle and azimuth angle information between the integrated receiver decoder and the navigation satellite are obtained, which specifically includes:

According to the coordinate information of the integrated receiver decoder, the coordinates of the integrated receiver decoder are converted into space rectangular coordinates;

Convert the coordinates of the navigation satellite in the earth-centered coordinate system into the coordinates of the site centered on the integrated receiver and decoder according to the space rectangular coordinates of the integrated receiver and decoder;

converting the site coordinates of the navigation satellite into site polar coordinates;

According to the polar coordinates of the site, the pitch angle and azimuth angle information between the integrated receiver decoder and the navigation position are obtained.

The present invention also provides a device for identifying a legal viewing area, which is applied to an integrated receiver and decoder, including:

a determining module, used for determining the current position information of the integrated receiver decoder according to the navigation information of the navigation satellite;

The processing module is used to identify whether the integrated receiver decoder is in a legal viewing area according to the current position information of the integrated receiver decoder and the pre-stored preset viewing range information, and the integrated receiver decoder When it is outside the legal viewing area, the integrated receiver decoder is controlled to stop receiving video program information.

Wherein, the determining module includes:

a first determination submodule, configured to determine the coordinate information of the navigation satellite in the earth-centered coordinate system according to the ephemeris information of the navigation satellite;

The second determination submodule is used to determine the coordinate information of the integrated receiver decoder according to the coordinate information of at least four of the navigation satellites in the earth-centered coordinate system and the GNSS pseudorange information of the global navigation satellite system;

The third determination sub-module is configured to determine the current position information of the integrated receiver decoder according to the coordinate information of the integrated receiver decoder, where the position information includes the latitude and longitude information of the current position of the integrated receiver decoder.

Wherein, the processing module includes:

a first judging submodule for judging whether the latitude and longitude of the current location of the integrated receiving decoder is within a preset viewing range, and the preset viewing range is a range represented by latitude and longitude coordinates;

The first processing sub-module is configured to identify that the integrated receiving decoder is in the legal viewing area if the latitude and longitude of the current location of the integrated receiving decoder is within the preset viewing range, otherwise, identify that the integrated receiving decoder is within the legal viewing area. The integrated reception decoder is outside the legal viewing area.

Wherein, the identification device of the above-mentioned legal viewing area, the determining module further includes:

The fourth determination sub-module is used for the third determination sub-module to determine the current position information of the integrated receiver and decoder according to the coordinate information of the integrated receiver and decoder, and then according to the coordinate information of the navigation satellite and the integrated receiver. The coordinate information of the decoder is used to obtain the pitch angle and azimuth angle information between the integrated receiver decoder and the navigation satellite.

Wherein, the processing module includes:

The second judging sub-module is used to judge whether the pitch angle between the integrated receiver decoder and the navigation satellite is within a preset pitch angle range, and to judge whether the pitch angle between the integrated receiver decoder and the navigation satellite is within the range of the preset pitch angle. Whether the azimuth angle is within a preset azimuth angle range, the preset viewing range information includes a preset pitch angle range and a preset azimuth angle range;

The second processing sub-module is used for if the pitch angle between the integrated receiver decoder and the navigation satellite is within the preset pitch angle range, and the distance between the integrated receiver decoder and the navigation satellite is within the range of the preset pitch angle. If the azimuth angle is within the preset azimuth angle range, it is recognized that the integrated reception decoder is within the legal viewing area; otherwise, it is identified that the integrated receiving decoder is outside the legal viewing area.

Wherein, the fourth determination sub-module specifically includes:

a first conversion unit, configured to convert the coordinates of the integrated reception decoder into space Cartesian coordinates according to the coordinate information of the integrated reception decoder;

a second conversion unit, configured to convert the coordinates of the navigation satellite in the earth-centered coordinate system into site coordinates centered on the integrated receiver and decoder according to the space rectangular coordinates of the integrated receiver and decoder;

a third conversion unit, configured to convert the site coordinates of the navigation satellite into site polar coordinates;

and a determining unit, configured to obtain the pitch angle and azimuth angle information between the integrated receiver decoder and the navigation position according to the polar coordinates of the site.

The present invention also provides an integrated receiver decoder, which includes the above-mentioned device for identifying a legal viewing area.

The embodiment of the present invention has the following beneficial effects:

In the above technical solution of the embodiment of the present invention, according to the navigation information of the navigation satellite, the current position information of the integrated receiver decoder is determined; according to the current position information of the integrated receiver decoder and the pre-stored preset viewing range information, Identifying whether the integrated reception decoder is within the legal viewing area, and controlling the integrated reception decoder to stop receiving video program information when the integrated reception decoder is outside the legal viewing area. In the embodiment of the present invention, any ground area where the navigation satellite can be observed can adopt the above technical solution, which has a wide range of applications, and at the same time, the positioning of the integrated receiver and decoder according to the navigation satellite has high positioning accuracy.

Description of drawings

Fig. 1 is the first work flow chart of the identification method of the legal viewing area of the embodiment of the present invention;

2 is a second work flow diagram of the method for identifying a legitimate viewing area according to an embodiment of the present invention;

FIG. 3 is a structural block diagram of an apparatus for identifying a legal viewing area according to an embodiment of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, detailed description will be given below in conjunction with specific embodiments and accompanying drawings.

The embodiments of the present invention provide a method, a device and an integrated receiver decoder for identifying a legal viewing area, which solves the problem of the existing method of locating whether the integrated receiver decoder is in a legal viewing area through the general packet wireless service (GPRS), and the positioning accuracy is low. Use a small problem.

As shown in FIG. 1 , the method for identifying a legitimate viewing area according to an embodiment of the present invention is applied to an integrated receiver decoder, and the identifying method includes:

Step 11: Determine the current position information of the integrated receiver decoder according to the navigation information of the navigation satellite.

Here, the navigation information of the navigation satellite may specifically include global navigation satellite system (global navigation satellite system, GNSS) broadcast ephemeris information, GNSS pseudorange information, and the like. The current location information of the integrated receiver and decoder may specifically be the longitude and latitude information of the integrated receiver and decoder.

The current position information of the integrated receiver and decoder is determined by the navigation information of the navigation satellite, which has high positioning accuracy. According to the navigation principle, the positioning accuracy can reach the meter level.

Step 12: According to the current location information of the integrated receiver decoder and the pre-stored preset viewing range information, identify whether the integrated receiver decoder is in a legal viewing area, and if the integrated receiver decoder is in a legal viewing area. When it is outside the viewing area, the integrated reception decoder is controlled to stop receiving video program information.

In a specific embodiment of the present invention, after determining the current position information of the comprehensive receiver decoder, the position information is compared with the pre-stored preset viewing range information, and it is determined whether the comprehensive receiver decoder is in the legal viewing area. , and when the integrated receiver decoder is in the legal viewing area, the integrated receiver decoder can be used normally, and when the integrated receiver decoder is outside the legal viewing area, the integrated receiver decoder is controlled to stop receiving video program information.

In the above technical solution of the embodiment of the present invention, according to the navigation information of the navigation satellite, the current position information of the integrated receiver decoder is determined; according to the current position information of the integrated receiver decoder and the pre-stored preset viewing range information, Identifying whether the integrated reception decoder is within the legal viewing area, and controlling the integrated reception decoder to stop receiving video program information when the integrated reception decoder is outside the legal viewing area. In the embodiment of the present invention, any ground area where the navigation satellite can be observed can adopt the above technical solution, which has a wide range of applications, and at the same time, the positioning of the integrated receiver and decoder according to the navigation satellite has high positioning accuracy.

Further, as shown in FIG. 2 , the above step 11 may specifically include:

Step 111: Determine the coordinate information of the navigation satellite in the earth-centered coordinate system according to the ephemeris information of the navigation satellite.

Step 112: Determine the coordinate information of the integrated receiver and decoder according to the coordinate information of the at least four navigation satellites in the earth-centered coordinate system and the GNSS pseudo-range information of the global navigation satellite system.

Step 113 : According to the coordinate information of the integrated receiving decoder, determine the current location information of the integrated receiving decoder, where the location information includes longitude and latitude information of the current location of the integrated receiving decoder.

In a specific embodiment of the present invention, according to the principle of navigation and positioning, when the integrated receiver-decoder receives four or more pieces of navigation information, it can lock its own latitude and longitude position. Specifically, GNSS users can obtain 16 satellite ephemeris parameters through satellite broadcast ephemeris, including 1 reference time, 6 Kepler orbit parameters corresponding to the reference time, and 9 parameters affected by perturbation force. The definitions of these parameters are shown in Table 1:

Table 1

Among them, AODE represents the extrapolation time interval of extrapolated ephemeris 0 from the last injection message, which reflects the reliability of the extrapolated ephemeris. According to the above data, the orbital parameters at the observation time t can be extrapolated to calculate the corresponding coordinates of the satellite in different reference systems.

When using GNSS signals for navigation and positioning, in order to calculate the user's position in the geocentric coordinate system, the GNSS receiver needs to measure the distance from the observation station to the satellite and know the geocentric coordinates of the same satellite at the same time. The geocentric coordinates of the satellite are calculated according to a certain formula from the Kepler orbital parameters and orbital perturbation corrections provided in the satellite's navigation message.

1) Calculate the average angular velocity n of the satellite operation:

The average angular velocity n ₀ of the satellite is calculated by the following formula:

In the formula, GM=398600.5(km) ³ /s ² is the gravitational constant of the earth in the WGS-84 coordinate system.

Using the perturbation correction number Δn given in the navigation message, the average angular velocity n of the satellite is calculated by the following formula:

n=n ₀ +Δn (2)

2) Correct the satellite clock error for the observation time t':

t=t'-Δt

Δt=a ₀ +a ₁ (tt _0e )+a ₂ (tt _0e ) ² (3)

When calculating the correction of satellite clock error Δt, t can be approximated as t'.

3) Calculation of the near point angle M _s at the time of observation:

M _s =M ₀ +n(tt _0e ) (4)

4) Calculate the near point angle E _s :

E _s =M _s +es _{sinE s (} 5)

Equation (5) can be calculated by the iterative method, that is, _{let Es =M s be} substituted into the above formula, find out _Es and then substitute it into the above formula for calculation, since the eccentricity e is very small (only 0.01), the convergence is very fast, and only need The partial near point angle can be found in two iterations.

5) Calculation of true near point angle:

∵cosf _s =(cosE _s -e _s )/(1-e _s cosE _s )

∴

6) Calculate the ascending angle distance u ₀ and the orbit perturbation correction term:

Ascending angle distance:

u ₀ =ω ₀ +f _s

Perturbation correction term:

δ _u =cus sin2u ₀ +c _{uc cos2u 0}

δ _r =c _rs sin2u ₀ +c _rc cos2u ₀ (7)

δ _i =c _is sin2u ₀ +c _ic cos2u ₀

7) Calculate the perturbation-corrected ascending angle distance u, satellite-to-earth center distance r, orbit inclination i

u=u ₀ +δ _u

r=as (1-e _{s cosE s )} +δ _r (8)

i=i ₀ +δ _i +i(tt _0e )

8) Calculate the coordinates in the satellite orbit plane coordinate system:

The coordinates of the satellite in the orbital plane coordinate system are

x=rcosu

y=rsinu (9)

9) Calculate the longitude of the ascending node at the time of observation:

The ascending node longitude λ is the difference between the ascending node right ascension Ω and the Greenwich sidereal time GAST at that moment, namely

λ=Ω-GAST (10)

The ascending node right ascension Ω at the observation time is the ascending node right ascension Ω _0e of the reference epoch t _0e plus the right ascension change of the ascending node between the observation time and the reference epoch, namely

In addition, the satellite message provides the Greenwich sidereal time GATS(t ₀ ) in seconds at the start of the week (Saturday midnight). GAST is also increasing due to the rotation of the Earth. The increase is related to the earth's rotation rate We _e = _7.29211567 ×10 ^-5 rad/s. Therefore, the observation time GAST is calculated by the following formula:

GAST=GAST(t ₀ )+W _e (tt ₀ ) (12)

Considering equations (11) and (12), then

Because Ω ₀ =Ω _{0e -GAST} (t ₀ )

Considering that both t and t _0e are counted from t ₀ , that is, t ₀ =0, equation (13) is

10) Calculate the space rectangular coordinates of the satellite in the geocentric coordinate system:

11) If the influence of polar motion is considered, the space rectangular coordinates in the agreement earth coordinate system can be obtained:

From the above formula, the space rectangular coordinate position of the satellite can be determined first, that is, the satellite position.

Next, the position of the integrated receiver decoder is determined using the satellite position and pseudorange information.

Since the receiver measures the pseudorange, there is a receiver clock difference in the observation value, and the three-dimensional coordinates of the measurement point are to be evaluated, so there are a total of 4 unknowns. To solve these 4 unknowns, there must be 4 equations. For this reason, to achieve single-point absolute positioning, four satellites must be observed at the same time to form the basic equation of positioning.

Let ρ be the pseudorange observation amount, R be the true distance from the receiver to the satellite, and τ be the receiver clock error, then the observation equation is

In the formula, it is assumed that the pseudo-range observation ρ has been corrected by the troposphere and ionosphere in the ephemeris; (X _s , Y _s , Z _s ) are the instantaneous geocentric coordinates of the satellite, which can be obtained from the satellite ephemeris text; (X s , Y s , Z s ) _p , Y _p , Z _p ) are the geocentric coordinates of the receiver and are the quantities to be determined.

For the convenience of solving and the need of data processing, formula (17) is differentiated and linearized, and the rough coordinates (X _p0 , Y _p0 , Z _p0 ) of the receiver are substituted as initial values, and we get

In the formula, dt=cdτ is the spatial distance corresponding to the receiver clock error,

It can be seen from equation (18) that the coefficients of the three coordinate components are the directional cosines of the projection of the unit vector radius from the receiver to the satellite to the three coordinate axes respectively. use notation

It is stipulated that the superscript is the satellite number, and the subscript i is the station number, which constitutes the basic equation of pseudorange positioning.

represented by a matrix

观测量

Observational amount

状态矩阵

state matrix

X _i =[dX _i dY _i dZ _i dt] ^T unknown

The formula (20) becomes

A _i X _i -l _i =0 (21)

Solving equation (21), the unique solution of the geocentric coordinates of the integrated receiver-decoder is obtained.

X _i =A _i ^-1 l _i (22)

Further, in the above-mentioned step 12, according to the current location information of the integrated receiver decoder and the pre-stored preset viewing range information, it is identified whether the integrated receiver decoder is in the legal viewing area, including:

It is judged whether the latitude and longitude of the current location of the integrated receiving decoder is within a preset viewing range, and the preset viewing range is a range represented by the coordinates of the latitude and longitude.

If the latitude and longitude of the current location of the integrated reception decoder is within the preset viewing range, it is identified that the integrated reception decoder is within the legal viewing area; otherwise, it is identified that the integrated reception decoder is in the outside the legal viewing area.

In the embodiment of the present invention, the positioning module in the integrated receiver decoder can be specifically used to calculate the longitude and latitude information, and judge the legality of the locked position in real time, so as to control whether the integrated receiver decoder can normally receive video programs.

Further, after determining the current location information of the integrated receiver decoder according to the coordinate information of the integrated receiver decoder, the identification method further includes:

According to the coordinate information of the navigation satellite and the coordinate information of the integrated receiver decoder, the pitch angle and azimuth angle information between the integrated receiver decoder and the navigation satellite are obtained.

In a specific embodiment of the present invention, according to the coordinate information of the integrated receiving decoder, the coordinates of the integrated receiving decoder are converted into space rectangular coordinates; according to the spatial rectangular coordinates of the integrated receiving decoder, the The coordinates of the navigation satellites in the geocentric coordinate system are converted into site coordinates centered on the integrated receiver and decoder; the site coordinates of the navigation satellites are converted into site polar coordinates; according to the site polar coordinates, the Synthesize the pitch and azimuth information between the receiver decoder and the navigation position.

The specific implementation process for determining the pitch angle and the azimuth angle is specifically described below.

(1) Definition of pitch angle and azimuth angle

Pitch angle: the angle between the x-axis of the body coordinate system and the horizontal plane. When the x-axis of the body coordinate system is above the XOY plane of the inertial coordinate system, the pitch angle is positive, otherwise it is negative. Note: The body coordinate system and the inertial coordinate system are both right-handed coordinate systems.

Azimuth: From the north end of the standard direction, the horizontal angle clockwise to the line is called the azimuth of the line. The azimuth angle ranges from 0° to 360°.

(2) Calculation process of pitch angle and azimuth angle

According to the satellite position and the observation point position (the position of the integrated receiver and decoder) calculated according to the above scheme, the position coordinates of the two points are converted into the position of the observation point as the origin, the elevation angle on the horizontal plane of the observation point is positive, and the north direction of the horizontal plane is the azimuth angle. 0 point, the polar coordinate representation of the left-handed coordinate system formed, then the position of the satellite is uniquely determined in this coordinate system, expressed as (ρ, E, A) ie (slope distance, elevation angle, azimuth angle).

The conversion process is:

1. Convert the geodetic coordinates (B, L, H) P of the observation station to the space rectangular coordinates (X, Y, Z) P.

e ² =(a ² -b ² )/a ²

Among them: a, b are the semi-major and minor axes of the ellipsoid of the WSG-84 coordinate system

2. Convert the satellite's (X, Y, Z) S geocentric coordinates to the station center coordinates (X, Y, Z) S1 centered on the observation station

Station center coordinate system: take the survey point P as the origin, the discovery direction of point P is the axis (pointing to the zenith is positive), the axis points to the north direction of the tangent of the meridian passing through the point P, and the axis is perpendicular to the plane, forming a left-handed coordinate system.

where:

测站点P的空间直角坐标

Spatial Cartesian coordinates of station P

测站点P’(卫星)的空间直角坐标

Spatial Cartesian coordinates of station P' (satellite)

3. Another form of converting the satellite's station center coordinates (X, Y, Z) S1 to the station center coordinates - the station center polar coordinates

X=ρ*cosE*cosA

Y=ρ*sinE

Z=ρ*cosE*sinA

ρ=(X ² +Y ² +Z ² ) ^1/2

A=arctan(Z/Y)

E=arctan(Y/(X ² +Z ² ) ^1/2 )

In the formula, ρ is the slope distance;

A is the azimuth angle, ranging from 0° to 360°, with the X-axis as the starting side, measured in the clockwise direction (looking from the positive end of Y to the origin) in the OXZ plane;

E is the pitch angle, ranging from -90° to 90°, based on the OXZ plane, and upward is positive.

According to the above formula, the pitch angle and azimuth angle information between the integrated receiver decoder and the navigation position can be obtained.

Further, in the above-mentioned step 12, according to the current location information of the integrated receiver decoder and the pre-stored preset viewing range information, it is identified whether the integrated receiver decoder is in the legal viewing area, including:

Determine whether the pitch angle between the integrated receiver decoder and the navigation satellite is within the preset pitch angle range, and determine whether the azimuth angle between the integrated receiver decoder and the navigation satellite is within the preset azimuth angle The preset viewing range information includes a preset pitch angle range and a preset azimuth angle range.

The preset pitch angle range includes the legal range limit between the legal viewing area and the elevation angle of the navigation satellite, and the preset azimuth angle range includes the legal range limit between the legal viewing area and the azimuth angle of the navigation satellite. When the integrated receiver decoder is in the legal viewing area, its pitch angle and azimuth angle must fall within the legal range limit.

If the pitch angle between the integrated receiver decoder and the navigation satellite is within the preset pitch angle range, and the azimuth angle between the integrated receiver decoder and the navigation satellite is within the preset azimuth Within the angular range, it is identified that the integrated receiver decoder is within the legal viewing area, otherwise, it is identified that the integrated receiver decoder is outside the legal viewing area.

In this embodiment, the orbit parameter information in the navigation information is used to calculate the pitch angle and azimuth angle of the current satellite and the integrated receiver decoder in real time, and to judge the validity of the locked position in real time. Since the orbit parameters have time-varying characteristics, the calculated pitch angle and azimuth change with time, it is not easy to be calculated and tampered with, and has high security.

As shown in FIG. 3 , an embodiment of the present invention also provides a device for identifying a legal viewing area, which is applied to an integrated receiver and decoder, including:

The determining module 31 is used for determining the current position information of the integrated receiver decoder according to the navigation information of the navigation satellite;

The processing module 32 is used for identifying whether the integrated receiving decoder is in a legal viewing area according to the current location information of the integrated receiving decoder and the pre-stored preset viewing range information, and performing the integrated receiving and decoding in the integrated receiving and decoding When the receiver is outside the legal viewing area, the integrated receiver decoder is controlled to stop receiving video program information.

In the device for identifying a legitimate viewing area according to the embodiment of the present invention, the determining module 31 includes:

The first determination sub-module 311 is configured to determine the coordinate information of the navigation satellite in the earth-centered coordinate system according to the ephemeris information of the navigation satellite;

The second determination sub-module 312 is configured to determine the coordinate information of the integrated receiver decoder according to the coordinate information of the at least four navigation satellites in the earth-centered coordinate system and the GNSS pseudorange information of the global navigation satellite system;

The third determining sub-module 313 is configured to determine the current location information of the integrated receiving decoder according to the coordinate information of the integrated receiving decoder, where the location information includes the latitude and longitude information of the current location of the integrated receiving decoder .

In the device for identifying a legitimate viewing area according to the embodiment of the present invention, the processing module 32 includes:

The first judging sub-module 321 is used to judge whether the latitude and longitude of the current location of the integrated receiver decoder is within a preset viewing range, and the preset viewing range is a range represented by latitude and longitude coordinates;

The first processing submodule 322 is configured to identify that the integrated receiver decoder is in the legal viewing area if the latitude and longitude of the current location of the integrated receiver decoder is within the preset viewing range, otherwise, identify The integrated reception decoder is outside the legal viewing area.

In the device for identifying a legitimate viewing area according to the embodiment of the present invention, the determining module 31 further includes:

The fourth determination sub-module 314 is used for the third determination sub-module to determine the current position information of the integrated receiver and decoder according to the coordinate information of the integrated receiver and decoder, and then to determine the position information according to the coordinate information of the navigation satellite and the integrated receiver and decoder. The coordinate information of the decoder is received, and the pitch angle and azimuth angle information between the integrated receiving decoder and the navigation satellite are obtained.

In the device for identifying a legitimate viewing area according to the embodiment of the present invention, the processing module 32 includes:

The second judging sub-module 323 is configured to judge whether the pitch angle between the integrated receiver decoder and the navigation satellite is within a preset pitch angle range, and to judge whether the pitch angle between the integrated receiver decoder and the navigation satellite is within the range of the preset pitch angle. Whether the azimuth angle is within a preset azimuth angle range, the preset viewing range information includes a preset pitch angle range and a preset azimuth angle range;

The second processing sub-module 324 is configured to, if the pitch angle between the integrated receiver decoder and the navigation satellite is within the preset pitch angle range, and the distance between the integrated receiver decoder and the navigation satellite If the azimuth angle is within the preset azimuth angle range, it is identified that the integrated receiver decoder is within the legal viewing area, otherwise, it is identified that the integrated receiver decoder is outside the legal viewing area.

In the device for identifying a legitimate viewing area according to the embodiment of the present invention, the fourth determining submodule 314 specifically includes:

The first conversion unit 3141 is used to convert the coordinates of the integrated receiver decoder into space rectangular coordinates according to the coordinate information of the integrated receiver decoder;

The second conversion unit 3142 is configured to convert the coordinates of the navigation satellite in the earth-centered coordinate system into site coordinates centered on the integrated receiver and decoder according to the spatial Cartesian coordinates of the integrated receiver and decoder;

A third conversion unit 3143, configured to convert the site coordinates of the navigation satellite into site polar coordinates;

The determining unit 3144 is configured to obtain the pitch angle and azimuth angle information between the integrated receiver decoder and the navigation position according to the polar coordinates of the site.

Embodiments of the present invention also provide an integrated receiver decoder, including the above-mentioned device for identifying a legal viewing area.

It should be noted that the device and the integrated receiver decoder are the devices and decoders corresponding to the above method embodiments, and all the implementation manners in the above method embodiments are applicable to the embodiments of the device and the integrated receiver decoder, and can also achieve the same technical effect.

According to the method and device for identifying a legal viewing area, and the integrated receiving decoder according to the embodiment of the present invention, the current location information of the integrated receiving decoder is determined according to the navigation information of the navigation satellite; according to the current position of the integrated receiving decoder information and pre-stored preset viewing range information, identify whether the integrated reception decoder is within the legal viewing area, and when the integrated reception decoder is outside the legal viewing area, control the integrated reception decoder to stop receiving Video program information. In the embodiment of the present invention, any ground area where the navigation satellite can be observed can adopt the above technical solution, which has a wide range of applications, and at the same time, the positioning of the integrated receiver and decoder according to the navigation satellite has high positioning accuracy.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (9)

1. A method for identifying a valid viewing area for use in an integrated receiver-decoder, comprising:

determining the current position information of the comprehensive receiving decoder according to the navigation information of the navigation satellite;

identifying whether the comprehensive receiving decoder is in a legal viewing area or not according to the current position information of the comprehensive receiving decoder and the pre-stored preset viewing range information, and controlling the comprehensive receiving decoder to stop receiving video program information when the comprehensive receiving decoder is out of the legal viewing area;

wherein, said recognizing whether the comprehensive receiving decoder is in the legal receiving area according to the current position information of the comprehensive receiving decoder and the pre-stored preset viewing range information comprises:

judging whether a pitch angle between the comprehensive receiving decoder and the navigation satellite is within a preset pitch angle range or not, and judging whether an azimuth angle between the comprehensive receiving decoder and the navigation satellite is within a preset azimuth angle range or not, wherein the preset viewing range information comprises a preset pitch angle range and a preset azimuth angle range;

if the pitch angle between the comprehensive receiving decoder and the navigation satellite is within the preset pitch angle range and the azimuth angle between the comprehensive receiving decoder and the navigation satellite is within the preset azimuth angle range, identifying that the comprehensive receiving decoder is within a legal viewing area, otherwise identifying that the comprehensive receiving decoder is outside the legal viewing area;

the preset pitch angle range comprises a legal range limit of a legal viewing area and a pitch angle of the navigation satellite, and the preset azimuth angle range comprises a legal range limit of a legal viewing area and an azimuth angle of the navigation satellite.

2. The method for identifying legal viewing areas as defined in claim 1, wherein said determining the current position information of the integrated receiver-decoder according to the navigation information of the navigation satellite comprises:

determining coordinate information of the navigation satellite in a geocentric coordinate system according to the ephemeris information of the navigation satellite;

determining the coordinate information of the comprehensive receiving decoder according to the coordinate information of at least four navigation satellites in the geocentric coordinate system and the GPS pseudo-range information of the global positioning system;

and determining the current position information of the comprehensive receiving decoder according to the coordinate information of the comprehensive receiving decoder, wherein the position information comprises the longitude and latitude information of the current position of the comprehensive receiving decoder.

3. The method for identifying a legal viewing area as recited in claim 2, wherein after determining the current position information of the integrated receiver-decoder according to the coordinate information of the integrated receiver-decoder, the method further comprises:

and obtaining pitch angle and azimuth angle information between the comprehensive receiving decoder and the navigation satellite according to the coordinate information of the navigation satellite and the coordinate information of the comprehensive receiving decoder.

4. The method for identifying legal viewing areas as defined in claim 3, wherein said deriving pitch angle and azimuth angle information between said integrated receiver-decoder and said navigation satellite according to said coordinate information of said navigation satellite and said integrated receiver-decoder comprises:

converting the coordinates of the comprehensive receiving decoder into space rectangular coordinates according to the coordinate information of the comprehensive receiving decoder;

converting the coordinates of the navigation satellite in the geocentric coordinate system into the coordinates of a station taking the comprehensive receiving decoder as the center according to the space rectangular coordinates of the comprehensive receiving decoder;

converting the site coordinates of the navigation satellite into site polar coordinates;

and obtaining pitch angle and azimuth angle information between the comprehensive receiving decoder and the navigation satellite according to the polar coordinates of the station.

5. An apparatus for identifying a valid viewing area for use in an integrated receiver-decoder, comprising:

the determining module is used for determining the current position information of the comprehensive receiving decoder according to the navigation information of the navigation satellite;

the processing module is used for identifying whether the comprehensive receiving decoder is in a legal receiving area or not according to the current position information of the comprehensive receiving decoder and the pre-stored preset viewing range information, and controlling the comprehensive receiving decoder to stop receiving the video program information when the comprehensive receiving decoder is out of the legal receiving area;

wherein the processing module comprises:

a second determining submodule, configured to determine whether a pitch angle between the integrated receiver-decoder and the navigation satellite is within a preset pitch angle range, and determine whether an azimuth angle between the integrated receiver-decoder and the navigation satellite is within a preset azimuth angle range, where the preset viewing range information includes a preset pitch angle range and a preset azimuth angle range;

a second processing sub-module, configured to identify that the integrated receiver decoder is located in a legal viewing area if a pitch angle between the integrated receiver decoder and the navigation satellite is within the preset pitch angle range and an azimuth angle between the integrated receiver decoder and the navigation satellite is within the preset azimuth angle range, and otherwise identify that the integrated receiver decoder is outside the legal viewing area;

the preset pitch angle range comprises a legal range limit of a legal viewing area and a pitch angle of the navigation satellite, and the preset azimuth angle range comprises a legal range limit of a legal viewing area and an azimuth angle of the navigation satellite.

6. The apparatus for identifying legitimate viewing areas of claim 5, wherein the determining means comprises:

the first determining submodule is used for determining the coordinate information of the navigation satellite in the geocentric coordinate system according to the ephemeris information of the navigation satellite;

the second determining submodule is used for determining the coordinate information of the comprehensive receiving decoder according to the coordinate information of at least four navigation satellites in the geocentric coordinate system and the GPS pseudo-range information of the global positioning system;

and the third determining submodule is used for determining the current position information of the comprehensive receiving decoder according to the coordinate information of the comprehensive receiving decoder, wherein the position information comprises longitude and latitude information of the current position of the comprehensive receiving decoder.

7. The apparatus for identifying legitimate viewing areas of claim 6, wherein the determining module further comprises:

and the fourth determining submodule is used for obtaining pitch angle and azimuth angle information between the comprehensive receiving decoder and the navigation satellite according to the coordinate information of the navigation satellite and the coordinate information of the comprehensive receiving decoder after the third determining submodule determines the current position information of the comprehensive receiving decoder according to the coordinate information of the comprehensive receiving decoder.

8. The apparatus for identifying a legal viewing area as claimed in claim 7, wherein the fourth determining sub-module specifically comprises:

a first conversion unit for converting the coordinates of the integrated receiver-decoder into spatial rectangular coordinates according to the coordinate information of the integrated receiver-decoder;

the second conversion unit is used for converting the coordinates of the navigation satellite in the geocentric coordinate system into the coordinates of a station taking the comprehensive receiving decoder as a center according to the space rectangular coordinates of the comprehensive receiving decoder;

a third conversion unit, configured to convert the site coordinates of the navigation satellite into site polar coordinates;

and the determining unit is used for obtaining pitch angle and azimuth angle information between the comprehensive receiving decoder and the navigation satellite according to the station polar coordinates.

9. An integrated receiver decoder, comprising means for identifying a legal viewing area as claimed in any one of claims 5 to 8.

Images