JP2008039398A - Pulse radar equipment - Google Patents

Abstract

Since a conventional receiver protection circuit operates at a detection level of a received signal, there is a time until operation after receiving a high-power signal. During that time, a high-power signal is input after an analog baseband circuit, causing damage to elements. Even if not, the characteristics of the circuit and thereafter deteriorate. In addition, the noise figure at the time of reception deteriorates as the received signal level decreases.
An RF pulse generation circuit generates an RF pulse signal from a high-frequency signal from an oscillator, outputs the RF pulse signal from a first signal terminal, and an external reception signal input from a second signal terminal is received by the reception mixer. A high-frequency signal is converted into a frequency conversion signal, a high-frequency component is suppressed by an analog baseband circuit, signal level adjustment is performed, and signal processing is performed by a signal processing unit. And a signal passage / signal cutoff switching circuit that changes the level of the received signal from the second signal terminal with the detection signal of the detection circuit and outputs the signal to the reception mixer.
[Selection] Figure 1

Description

  The present invention relates to a pulse radar device, and more particularly to a technique for protecting circuits after an analog baseband circuit and suppressing characteristic deterioration.

  FIG. 17 shows an example of the configuration of a conventional pulse radar device. 1 is an oscillator, 2 is a first power distribution circuit, 3 is an RF pulse generation circuit, 4 is a reception mixer, 6 is a second power distribution circuit, 7 is a first signal terminal, 8 is a detection circuit, and 9 is a first Reference numeral 2 denotes a signal terminal, 10 denotes a signal passing / signal cutoff switching circuit, 11 denotes an analog baseband circuit, 12 denotes a signal processing unit, and 101 denotes a receiving circuit protection circuit.

  This conventional pulse radar apparatus is provided with a receiving portion protection circuit 101 described in Patent Document 1 between the second signal terminal 9 and the receiving mixer 4. The reception unit protection circuit 101 includes a second power distribution circuit 6, a detection circuit 8, and a signal passing / signal cutoff switching circuit 10. The detection circuit 8 detects the input power to the reception mixer 4, and the signal passing / signal cutoff switching circuit 10 passes or blocks the received signal from the second signal terminal 9. When the detection circuit 8 detects power larger than the set threshold value, the signal passing / signal cutoff switching circuit 10 cuts off the received signal in order to protect the circuits after the reception mixer 4. When the power is smaller than the set threshold value, the received signal passes through the signal passing / signal cutoff switching circuit 10.

  FIG. 18 shows an example of another configuration of a conventional pulse radar apparatus. Description of parts having the same numbers as in FIG. 17 is omitted. Reference numeral 102 denotes another conventional receiver protection circuit, and reference numeral 103 denotes a high-frequency amplifier. The receiver protection circuit 102 includes a signal pass / signal cutoff switching circuit 10 and a high-frequency amplifier 103. In FIG. 18, another receiver protection circuit 102 described in Patent Document 1 is used. The high frequency amplifier 103 outputs a pulsed voltage from any one of the gate terminal, the source terminal, and the drain terminal of the field effect transistor used in the high frequency amplifier 103 at the time of saturation. The level of the received signal from the second signal terminal 9 can be detected based on the presence or absence of the pulse voltage. That is, the high-frequency amplifier 103 in the receiving unit protection circuit 102 serves as a detection circuit and a power distribution circuit in the receiving unit protection circuit 101.

The signals mainly received by the pulse radar device are: (1) a reflection signal from the object of distance measurement, (2) a transmission signal from another pulse radar device, and (3) a wraparound signal of the transmission signal of the own pulse radar device. It is. In particular, the sneak signal of (3) is due to reflection from an object located at a close distance such as the inside of the pulse radar device or radome, and is compared with the reflected signal of (1) and (2) the transmission signal from other devices. Is big.
FIG. 19 shows the operation of the receiver protection circuit in the pulse radar device using the prior art. 19, (a) is an RF (Radio Frequency) pulse signal to be transmitted, (b) is a received RF pulse signal, (c) is an output of a detection circuit, (d) is a state of a signal passing / signal cutoff switching circuit, (E) is a received signal after passing the signal passing / signal cutoff switching circuit.

  In the pulse radar device using the prior art, when the output of the detection circuit exceeds a set threshold value Th, the signal passing / signal cutoff switching circuit 10 operates to cut off the received signal and protect the circuits after the receiving mixer 4. . In the signal passing / signal cutoff switching circuit 10, the received signal passes through the signal passing / signal cutoff switching circuit 10 when the output of the detection circuit is lower than the set threshold Th.

JP-A-5-27010

  In the pulse radar device using the conventional technology, the operation of the receiver protection circuit is not synchronized with the transmission timing, and it takes time / time until the output of the detection circuit reaches a predetermined threshold Th after receiving a large level signal. Cost. For this reason, a signal with a large electric power is input after the analog baseband circuit only during the time period. As a result, although the element is not damaged, the characteristics after the analog baseband circuit are deteriorated.

  In the prior art, since the level of the received signal is detected using a part of the received signal, the noise figure at the time of reception deteriorates as the received signal level decreases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to suppress deterioration of circuit characteristics after an analog baseband circuit and to prevent deterioration of a noise figure.

The pulse radar device according to the present invention is
An oscillator that generates and outputs a high-frequency signal, a first power distribution circuit that distributes the high-frequency signal of the oscillator to a plurality, and one of the high-frequency signals distributed by the first power distribution circuit is turned on and off at a constant cycle An RF pulse generation circuit that generates an RF pulse signal, a second power distribution circuit that distributes the RF pulse signal of the RF pulse generation circuit into a plurality, and the RF pulse signal distributed by the second power distribution circuit A first signal terminal for outputting one to the outside, a detection circuit for detecting the level of the other RF pulse signal distributed by the second power distribution circuit and outputting a detection signal, and a received signal from the outside A second signal terminal for inputting a signal, and a signal passing / signal cutoff for changing the level of the received signal from the second signal terminal according to the detected signal from the detecting circuit and outputting the received signal after the level change A switching circuit; The other output of the oscillator distributed by the first power distribution circuit, the output of the signal passing / signal cutoff switching circuit, and a reception mixer that outputs a frequency conversion signal of a reception signal; The analog baseband circuit that suppresses high-frequency components of the frequency conversion signal and further adjusts the signal level, and a signal processing unit that performs signal processing based on an output signal of the analog baseband circuit.

The pulse radar device according to the present invention is
The detection circuit that operates the signal passing / signal cutoff switching circuit for protecting the circuit on the receiving side does not input the signal received by the pulse radar device as in the conventional receiving circuit protection circuit, but generates an RF pulse. The RF pulse signal to be transmitted generated by the circuit is input. Therefore, by detecting the transmitted RF pulse signal, when an excessive level of received signal is input to the receiving side, the time until the signal passing / signal cutoff switching circuit is cut off can be shortened. When an excessively high level signal is input to the receiving side, it is possible to prevent a large power signal from being input to a circuit after the receiving mixer.

Embodiment 1 FIG.
FIG. 1 is a block diagram of a pulse radar apparatus showing Embodiment 1 of the present invention. In FIG. 1, 1 is an oscillator, 2 is a first power distribution circuit, 3 is an RF pulse generation circuit, 4 is a reception mixer, 6 is a second power distribution circuit, 7 is a first signal terminal, and 8 is a detection circuit. , 9 are second signal terminals, 10 is a signal pass / signal cutoff switching circuit, 11 is an analog baseband circuit, and 12 is a signal processing unit.

Next, the operation will be described.
A high-frequency signal generated by the oscillator 1 is input to the first power distribution circuit 2. The first power distribution circuit 2 distributes the power of the input high frequency signal and outputs it to the RF pulse generation circuit 3 and the reception mixer 4. The RF pulse generation circuit 3 converts the input high frequency signal into an RF pulse signal and outputs it to the second power distribution circuit 6. The second power distribution circuit 6 distributes the input RF pulse signal to the first signal terminal 7 and the detection circuit 8. The first signal terminal 7 outputs the input RF pulse signal to the outside as a transmission signal.

  The second signal terminal 9 outputs an input signal from the outside to the signal passing / signal cutoff switching circuit 10 as a received signal. The signal passing / signal cutoff switching circuit 10 outputs a reception signal whose signal level is changed according to the output signal of the detection circuit 8 to the reception mixer 4. The reception mixer 4 converts the frequency of the output signal from the signal passing / signal cutoff switching circuit 10 using the output signal of the first power distribution circuit 2, and processes the converted frequency converted signal via the analog baseband circuit 11. To the unit 12. The signal processing unit 12 calculates the relative distance, relative speed, relative angle, etc. of the object based on the input signal.

The detection circuit 8 uses the output of the second power distribution circuit 6 as an input signal, detects the level of this input signal, and outputs the detection signal to the signal passing / signal cutoff switching circuit 10.
FIG. 2 shows operations of the detection circuit 8 and the signal passing / signal cutoff switching circuit 10 in the pulse radar device according to the first embodiment. (A) is the transmitted RF pulse signal, (b) is the received RF pulse signal, (c) is the output of the detection circuit 8, (d) is the state of the signal passing / signal cutoff switching circuit 10, and (e) is the signal. The received signal after passing through the passage / signal cutoff switching circuit 10.

  Here, the detection circuit 8 does not input the signal received by the pulse radar device as in the conventional receiver protection circuit 101 or 102, but the RF pulse signal distributed from the second power distribution circuit 6, That is, an RF pulse signal to be transmitted is input. Accordingly, as shown in FIG. 19 (c), an excessive level signal is input to the detection circuit 8, and the signal is transmitted as shown in FIG. 2 (c) without waiting for the output of the detection circuit 8 to reach the threshold Th. By detecting the RF pulse signal, it is possible to shorten the time until the signal passing / signal cutoff switching circuit 10 is cut off. As a result, an excessive level signal is transmitted to the receiving side as shown in FIG. When the signal is input, it is possible to prevent a signal having a large power from being input to the circuits after the reception mixer 4.

  According to the configuration of the present invention, since the transmission signal is distributed by performing power detection, it is possible to prevent deterioration of the noise figure at the time of reception as compared with the circuit configuration using the conventional technique. On the other hand, the noise figure at the time of transmission deteriorates as compared with the circuit configuration using the conventional technique. However, since the signal-to-noise ratio of the transmitter is generally sufficiently high, the influence of the deterioration of the noise figure during transmission on the radar performance is small.

An example of the configuration of the detection circuit 8 will be described with reference to FIG. In FIG. 3, 8 is a detection circuit, 32 is an input terminal of the detection circuit, 33 is a detection diode, 34 is a λ / 4 wavelength line for choke, and 35 is an output terminal of the detection circuit.
The description of the already explained numbers is omitted.
The detection circuit 8 inputs the RF pulse signal for transmission distributed by the second power distribution circuit 6 from the input terminal 32. When the RF pulse signal is a certain level or higher, the detection circuit 33 passes the signal through the detection diode 33. A DC voltage that causes the signal cut-off switching circuit 10 to cut off the signal is output to the λ / 4 wavelength line 34 for choke. The λ / 4 wavelength line 34 for choke outputs the DC voltage from the detection diode 33 to the output terminal 35 of the detection circuit, while the reception signal passes from the signal passing / signal cutoff switching circuit 10 to the detection diode 33 side. To prevent. Here, the signal that can be prevented from wrapping around the λ / 4 wavelength line 34 is a specific frequency, but it can be applied up to a very high frequency signal such as a millimeter wave band.

  Further, the detection circuit 8 may be another detection circuit shown in FIG. 4 and has the same effect. The description of the numbers already described in FIG. 4 is omitted. 8 is a detection circuit, and 44 is a choke coil. The choke coil outputs the DC voltage from the detection diode 33 to the output terminal 35 of the detection circuit, while preventing the received signal from flowing into the detection diode 33 side from the signal passing / signal cutoff switching circuit 10. Here, the signal that can be prevented from wrapping around by the choke coil 44 is a signal having a frequency higher than a specific frequency, and it is difficult to prevent the wrapping of a signal having a very high frequency, but it is received in a relatively low frequency band. This is applicable when the signal to be processed has a plurality of frequency components or has a wide frequency range.

  The detection circuit 8 uses the detection diode 33. However, a circuit that can obtain the same effect, for example, an RSSI (Receiver Signal Strength Indicator) circuit, a log amplifier circuit, or the like may be used. The detection circuit is shown in FIGS. It is not limited to the detection circuit shown.

  Details of the signal pass / signal cutoff switching circuit 10 will be described with reference to FIG. The description of the numbers already described in FIG. 5 is omitted. In FIG. 5, 10 is a signal passing / signal cutoff switching circuit, 52 and 53 are DC cut capacitors, and 54 is a signal passing / signal cutoff switching limiter diode. The DC cut capacitors 52 and 53 prevent the DC voltage from being applied to the second signal terminal 9 and the reception mixer 4 when a DC voltage is applied to the signal passing / signal cutoff switching limiter diode 54 by the detection circuit. When a voltage higher than a certain level is applied from the detection circuit 8, the signal pass / signal cut-off switching limiter diode 54 has a low impedance and grounds the received signal from the second signal terminal 9 in a high frequency manner. On the other hand, when the voltage applied from the detection circuit 8 is less than a certain level, the impedance of the signal passing / signal cutoff switching limiter diode 54 is high, and the received signal from the second signal terminal 9 is passed through the DC cut capacitors 52 and 53. To the reception mixer 4 via

  Further, the signal passing / signal cutoff switching circuit 10 may be another signal passing / signal cutoff switching circuit shown in FIG. 6, and has the same effect as the signal passing / signal cutoff switching circuit 10 of FIG. The description of the numbers already described in FIG. 6 is omitted. In FIG. 6, 10 is a signal passing / signal cutoff switching circuit, 62 is a signal input terminal, 63 is a signal output terminal, 64 is a control signal input terminal, and 65 is a variable attenuation circuit. The signal passage / signal cutoff switching circuit 10 changes the attenuation amount of the variable attenuation circuit 65 in accordance with the voltage of the control signal applied to the control signal input terminal 64 from the detection circuit 8, and the input terminal from the second signal terminal 9. The reception signal input to 62 is attenuated and the reception signal attenuated from the output terminal 63 to the reception mixer 4 is output. Here, when the voltage level of the control signal applied from the detection circuit 8 is large, the signal passing / signal cutoff switching circuit 10 shown in FIG. 6 is made to pass the signal shown in FIG. / Same effect as the signal cutoff switching circuit 10 is obtained.

  In addition to the signal passing / signal cutoff switching circuit shown in FIGS. 5 and 6, the signal passing / signal cutoff switching circuit 10 of the pulse radar apparatus shown in FIG. The signal passing / signal cutoff switching circuit 10 is not limited to the signal passing / signal cutoff switching circuit shown in FIGS.

Embodiment 2. FIG.
FIG. 7 is a block diagram of a pulse radar apparatus showing Embodiment 2 of the present invention. The description of the parts having the same numbers as those already described is omitted. Unlike FIG. 1, the position of the signal passing / signal cutoff switching circuit 10 is between the first power distribution circuit 2 and the reception mixer 4. Here, although the position of the signal passing / signal cutoff switching circuit 10 is different from that in FIG. 1, the detection circuit 8 uses the output of the second power distribution circuit 6 as an input signal, detects the level of the input signal, and detects the detection signal. Is output to the signal pass / signal cut-off switching circuit 10, the on / off state of the reception mixer 4 can be controlled. Therefore, the reception mixer 4 can be turned off at the timing of transmitting the RF pulse signal, and a large level signal is input to the reception mixer 4, but the analog baseband circuit 11 and the signal processing unit 12 are input. Thus, the same effects as those of the first embodiment shown in FIG. 1 can be obtained.

Embodiment 3 FIG.
FIG. 8 is a block diagram of a pulse radar apparatus showing Embodiment 3 of the present invention. The description of the parts having the same numbers as those already described is omitted. This embodiment differs from the embodiment shown in FIGS. 1 and 7 in that the signal passing / signal cutoff switching circuit 10 is positioned between the reception mixer 4 and the analog baseband circuit 11. Here, although the position of the signal passing / signal cutoff switching circuit 10 is different from those in FIGS. 1 and 7, the detection circuit 8 uses the output of the second power distribution circuit 6 as an input signal to detect the level of the input signal. By outputting the detection signal to the signal passage / signal cutoff switching circuit 10, the output signal of the reception mixer 4 can be cut off at the timing of transmitting the RF pulse signal.
Therefore, a large level signal is input to the reception mixer 4, but the same effect as that of the first embodiment shown in FIG. 1 can be obtained for the analog baseband circuit 11 and the signal processing unit 12. .

Embodiment 4 FIG.
FIG. 9 is a block diagram of a pulse radar apparatus showing Embodiment 4 of the present invention. The description of the parts having the same numbers as those already described is omitted. The configuration of the pulse radar device according to the fourth embodiment is such that the signal passage / signal cutoff switching circuit 10 is provided at a plurality of locations. That is, the location signal passing / signal cutoff switching circuit 10 is provided at a plurality of locations or all of the locations where the signal passing / signal cutoff switching circuit 10 shown in FIGS. 1, 7, and 8 is installed. The fourth embodiment shown in FIG. 9 is an example in which the signal pass / signal cut-off switching circuit 10 is provided in all the places where the signal pass / signal cut-off switching circuit 10 shown in FIGS. 1, 7, and 8 is installed. The sneak signal of the transmission signal input to the analog baseband circuit can be blocked more strongly than the configuration of the pulse radar device shown in FIGS.

Embodiment 5. FIG.
FIG. 10 is a block diagram of a pulse radar apparatus showing Embodiment 5 of the present invention. The parts already described are the same as the already described numbers, and the description thereof is omitted. In FIG. 10, 13 is a delay circuit, which is added between the detection circuit 8 and the signal passing / signal blocking circuit 10 of the pulse radar apparatus shown in FIG.

  When the operation of the detection circuit 8 and the signal passing / signal cutoff switching circuit 10 by the pulse radar device is as shown in FIGS. 11A to 11F, the delay circuit 13 having an appropriate delay time shown in FIG. 10 is provided. By delaying the timing at which the signal passing / signal cut-off switching circuit 10 is turned off by the pulse radar device, as shown in FIGS. 11 (g) to 11 (l), the received signal sneak from the transmitting side to the receiving circuit side. Effectively cut off.

  Here, the position of the delay circuit 13 may be between the second power distribution circuit 6 and the detection circuit 8 instead of between the detection circuit 8 and the signal passing / signal cutoff circuit 10, and the same effect is obtained.

  Here, depending on the pulse radar device, as shown in FIGS. 12A to 12F, the timing at which the signal passing / signal cutoff switching circuit 10 is in the cutoff state is too late, and the transmission side wraps around to the reception circuit side. However, it may not be possible to block the received signal. In FIGS. 12A to 12F, when the signal passing / signal cutoff switching circuit 10 is cut off too late, (g) to (l) are the signal passing / signal cutoff switching circuit by the delay circuit 13. It is assumed that the timing at which 10 is cut off is appropriate, (a) and (g) are outputs of the RF pulse signal generation circuit 3, (b) and (h) are RF pulse signals to be transmitted, and (c). , (I) is the output signal of the detection circuit 8, (d), (j) is the state of the signal passing / signal cutoff switching circuit 10, and (e), (k) are receptions that wrap around from the transmitting side to the receiving circuit side. Pulse signals (f) and (l) are received signals after passing through the signal passing / signal cutoff switching circuit 10.

Embodiment 6 FIG.
FIG. 13 is a block diagram of a pulse radar apparatus showing Embodiment 6 of the present invention. The parts that have already been described are assigned the same reference numerals and the description thereof is omitted. In the sixth embodiment, unlike the fifth embodiment shown in FIG. 10, the position of the delay circuit 13 is between the second power distribution circuit 6 and the first signal terminal 7.

  In the cases shown in FIGS. 12A to 12F, the transmission timing of the RF pulse signal to be transmitted is delayed by using a delay circuit having an appropriate delay time, so that the transmission timing is changed from (g) to (l). Here, since the RF pulse signal is directly input from the RF pulse generation circuit 3 to the detection circuit 8 without going through the delay circuit, the timing at which the signal passing / signal cutoff switching circuit 10 becomes the signal cutoff does not change. However, the transmission signal from the first signal terminal 7 is transmitted with an appropriate delay time. Therefore, the timing at which the sneak signal of the transmission signal wraps around to the receiving circuit side is relatively delayed with respect to the timing at which the signal passing / signal cutoff switching circuit 10 is severed, and the sneak around the transmitting circuit slew from the transmitting side to the receiving circuit side. The received signal can be effectively blocked.

  An example of the delay circuit 13 shown in FIGS. 10 and 13 is shown in FIG. In FIG. 14, 70 is a delay circuit, 71 is an input terminal of the delay circuit, and 72 is an output terminal of the delay circuit. 10 and 13 may be a SAW (surface acoustic wave :) delay line, a programmable delay line, or the like, and is not limited to the delay circuit 70 shown in FIG.

  Here, the first signal terminal 7 of the pulse radar apparatus shown in FIGS. 1, 7, 8, 9, 10, and 13 outputs an RF pulse signal as a transmission signal, and the second signal terminal 9 The RF pulse signal is input as a reception signal. However, the connection between each signal terminal, the transmission antenna, and the reception antenna may be connected to an antenna integrated with transmission and reception as shown in FIG. In FIG. 15, 81 is an antenna integrated with transmission / reception, 82 is a transmission signal input terminal, 83 is a reception signal output terminal, and 84 is a circulator. The circulator 84 outputs the transmission signal input from the first signal terminal 7 of the pulse radar device via the transmission signal input terminal 82 to the antenna 81 integrated with transmission / reception, and received from the antenna 81 integrated with transmission / reception. The output signal is output to the reception signal output terminal 83, and the reception signal is output to the second signal terminal 9 of the pulse radar device. According to the antenna integrated with transmission and reception in FIG. 15, only one antenna is required for the pulse radar device.

  Here, the first signal terminal 7 and the transmission antenna of the pulse radar device shown in FIGS. 1, 7, 8, 9, 10 and 14 are connected to the second signal terminal 9 and the reception antenna of the pulse radar device. The connection may be made with an antenna separated for transmission and reception as shown in FIG. In FIG. 16, 90 is a transmission antenna, 91 is a transmission signal input terminal, 92 is a reception antenna, 93 is a reception signal output terminal, and the transmission signal input terminal 91 is connected to the first signal terminal 7 of the pulse radar device to receive the signal. The signal output terminal 93 is connected to the second signal terminal 9 of the pulse radar device. According to the antennas separated by transmission and reception in FIG. 16, two antennas are required for the pulse radar device, but the amount of transmission signal that wraps around to the reception side can be suppressed.

  The present invention is applied to a pulse radar device such as an on-vehicle radar, and can prevent noise figure degradation at the time of reception accompanying reception signal level lowering, and can protect a receiving side circuit at the time of receiving a high power signal.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the pulse radar apparatus by Embodiment 1 of this invention. 6 is an operation explanatory diagram of a reception unit protection circuit in Embodiment 1. FIG. FIG. 2 is a configuration circuit diagram of a detection circuit in the first embodiment. FIG. 6 is a configuration circuit diagram of another example of the detection circuit according to the first embodiment. FIG. 3 is a configuration circuit diagram of a signal passing / signal cutoff switching circuit in the first embodiment. FIG. 7 is a configuration circuit diagram of another example of the signal passing / signal cutoff switching circuit according to the first embodiment. It is a block diagram of the pulse radar apparatus by Embodiment 2 of this invention. It is a block diagram of the pulse radar apparatus by Embodiment 3 of this invention. It is a block diagram of the pulse radar apparatus by Embodiment 4 of this invention. It is a block diagram of the pulse radar apparatus by Embodiment 5 of this invention. It is operation | movement explanatory drawing of a delay circuit when the interruption | blocking state timing of a signal passage / signal interruption | blocking switching circuit is too early. It is operation | movement explanatory drawing of a delay circuit when the interruption | blocking state timing of a signal passage / signal interruption | blocking switching circuit is too late. It is a block diagram of the pulse radar apparatus by Embodiment 6 of this invention. It is a block diagram which shows an example of a delay circuit. It is a block diagram which shows the relationship between a transmission / reception integrated antenna and each signal terminal. It is a block diagram which shows the relationship between each signal terminal in case a transmitting antenna and a receiving antenna are separate. It is a block diagram which shows an example of the conventional pulse radar apparatus. It is a block diagram which shows another example of the conventional pulse radar apparatus. It is operation | movement explanatory drawing of the receiving part protection circuit in the conventional pulse radar apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1; Oscillator, 2; 1st power distribution circuit, 3; RF pulse generation circuit, 4; Reception mixer, 6; 2nd power distribution circuit, 7: 1st signal terminal, 8; Detection circuit, 9; 2 signal terminals, 10; signal passing / signal cutoff switching circuit, 11; analog baseband circuit, 12; signal processing unit, 13; delay circuit, 32; detection circuit input terminal, 33; Λ / 4 wavelength line, 35; output terminal of detection circuit, 44; choke coil, 52 and 53; DC cut capacitor, 54; limiter diode for switching signal passing / shut-off, 62; signal input terminal, 63; signal Output terminal 64; control signal input terminal 65; variable attenuation circuit 81; transmission / reception integrated antenna 82; transmission signal input terminal 83; reception signal output terminal 84; circulator 101, 102; Circuit.

Claims (6)

  An oscillator that generates and outputs a high-frequency signal, a first power distribution circuit that distributes the high-frequency signal of the oscillator to a plurality, and one of the high-frequency signals distributed by the first power distribution circuit is turned on and off at a constant cycle An RF pulse generation circuit that generates an RF pulse signal, a second power distribution circuit that distributes the RF pulse signal of the RF pulse generation circuit into a plurality, and the RF pulse signal distributed by the second power distribution circuit A first signal terminal for outputting one to the outside, a detection circuit for detecting the level of the other RF pulse signal distributed by the second power distribution circuit and outputting a detection signal, and a received signal from the outside A second signal terminal for inputting a signal, and a signal passing / signal cutoff for changing the level of the received signal from the second signal terminal according to the detected signal from the detecting circuit and outputting the received signal after the level change A switching circuit; The other output of the oscillator distributed by the first power distribution circuit, the output of the signal passing / signal cutoff switching circuit, and a reception mixer that outputs a frequency conversion signal of a reception signal; The analog baseband circuit that suppresses high-frequency components of the frequency conversion signal and further adjusts the signal level, and a signal processing unit that performs signal processing based on the output signal of the analog baseband circuit. A pulse radar device.   An oscillator that generates and outputs a high-frequency signal, a first power distribution circuit that distributes the high-frequency signal of the oscillator to a plurality, and one of the high-frequency signals distributed by the first power distribution circuit is turned on and off at a constant cycle An RF pulse generation circuit that generates an RF pulse signal, a second power distribution circuit that distributes the RF pulse signal of the RF pulse generation circuit into a plurality, and the RF pulse signal distributed by the second power distribution circuit A first signal terminal for outputting one to the outside, a detection circuit for detecting the level of the other RF pulse signal distributed by the second power distribution circuit and outputting a detection signal, and a first power distribution The other output of the oscillator distributed by the circuit, the detection signal from the detection circuit, a signal passing / signal cutoff switching circuit for outputting an on / off signal, and a second signal for inputting a reception signal from the outside Terminal And the received signal from the second signal terminal is input, the level of the received signal is changed according to the on / off signal of the signal passing / signal cutoff switching circuit, and the frequency conversion signal of the received signal whose level is changed is output. Signal processing based on the output signal of the analog baseband circuit, the analog baseband circuit that suppresses the high frequency component of the frequency conversion signal from the reception mixer, and further adjusts the signal level A pulse radar device comprising: a signal processing unit that performs the operation.   An oscillator that generates and outputs a high-frequency signal, a first power distribution circuit that distributes the high-frequency signal of the oscillator to a plurality, and one of the high-frequency signals distributed by the first power distribution circuit is turned on and off at a constant cycle An RF pulse generation circuit that generates an RF pulse signal, a second power distribution circuit that distributes the RF pulse signal of the RF pulse generation circuit into a plurality, and the RF pulse signal distributed by the second power distribution circuit A first signal terminal for outputting one to the outside, a detection circuit for detecting the level of the other RF pulse signal distributed by the second power distribution circuit and outputting a detection signal, and a received signal from the outside Is input to the second signal terminal, the received signal from the second signal terminal, and the other output of the oscillator distributed by the first power distribution circuit, and outputs the frequency conversion signal of the received signal Receive Miku A signal passing / signal cutoff switching circuit that changes the level of the frequency conversion signal from the reception mixer according to the detection signal from the detection circuit, and outputs the frequency conversion signal after the level change, and the signal passing / signal The analog baseband circuit that suppresses the high frequency component of the frequency conversion signal after the level change from the cutoff switching circuit and further adjusts the signal level, and the signal processing based on the output signal of the analog baseband circuit A pulse radar device comprising: a signal processing unit for performing.   An oscillator that generates and outputs a high-frequency signal, a first power distribution circuit that distributes the high-frequency signal of the oscillator to a plurality, and one of the high-frequency signals distributed by the first power distribution circuit is turned on and off at a constant cycle An RF pulse generation circuit that generates an RF pulse signal, a second power distribution circuit that distributes the RF pulse signal of the RF pulse generation circuit into a plurality, and the RF pulse signal distributed by the second power distribution circuit One of them is a first signal terminal for outputting an RF pulse signal to the outside, a second signal terminal for inputting a reception signal from the outside, a reception signal from the second signal terminal, and a first power distribution circuit The other output of the oscillator distributed by the input is input, the reception mixer that outputs the frequency conversion signal of the reception signal, the high frequency component of the frequency conversion signal from the reception mixer is suppressed, and the signal level is further adjusted A Based on the output signal of the log baseband circuit, the analog baseband circuit, the signal processing unit for processing the signal, and the level detection of the other RF pulse signal distributed by the second power distribution circuit A detection circuit for outputting a detection signal, and a signal passing / signal cutoff switching circuit for changing a reception signal level in accordance with the detection signal from the detection circuit, a reception mixer between the second signal terminal and the reception mixer And a first power distribution circuit and a plurality of or all of them between a reception mixer and an analog baseband circuit.   The delay circuit which delays the output signal of the detection circuit input into the signal passage / signal cutoff switching circuit from the RF pulse signal from the RF pulse generation circuit is provided. The radar device according to item.   5. The pulse radar device according to claim 1, further comprising a delay circuit that delays an RF pulse signal output from the first signal terminal. 6.

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