JP2006258644A - Phased-array antenna radar and transmitting chirp signal acquisition method for calibration - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means for enabling recording of a transmitting chirp signal used as a compression reference function of a receiving signal by covering the whole radar at sufficient precision. <P>SOLUTION: A phased-array antenna radar comprises branching a part of the transmitting chirp signal during a phase shift and an amplified observation mode with a branching filter 128 by a transmitting phase shifter 1211 and a transmitting amplifier 123 in each transmitting and receiving module 12 of a phased array antenna 1, passing a receiving amplifier 127 and a receiving phase shifter 1212 in the transmitting and receiving module 12 to be looped back, performing data processing by receiving the looped-back transmitting chirp signal and being recorded in a data recorder 25 as a calibration chirp signal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a phased array antenna radar including a plurality of radiating elements arranged at a predetermined interval and a phased array antenna having a plurality of transmission / reception modules provided for each of the radiating elements.

  In a radar apparatus, a phased array antenna using a transmission / reception module is often used. A phased array antenna is an arbitrary one that feeds a high-frequency current having a predetermined phase relationship to each of a plurality of radiating elements (antenna arrays) arranged at predetermined intervals, and combines the characteristics of the radiating elements. It is an antenna that can obtain the directivity characteristics. Since this phased array antenna can scan the directivity by changing the phase relationship between the radiating elements without using a mechanical configuration, the antenna is mounted on a mobile object (especially an aircraft) or an artificial satellite. Often used as

  In a phased array antenna using a transmission / reception module, the RF characteristics of each transmission / reception module affect the chirp waveform transmitted / received by the antenna. In particular, the transmission / reception module is usually exposed to the antenna surface, that is, the outside of the airframe, not the inside of the airframe where the temperature is kept constant, unlike other RF devices. Therefore, the influence of temperature on the RF characteristics of the transmission / reception module cannot be ignored and affects the chirp compression performance.

  In order to eliminate the problem of such characteristic fluctuations, conventionally, in a radar apparatus such as a combined aperture radar mounted on an aircraft or satellite platform, the linearity and saturation level of the receiver are measured separately from the observation mode. A method for setting a calibration mode for transmitting a chirp signal for calibration for use in (calibration) and calibrating the RF characteristics of the receiver (Patent Document 1), or using a monitor antenna, from the monitor antenna A method of acquiring calibration information by receiving a transmitted signal with a radar antenna or conversely receiving a signal transmitted from a radar antenna with a monitoring antenna has been proposed (Patent Document 2).

  FIG. 9 is a block diagram showing a conventional example of a phased array antenna radar in which the calibration mode is set, and FIG. 10 is a timing chart showing its operation. This phased array antenna radar is composed of a phased array antenna 1 and an electric circuit unit 2, and each is connected by a transmission / reception antenna cable 31.

  In FIG. 9, the phased array antenna 1 demultiplexes the transmission signal from the transmitter 22 of the electric circuit unit 2 into a plurality of transmission / reception modules 12, and multiplexes the signals from each transmission / reception module 12. The multiplexer / demultiplexer 13 to be output to the receiver 23 and the phase shift and amplification of the transmission signal from the multiplexer / demultiplexer 13 at the transmission timing and output to the radiating element 11, and at the reception timing from the radiating element 11. A plurality of transmission / reception modules 12 that perform phase shift and amplification of the reception signal and output to the multiplexer / demultiplexer 13, and a radiation element 11 that is connected to each transmission / reception module 12 and that receives the transmission wave and the reflected wave from the target Composed.

  Each transmission / reception module 12 performs a phase shift of the transmission signal from the multiplexer / demultiplexer 13 and a phase shifter 121 that shifts the phase of the reception signal, a transmission amplifier 123 that amplifies the transmission signal, and the radiation element 11. Switch 124 for switching between transmission to and reception from radiating element 11, terminator 126, switch 125 for switching reception from terminator 126 and radiating element 11, and receiving amplifier 127 for amplifying the received signal. And a transmission / reception switching switch 122 connected between the transmission amplifier 123 or the reception amplifier 127 and the phase shifter 121.

  The electric circuit unit 2 includes a chirp signal generator 21 that generates a transmission signal, a transmitter 22 having a frequency converter / amplifier 221, a switch 222, and a circulator 223, an attenuator 232, a switch 233, and a frequency converter. A receiver 23 having an amplifier 231, a data processing device 24 that samples a signal input from the receiver 23 and performs various processes, and a data recorder 25 that records digital data sampled and processed by the data processing device And a control device 26 that controls each device of the phased array antenna 1 and the electric circuit unit 2.

  In the observation mode, the switch 222 of the transmitter 22 outputs the transmission signal generated by the chirp signal generator 21 and frequency-converted and amplified by the frequency converter / amplifier 221 to the phased array antenna 1 side via the circulator 223. In the calibration mode, switching control is performed so that the transmission signal generated by the chirp signal generator 21 and frequency-converted and amplified by the frequency converter / amplifier 221 is output to the receiver 23 as a return signal. The switch 233 of the receiver 23 outputs the reflected signal received by the phased array antenna 1 in the observation mode and input via the circulator 223 to the frequency conversion / amplifier 231 and in the calibration mode. Switching control is performed so that the folding signal input via the switch 222 and the attenuator 232 of the receiver 23 is output to the frequency conversion / amplifier 231.

  Next, the operation of the conventional phased array antenna radar will be described with reference to FIGS.

  In the observation mode, the transmission wave from the phased array antenna 1 is radiated at a constant pulse repetition period, and the reflected wave is received from the target at a timing between transmissions. Therefore, at the transmission timing in the observation mode, the switch 122 in the transmission / reception module 12 sets a route for connecting the phase shifter 121 and the transmission amplifier 123, and the switch 124 is a route for connecting the transmission amplifier 123 and the radiation element 11. The switch 125 sets a route for connecting the terminator 126 and the reception amplifier 127. Further, at the reception timing in the observation mode, the switch 122 sets a route for connecting the reception amplifier 127 and the phase shifter 121, and the switch 124 and the switch 125 have a route for connecting the radiation element 11 and the reception amplifier 127. Set.

  The transmission signal generated by the chirp signal generator 21 at the transmission timing in the observation mode is frequency converted and amplified by the transmitter 22, distributed to the plurality of transmission / reception modules 12 by the multiplexer / demultiplexer 13, and phase-shifted by the transmission / reception module 12. Then, it is amplified and output to the radiating element 11, and is emitted from the phased array antenna 1 as an electromagnetic wave having a predetermined directivity characteristic. On the other hand, the reception signal received by the radiating element 11 at the reception timing in the observation mode is amplified and phase-shifted by the transmission / reception module 12, is multiplexed by the multiplexer / demultiplexer 13, is frequency-converted and amplified by the receiver 23, After the sampling and various processes are executed by the data processing device 24, it is recorded in the data recorder as a digitized received signal.

  On the other hand, in the calibration mode, the transmission signal generated by the chirp signal generator 21 is turned back to the receiver 23 by the switch 222 in the transmitter 22 and passes through the attenuator 232 and the switch 233 in the receiver 23. After being input to the frequency conversion / amplifier 231, frequency-converted and amplified, subjected to sampling and various processing by the data processing device 24, it is recorded in the data recorder as a digitized received signal. The calibration signal recorded in the data recorder is used as a reference function for reproducing the received signal recorded in the data recorder. Moreover, it is used for the calibration of this apparatus by analyzing the calibration signal data.

JP-A-61-213783 Japanese Patent Laid-Open No. 10-246779

  In the above conventional technology, transmission waveform acquisition is performed in the calibration mode at a timing different from the observation mode, but this radar device is mounted on a device that moves at high speed such as an aircraft or an artificial satellite These phased array antennas exposed to the outside of the fuselage vary greatly in the surrounding environment (temperature, etc.) between the observation mode and calibration mode, so the chirp characteristics due to temperature fluctuations due to timing differences between the two The effects of fluctuations cannot be ignored.

  Furthermore, in the above-described prior art, the phased array antenna and the electric circuit unit are connected by a transmission / reception antenna cable, and recording of a transmission chirp signal for calibration is performed in a calibration mode set at a timing different from the observation mode. Is implemented by switching the route of the transmission chirp signal to the route that directly loops back from the transmitter to the receiver, so that only the characteristics of the electric circuit section are reflected in the recorded calibration signal.

  However, in the case of a phased array antenna, each transmission / reception module on the phased array antenna side includes a phase shifter and an amplifier. The characteristics of these phase shifters and amplifiers also affect the signal measured in the observation mode. It becomes. Therefore, although the characteristic variation cannot be ignored, the above-described conventional technique has a problem in that complete calibration cannot be performed because the measurement including the RF characteristic of the transmission / reception module is not performed during the chirp compression of the calibration signal.

  Further, as described in Patent Document 2, a monitor antenna is used, and a signal transmitted from the monitor antenna is received by the radar antenna, or conversely, a signal transmitted from the radar antenna is monitored. In the case of the method of receiving with the antenna, since the monitor antenna is used, the accuracy between the monitor antenna and the radar antenna is not sufficient, and it is necessary to calibrate separately for transmission and reception. However, there is a problem that it cannot be used for calibration of the transmission signal with high accuracy. Further, since a monitor antenna must be provided separately, the configuration becomes complicated.

  An object of the present invention is to provide a means capable of recording a transmission chirp signal that covers the entire radar apparatus with sufficient accuracy and can be used as a reference function for compression of a reception signal with a relatively simple configuration.

  Another object of the present invention is to improve the chirp compression performance including the RF characteristics of the transceiver module.

  Still another object of the present invention is to provide a calibration means in which the transmission timings of the observation mode and the calibration mode are matched so that the influence of fluctuations in the chirp characteristics due to the timing difference between them does not occur.

  A calibration chirp signal acquisition method in a phased array antenna radar according to the present invention includes a plurality of radiating elements and a phased array antenna having a plurality of transmitting / receiving modules provided corresponding to the plurality of radiating elements, respectively. At the transmission timing in the radar observation mode, a part of the transmission chirp signal phase-shifted and amplified by the transmission phase shifter and transmission amplifier in each transmission / reception module for radiating from each radiating element is demultiplexed. Then, the demultiplexed transmission chirp signal is turned back through the reception amplifier and the reception phase shifter in each of the transmission / reception modules, the returned transmission chirp signal is received, processed, and recorded as a calibration signal. It is characterized by that.

  The phased array antenna radar according to the present invention includes a plurality of radiating elements arranged at predetermined intervals, a transmission signal provided for each of the radiating elements, and a signal received by the radiating element. A transmission chirp signal in an observation mode having a phased array antenna composed of a plurality of input / output modules and being phase-shifted and amplified by a transmission phase shifter and a transmission amplifier provided in each of the transmission / reception modules; A function of demultiplexing a part of the transmission chirp signal in synchronization, and a part of the demultiplexed transmission chirp signal via a reception amplifier and a reception phase shifter provided in each of the transmission / reception modules And a function for generating a calibration signal by receiving the folded transmission chirp signal and processing the data. For example, characterized in that is.

  Usually, in a radar apparatus, a transmission system route and a reception system route are often shared, and even in the conventional configuration described above, a phased array antenna multiplexer / demultiplexer and a phase shifter in a transmission / reception module However, in the present invention, the transmission in the observation mode is performed immediately before the radiating element of the antenna by making the transmission system route and the receiving system route independent, except for the radiating element of the antenna. A part of the chirp signal can be folded.

  Therefore, in the present invention, the antenna cable for connecting the electric circuit section and the phased array antenna is prepared for each of the transmission-only and reception-only antenna cables without being shared for transmission and reception, and the phased-array antenna As for the multiplexer / demultiplexer connected to the antenna cable, a duplexer connected to the transmission dedicated antenna cable and a multiplexer connected to the reception dedicated antenna cable are separately prepared. In addition, as a phase shifter in each transmission / reception module, a transmission-only and a reception-only one are prepared, and a transmission system is passed through a duplexer / switching device at a stage after the transmission amplifier in the transmission / reception module and at a stage before the reception amplifier. Prepare a return route from to the receiving system.

  That is, in the present invention, a chirp signal generated by a chirp signal generator and frequency / level converted by a transmitter is demultiplexed to each transmission / reception module by a transmission-system demultiplexer, and amplified by each transmission / reception module to be radiated from the antenna. Send from. At the time of this transmission, the transmission wave is demultiplexed in the transmission / reception module and turned back to the route of the reception system. The folded signal is multiplexed by a receiving multiplexer, frequency / level converted by a receiver, and then sampled (A / D converted) by a data processing device, thereby recording a transmission chirp signal as digital data. To do.

  Furthermore, the reflected wave from the target with respect to the transmission chirp signal transmitted from the radiating element of the antenna is received at the timing between transmission and transmission in the same manner as in a normal radar device, and is multiplexed by a receiving system multiplexer. The frequency and level are converted by the receiver, and the data is sampled (A / D converted) by the data processor, and recorded as a received chirp signal.

  According to the present invention, the transmission chirp signal generated by the chirp signal generator is folded back in the transmission / reception module to obtain a calibration chirp signal, so that transmission chirp signal information closer to the actual transmission wave can be acquired. It is possible to improve the chirp compression performance.

  Furthermore, in the present invention, since the transmission waveform is acquired simultaneously with the observation, the time lag between the observation and the calibration does not occur. Therefore, the fluctuation of the chirp characteristic due to the temporal fluctuation of the temperature can be corrected, and the chirp compression performance is improved. Is possible.

  In addition, according to the present invention, since a transmission waveform for calibration can be acquired simultaneously with observation, it is not necessary to perform transmission waveform acquisition in a calibration mode set at a timing different from the observation mode. Opportunities can be increased.

  Further, by folding back the output of the transmission amplifier of the transmission / reception module, radiometric calibration including a transmission power level that cannot be achieved by the conventional technique can be performed, and the radiometric accuracy can be improved.

  FIG. 1 is a block diagram of a phased array antenna radar showing an embodiment of the present invention.

  The phased array antenna radar according to the present embodiment is also composed of the phased array antenna 1 and the electric circuit unit 2. For connection between the phased array antenna 1 and the electric circuit unit 2, the transmission dedicated antenna cable 32 and the reception dedicated antenna are used. A cable 33 is used.

  The phased array antenna 1 includes a duplexer 131 that demultiplexes a transmission signal from the transmitter 22 of the electric circuit unit 2 into a plurality of transmission / reception modules 12, and a signal from each transmission / reception module 12 that combines the signals from the transmission / reception modules 12. A multiplexer 132 that outputs to the receiver 23 and a phase shift and amplification of the transmission signal from the demultiplexer 131 at the timing of transmission and outputs to the radiating element 11 and a part of the transmission signal to the multiplexer 132. In return and reception timing, a plurality of transmission / reception modules 12 that perform phase shift and amplification of the reception signal from the radiation element 11 and output to the multiplexer 132, and transmission and reception of the transmission signal connected to each transmission / reception module 12 from the target And a plurality of radiating elements 11 for receiving reflected waves.

  The transmission / reception module 12 demultiplexes the transmission signal and transmits the main signal, a transmission phase shifter 1211 that shifts the phase of the transmission signal from the demultiplexer 131, a transmission amplifier 123 that amplifies the transmission signal, and the like. A demultiplexer 128 that turns the route and returns a part of the transmission signal to the receiving side, a switch 124 that switches between transmission to the radiation element 11 and reception from the radiation element 11, a terminator 126, a terminator 126, and radiation A switch 125 for switching reception from the element 11, a switch 129 for switching a folded transmission signal from the duplexer 128 and a reception signal from the radiating element 11, and reception for amplifying the reception signal or the folded transmission signal And a reception phase shifter 1212 for performing phase shift of the reception signal amplified by the amplifier 127 or the folded transmission signal.

  The electric circuit section 2 transmits a chirp signal generator 21 that generates a transmission signal, and frequency conversion and amplification of the generated transmission signal and outputs to the duplexer 131 of the phased array antenna 1 via the transmission dedicated antenna cable 32. The reception signal of the reflected wave from the target received from the multiplexer 22 and the multiplexer 132 of the phased array antenna 1 via the reception-only antenna cable 33 or the transmission signal turned back in the transmission / reception module 12 is input. The receiver 23 that performs frequency conversion and amplification and outputs the data to the data processing device 24, the data processing device 24 that performs sampling and processing of signals input from the receiver, and the data processing device performs sampling and processing. Data recorder 25 for recording digital data, phased array antenna 1 and electricity And a control unit 26 for controlling each device in the road section 2.

  FIG. 2 is an operation timing chart of the phased array antenna radar according to the present embodiment. FIGS. 3 and 4 illustrate signal flows and reception timings at the transmission timing (timing for transmitting a transmission wave) according to the present embodiment. The signal flow at the timing of receiving the reflected wave from the target is shown. Hereinafter, the operation of the present embodiment will be described with reference to FIGS.

  The transmission wave from the phased array antenna 1 is emitted at a constant pulse repetition period. In the present embodiment, a transmission signal that is turned back at the same timing is received. Thereafter, the reflected wave is received from the target at a timing between transmissions.

  The transmission signal generated by the chirp signal generator 21 is frequency-converted and amplified by the transmitter 22 and output to the duplexer 131 on the phased array antenna 1 side via the transmission-dedicated antenna cable 32. The demultiplexer 131 demultiplexes the input transmission signal to the plurality of transmission / reception modules 12. Each transmission / reception module 12 performs radiation from the phased array antenna 1 by performing a predetermined phase shift and amplification for each transmission / reception module on the demultiplexed transmission signal and outputting the result to the radiation element 11. At this time, the switch 124 in the transmission / reception module 12 sets a route connecting the duplexer 128 and the radiating element 11.

  Simultaneously with the radiation of the transmission wave, a part of the transmission signal phase-shifted and amplified by the phase shifter 1211 and the amplifier 123 in the transmission / reception module 12 is demultiplexed by the demultiplexer 128 in the transmission / reception module 12 and received by the receiving side. Wrapped to Therefore, the switch 125 in the transmission / reception module 12 at this time sets a route connecting the terminator 126 and the switch 129, and the switch 129 is controlled to set a route connecting the duplexer and the amplifier 127.

  The folded transmission signal (calibration signal) is amplified and phase-shifted by the amplifier 127 and the phase shifter 1212 in the transmission / reception module 12 and output to the multiplexer 132. The multiplexer 132 multiplexes the transmission signal (calibration signal) returned by each transmission / reception module 12 and outputs it to the receiver 23 via the reception-specific antenna cable 33. The receiver 23 performs frequency conversion and amplification of the input transmission signal (calibration signal), and the data processing device 24 performs sampling and sampling of the frequency conversion and amplified transmission signal (calibration signal) and performs various processes. Record in the data recorder as digitized calibration signal.

  On the other hand, at the reception timing between the transmission pulse repetition periods, the respective switches 124, 125, and 129 in the transmission / reception module are controlled to be set to a route connecting the radiation element 11 to the amplifier 127. Therefore, the reception signal received by the radiating element 11 is amplified and phase-shifted by the amplifier 127 and the phase shifter 1212 in the transmission / reception module 12 in the transmission / reception module 12 and output to the multiplexer 132. The multiplexer 132 multiplexes the reception signals amplified and phase-shifted by the respective transmission / reception modules 12 and outputs them to the receiver 23 via the reception-dedicated antenna cable 33.

  The receiver 23 performs frequency conversion and amplification of the input received signal, and the data processing device 24 samples the received signal that has been subjected to frequency conversion and amplification, performs various processes, and then converts the received signal into a data recorder. To record.

  The calibration signal recorded in the data recorder at the transmission timing is used as a reference function for reproducing the reception signal recorded in the data recorder at the reception timing. Further, by analyzing the calibration signal data, the phase / amplitude characteristics of the apparatus according to the present invention are analyzed and used for calibration. Further, by checking the level, it is possible to perform level analysis of the entire apparatus including the transmission power level of the present apparatus and to perform radiometric calibration of the received signal.

  Further, in the above embodiment, a part of the transmission chirp signal transmitted at the transmission timing in the observation mode is demultiplexed to receive the folded transmission chirp signal, and the data is processed to obtain the calibration signal. However, it is generated by the chirp signal generator even if the calibration mode is set and the transmission chirp signal is transmitted, only the folded transmission chirp signal is received and data processing is performed to obtain the calibration signal. Since the transmission chirp signal is folded back in the transmission / reception module, transmission chirp signal information closer to the actual transmission wave including the RF characteristics of the transmission / reception module can be acquired.

  5 to 7 show an example in the case of confirming the operation of each transmission / reception module in the phased array antenna radar of the present embodiment, FIG. 5 shows the signal flow, and FIGS. The timing chart is shown.

  When checking the operation of each transmission / reception module, as shown in FIG. 5, except for one of the plurality of transmission / reception modules 12, the amplifiers 123 and 124 are turned off (signals are not amplified). Accordingly, a part of the transmission signal returned from only one of the transmission signals input from the duplexer 131 to the transmission / reception module 12 is output as a calibration signal to the multiplexer 132, and the receiver 23, the data processing device 24 and recorded in the data recorder.

  In the recording operation, the calibration signals from all the transmission / reception modules 12 are recorded in the data recorder by sequentially switching one transmission / reception module 12 as shown in the timing of FIG. Then, by analyzing the calibration signal from each transmission / reception module 12 recorded in the data recorder and confirming the level, the normal operation of each transmission / reception module 12 can be confirmed. Therefore, according to the phased array antenna radar of the present embodiment, there is an effect that it is possible to check the operation of each transmission / reception module, which was not possible with the prior art.

  At this time, the setting of the phase shift amount of the phase shifters 1211 and 1212 may be changed one after another as shown in the timing of FIG. Then, by confirming the phase of the calibration signal recorded in the data recorder, the normal operation of each phase shifter can be confirmed. Furthermore, there is an effect that the antenna pattern formed by the phased array antenna can be optimized by confirming the phase of each phase shifter and setting an appropriate phase again based on the confirmation result.

  FIG. 8 is a block configuration diagram showing an example in the case of performing on-board calibration in the phased array antenna radar of the present embodiment.

  In this embodiment, the calibration signal data sampled and processed by the data processing device 24 in the embodiment shown in FIG. 1 is output to the control device 26 by the signal cable 27, and the calibration signal data is analyzed by the control device 26. Thus, the operation state of the device is grasped, and when an abnormality occurs, the control device 26 performs measures such as stop control of the device.

  According to the present embodiment, it is possible to quickly cope with the occurrence of an abnormality in the apparatus, and there is an effect that it is possible to avoid the propagation of a secondary failure.

  Further, in combination with the phase confirmation of the phase shifter of the embodiment of FIG. 7, the phase amount of the phase shifter in each transmission / reception module is confirmed, and the controller 26 automatically resets the appropriate phase so that real time Thus, the antenna pattern formed by the phased array antenna can be optimized.

  8, the calibration signal is output from the data processing device 24 to the control device 26. However, the calibration signal may be output from the data recorder 25 to the control device 26.

It is a block block diagram of the phased array antenna radar which shows embodiment of this invention. It is an operation | movement timing chart of the phased array antenna radar of this embodiment. It is a figure which shows the flow of the signal in the transmission timing (timing which radiates | emits a transmission wave) of this embodiment. It is a figure which shows the flow of a signal in the reception timing (timing which receives the reflected wave from a target) of this embodiment. It is a figure which shows the Example in the case of confirming the operation | movement of each transmission / reception module in the phased array antenna radar of this embodiment. It is a timing chart which shows the Example in the case of confirming the operation | movement of each transmission / reception module in the phased array antenna radar of this embodiment. It is a timing chart which shows the Example in the case of confirming the operation | movement of each transmission / reception module in the phased array antenna radar of this embodiment. It is a block block diagram which shows the Example in the case of performing on-board calibration in the phased array antenna radar of this embodiment. It is a block block diagram of the phased array antenna radar which shows a prior art example. 10 is an operation timing chart of the phased array antenna radar shown in FIG. 9.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Phased array antenna 2 Electric circuit part 11 Radiation element 12 Transmission / reception module 13 Demultiplexer / multiplexer 21 Chirp signal generator 22 Transmitter 23 Receiver 24 Data processing device 25 Data recorder 26 Control device 27 Signal cable 31 Transmission / reception antenna cable 32 Transmission Dedicated antenna cable 33 Dedicated antenna cable 121, 1211, 1212 Phase shifters 122, 124, 125, 129, 222, 233 Switch 123, 127 Amplifier 126 Terminator 128 Demultiplexer 131 Demultiplexer 132 Multiplexer 221 231 Frequency Converter / Amplifier 232 Attenuator

Claims (12)

A calibration signal acquisition method in a phased array antenna radar comprising a plurality of radiating elements and a phased array antenna having a plurality of transmission / reception modules respectively provided corresponding to the plurality of radiating elements,
A part of the transmission chirp signal phase-shifted and amplified by the transmission phase shifter and transmission amplifier in each transmission / reception module for radiating from each of the radiating elements is demultiplexed, and the demultiplexed transmission chirp signal is In the phased array antenna radar, wherein the signal is looped back via a receiving amplifier and a receiving phase shifter in each transmitting / receiving module, the looped transmission chirp signal is received, processed, and recorded as a calibration signal. Calibration signal acquisition method.   2. A calibration signal acquisition method in a phased array antenna radar according to claim 1, wherein a part of the transmission chirp signal transmitted at the transmission timing in the observation mode is demultiplexed to obtain the folded transmission chirp signal. .   The phased array antenna radar according to claim 1, wherein a calibration mode is set, the transmission chirp signal is transmitted, only the folded transmission chirp signal is received, data processing is performed, and the calibration signal is obtained. Calibration signal acquisition method.   The transmission chirp signal returned from all of the plurality of transmission / reception modules is multiplexed, and the combined signal is subjected to data processing to obtain a calibration signal. Calibration signal acquisition method for the phased array antenna radar.   Set the operation check mode, operate only one of the plurality of transmission / reception modules to acquire the calibration signal, and sequentially acquire one of the transmission / reception modules by switching the transmission / reception module. The transmission / reception using the calibration signal acquisition method in the phased array antenna radar according to claim 1, wherein the normal operation of each of the transmission / reception modules is confirmed by analyzing the calibration signal. How to check module operation.   4. The calibration signal acquisition method for a phased array antenna radar according to claim 3, wherein the normal operation of each transmission / reception module is confirmed by analyzing the level of the calibration signal acquired from each transmission / reception module. Operation confirmation method of used transceiver module.   Check the normal operation of each transceiver module by changing the phase shift amount of the phase shifter in each transceiver module one after another and analyzing the phase of the calibration signal acquired for each changed phase shift amount The method for confirming the operation of the transmission / reception module using the calibration signal acquisition method in the phased array antenna radar according to claim 3. In a phased array antenna radar including a plurality of radiating elements and a phased array antenna having a plurality of transmission / reception modules respectively provided corresponding to the plurality of radiating elements,
A function of demultiplexing a part of the transmission chirp signal phase-shifted and amplified by the transmission phase shifter and transmission amplifier provided in each of the transmission / reception modules, and a part of the demultiplexed transmission chirp signal A function of looping back via a reception amplifier and a phase shifter for reception provided in each of the transmission / reception modules, and a function of generating a calibration signal by receiving the looped transmission chirp signal and processing the data A phased array antenna radar characterized by In a phased array antenna radar including a plurality of radiating elements and a phased array antenna having a plurality of transmission / reception modules respectively provided corresponding to the plurality of radiating elements,
A chirp signal generator, a transmitter for frequency-converting and amplifying the transmission chirp signal generated by the chirp signal generator and outputting it as a transmission pulse, and the transmission pulse output from the transmitter to the phased array antenna A transmission-dedicated antenna cable for transmission, a duplexer provided in the phased-array antenna and demultiplexing the transmission pulse input via the transmission-dedicated antenna cable to the plurality of transmission / reception modules, and the phased-array antenna The plurality of transmission / reception modules that are included in the plurality of transmission / reception modules and that are partly folded in the plurality of transmission / reception modules and that are received by the plurality of radiating elements as reflected waves with respect to the radiation by the transmission pulses. A multiplexer that multiplexes the received signal output from, and the output from the multiplexer A dedicated reception antenna cable for transmitting the combined folded transmission pulse and the combined received signal to the receiver, and frequency conversion of the combined folded transmission pulse and the combined received signal input through the dedicated antenna cable, respectively. And the receiver that amplifies, and the combined return transmission pulse that is frequency-converted and amplified by the receiver is processed to generate a calibration signal, and the combined-received signal that is frequency-converted and amplified by the receiver A data processing device for processing received data and generating a route for generating the calibration signal in synchronization with the transmission timing of the transmission pulse, and the reception data at the reception timing during the transmission pulse repetition period. A phased array antenna comprising: a control device configured to control to set a route to be generated Radar.   The transmission / reception module includes: a transmission phase shifter that shifts a phase of the transmission pulse input from the duplexer; a transmission amplifier that amplifies the transmission pulse phase-shifted by the transmission phase shifter; A duplexer that outputs the transmission pulse amplified by the transmission amplifier to the radiator side and demultiplexes a part thereof, a transmission route to the radiation element and a reception route from the radiation element are switched. When the first switch and the first switch are switched to the reception route, the reception signal from the radiator is input to the reception amplifier, and the first switch is switched to the transmission route. Sometimes the second switch for switching to input a part of the transmission pulse demultiplexed by the demultiplexer to the receiving amplifier, and the received signal amplified by the receiving amplifier or the Phased array antenna radar according to claim 9, characterized in that a part of the signal pulses with a phase shift and a reception phase shifter for outputting to the multiplexer.   The control device has a function of operating only one of the plurality of transmission / reception modules to acquire the calibration signal, a function of sequentially switching one transmission / reception module to be operated, and the acquisition from each transmission / reception module The phased array antenna radar according to claim 9 or 10, wherein the phased array antenna radar has a function of analyzing the calibration signal and determining a normal operation of each of the transmission / reception modules.   The control device analyzes the generated calibration signal data to determine the operation state of the phased array antenna radar, and performs a function to control the operation of the phased array antenna radar when it is determined to be abnormal. The phased array antenna radar according to claim 9, wherein the phased array antenna radar is provided.

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