JPH08194056A - Range finding radar - Google Patents
Range finding radarInfo
- Publication number
- JPH08194056A JPH08194056A JP7006482A JP648295A JPH08194056A JP H08194056 A JPH08194056 A JP H08194056A JP 7006482 A JP7006482 A JP 7006482A JP 648295 A JP648295 A JP 648295A JP H08194056 A JPH08194056 A JP H08194056A
- Authority
- JP
- Japan
- Prior art keywords
- output
- signal
- amplitude
- intermediate frequency
- modulation
- Prior art date
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Links
- 230000001360 synchronised effect Effects 0.000 claims abstract description 28
- 238000001514 detection method Methods 0.000 claims description 23
- 230000005540 biological transmission Effects 0.000 claims description 16
- 238000005311 autocorrelation function Methods 0.000 claims description 5
- 238000005314 correlation function Methods 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000001228 spectrum Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000002592 echocardiography Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Radar Systems Or Details Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、目標に電波を照射し、
反射してくる電波を受信して目標までの距離を計測する
ことを目的とする測距レーダに関するものである。TECHNICAL FIELD The present invention irradiates a target with radio waves,
The present invention relates to a range-finding radar that receives reflected radio waves and measures the distance to a target.
【０００２】[0002]
【従来の技術】図４は測距レーダの従来例であり、図に
おいて、１は送信源、２は送信信号に疑似ランダム符号
系列を使用して０，πの２位相変調あるいは平衡変調を
かける第１の位相変調器、３は前記変調された信号を増
幅する送信機、４は送信機３で増幅された信号を送信す
る送信アンテナ、５は目標からの反射した信号を受信す
る受信アンテナ、６は受信信号を分配する電力分配器、
７は電力分配器６により分配された受信信号と第２の位
相変調器１４より出力された復調用信号との掛け算操作
を実施し自己相関関数を振幅とする中間周波信号を出力
する第１の復調器、８は第１の復調器７で復調された信
号を増幅する第１の中間周波増幅器、９は第１の中間周
波増幅器８で増幅された信号を振幅検波する振幅検波
器、１０は電力分配器６により分配された受信信号と第
３の位相変調器１５より出力された復調用信号との掛け
算操作を実施し自己直交相関関数を振幅とする中間周波
信号を出力する第２の復調器、１１は第２の復調器１０
で復調された信号を増幅する第２の中間周波増幅器、１
２は自己相関関数の出力である中間周波増幅器８と自己
直交相関関数の出力である第２の中間周波増幅器１１の
信号より掛け算検波あるいはＦＥＴ検波によって得られ
る同期誤差信号を求める同期検波器、１３は変復調用信
号を発生させる変復調用信号発生器、１４は変復調用信
号発生器１３で作られる疑似ランダム符号系列を用いて
第１の復調器７への復調信号を出力する第２の位相変調
器、１５は目標との同期を維持するために変復調用信号
発生器１３で作られる疑似ランダム符号系列と直交して
いる疑似ランダム符号系列を用いて第２の復調器１０へ
の復調信号を出力する第３の位相変調器、１６は局部発
振器である。2. Description of the Related Art FIG. 4 shows a conventional example of a range-finding radar. In the figure, 1 is a transmission source, and 2 is a pseudo-random code sequence for a transmission signal to apply two-phase modulation of 0, π or balanced modulation. The first phase modulator, 3 is a transmitter for amplifying the modulated signal, 4 is a transmitting antenna for transmitting the signal amplified by the transmitter 3, 5 is a receiving antenna for receiving the reflected signal from the target, 6 is a power distributor for distributing received signals,
Reference numeral 7 denotes a first output for outputting an intermediate frequency signal having an autocorrelation function as an amplitude by performing a multiplication operation of the reception signal distributed by the power distributor 6 and the demodulation signal output by the second phase modulator 14. A demodulator, 8 is a first intermediate frequency amplifier for amplifying the signal demodulated by the first demodulator 7, 9 is an amplitude detector for amplitude detecting the signal amplified by the first intermediate frequency amplifier 8, and 10 is Second demodulation for performing an operation of multiplying the reception signal distributed by the power distributor 6 and the demodulation signal output by the third phase modulator 15 to output an intermediate frequency signal having an amplitude of a self-quadrature correlation function And 11 is the second demodulator 10
A second intermediate frequency amplifier for amplifying the signal demodulated by
Reference numeral 2 is a synchronous detector for obtaining a synchronous error signal obtained by multiplication detection or FET detection from the signals of the intermediate frequency amplifier 8 which is the output of the autocorrelation function and the second intermediate frequency amplifier 11 which is the output of the self-quadrature correlation function, 13 Is a modulation / demodulation signal generator that generates a modulation / demodulation signal, and 14 is a second phase modulator that outputs a demodulation signal to the first demodulator 7 using the pseudo-random code sequence generated by the modulation / demodulation signal generator 13. , 15 output a demodulation signal to the second demodulator 10 by using a pseudo-random code sequence that is orthogonal to the pseudo-random code sequence created by the modulation / demodulation signal generator 13 in order to maintain synchronization with the target. The third phase modulator 16 is a local oscillator.
【０００３】従来の測距レーダは上記のように構成され
ている。送信源１の出力信号である送信源出力１１１は
第１の位相変調器２において変復調用信号発生器１３の
出力である変調用信号１１２を用いて２位相変調あるい
は平衡変調されて第１の位相変調器出力１１３となり、
送信機３に入力され増幅されて送信機出力１１４とな
り、送信アンテナ４により送信信号１１５となって目標
に送信される。目標よりの反射波である受信信号１１６
は受信アンテナ５で受信され受信アンテナ出力１１７と
なり、電力分配器６に入力され、受信信号の電力が分配
されて電力分配器の第１の出力１１８及び電力分配器の
第２の出力１２２となる。The conventional distance measuring radar is constructed as described above. The transmission source output 111, which is the output signal of the transmission source 1, is two-phase modulated or balanced-modulated using the modulation signal 112, which is the output of the modulation / demodulation signal generator 13, in the first phase modulator 2 to obtain the first phase. It becomes the modulator output 113,
The signal is input to the transmitter 3 and amplified to become a transmitter output 114, and a transmission signal 115 is transmitted by the transmission antenna 4 to the target. Received signal 116 that is a reflected wave from the target
Is received by the receiving antenna 5 and becomes the receiving antenna output 117, is input to the power distributor 6, and the power of the received signal is distributed to become the first output 118 of the power distributor and the second output 122 of the power distributor. .
【０００４】電力分配器の第１の出力１１８は第１の復
調器７において第２の位相変調器１４の出力である第１
の復調用信号１２８を復調用信号として掛け算操作をさ
れて自己相関関数を振幅とする中間周波信号である第１
の復調器出力１１９となり、第１の中間周波増幅器８に
入力され増幅されて、第１の中間周波増幅器出力１２０
となり、第１の中間周波増幅器出力１２０の一方の出力
は同期検波器１２に入力される。電力分配器６の他方の
出力である電力分配器の第２の出力１２２は第２の復調
器１０において第３の位相変調器１５の出力である第２
の復調用信号１２９を復調用信号として掛け算操作され
て自己直交相関関数を振幅とする中間周波信号である第
２の復調器出力１２３となり、第２の中間周波増幅器１
１に入力され増幅されて第２の中間周波増幅器出力１２
４となり、第２の中間周波増幅器出力１２４は同期検波
器１２に入力され第１の中間周波増幅器出力１２０と掛
け算検波あるいはＦＥＴ検波によって得られる同期のた
めの誤差信号である同期検波出力１２５となり、変復調
用信号発生器１３に入力される。The first output 118 of the power divider is the output of the second phase modulator 14 in the first demodulator 7
Which is an intermediate frequency signal having an autocorrelation function as an amplitude, which is subjected to a multiplication operation using the demodulation signal 128 of 1.
Output to the first intermediate frequency amplifier 8 and is amplified by the first intermediate frequency amplifier 8 to output the first intermediate frequency amplifier output 120.
Therefore, one output of the first intermediate frequency amplifier output 120 is input to the synchronous detector 12. The second output 122 of the power distributor, which is the other output of the power distributor 6, is the second output of the third phase modulator 15 in the second demodulator 10.
Is demodulated as a demodulation signal 129 to be a second demodulator output 123 which is an intermediate frequency signal having an amplitude of the auto-orthogonal correlation function, and the second intermediate frequency amplifier 1
The second intermediate frequency amplifier output 12
4 and the second intermediate frequency amplifier output 124 is input to the synchronous detector 12 and becomes the synchronous detection output 125 which is an error signal for synchronization obtained by multiplication detection or FET detection with the first intermediate frequency amplifier output 120, The signal is input to the modulation / demodulation signal generator 13.
【０００５】変復調用信号発生器１３の出力である復調
用第１の信号１２６は局部発振器１６の出力である局部
発振器出力１３０の変調用信号となり、第２の位相変調
器１４において位相変調されて第１の復調用信号１２８
となる。変復調用信号発生器１３の他方の出力である復
調用第２の信号１２７は局部発振器出力１３０の変調用
信号となり、第３の位相変調器１５において位相変調さ
れて第２の復調用信号１２９となる。第１の中間増幅器
出力１２０の他方の出力は振幅検波器９に入力され、こ
こで振幅検波されて振幅検波器出力１２１となり、目標
の検出に使用される。The demodulation first signal 126 which is the output of the modulation and demodulation signal generator 13 becomes a modulation signal of the local oscillator output 130 which is the output of the local oscillator 16 and is phase-modulated in the second phase modulator 14. First demodulation signal 128
Becomes The second demodulation signal 127, which is the other output of the modulation / demodulation signal generator 13, becomes a modulation signal of the local oscillator output 130, and is phase-modulated by the third phase modulator 15 to generate the second demodulation signal 129. Become. The other output of the first intermediate amplifier output 120 is input to the amplitude detector 9, where it is amplitude-detected to become the amplitude detector output 121, which is used for detecting the target.
【０００６】[0006]
【発明が解決しようとする課題】従来の測距レーダは以
上のように構成されているので、目標との同期捕捉のた
めに外部から初期距離を必要とする。特に高繰り返しド
ップラレーダにおいては、目標からのエコーの折り返し
が狭い間隔で発生するために特に正確な距離情報を必要
とする。符号変調をかけた測距レーダの場合、目標のエ
コーの折り返しは符号長間隔で現れるが、パルス幅おき
にサイドローブが発生する。このサイドローブが目標検
出レベルよりも大きい場合は、虚像の目標に誤ロックオ
ンする場合が存在する。それを防止するためには符号長
分の目標検出を実施しその中で最大振幅のものを選択し
同期をとる方法がある。しかし、この場合、符号長分の
目標検出を必要とするために同期捕捉に時間がかかると
いう問題点があった。Since the conventional range-finding radar is constructed as described above, it requires an initial distance from the outside for synchronous acquisition with the target. Particularly in a high-repetition Doppler radar, particularly accurate distance information is required because the echoes from the target are reflected at narrow intervals. In the case of a ranging radar with code modulation, target echoes appear at code length intervals, but side lobes occur at every pulse width. When this side lobe is larger than the target detection level, there is a case where the lock-on is erroneously performed on the virtual image target. In order to prevent this, there is a method in which target detection for the code length is carried out and the one with the maximum amplitude is selected for synchronization. However, in this case, there is a problem that it takes time for the synchronization acquisition because the target detection for the code length is required.
【０００７】この発明は上記のような問題点を解消する
ためになされたもので、現状のハードウェアをもとにし
ているために小型でかつ、同期捕捉のための時間が上記
の半分以下にすることを目的としている。The present invention has been made in order to solve the above problems, and is small in size because it is based on the current hardware, and the time for synchronization acquisition is less than half of the above. The purpose is to do.
【０００８】[0008]
【課題を解決するための手段】この発明に係る測距レー
ダは、目標検出系と同期維持系を同期捕捉時には、同期
維持系も目標検出系として使用することにより目標検出
系を２系統としたものである。In the ranging radar according to the present invention, when the target detection system and the synchronization maintenance system are synchronously captured, the synchronization maintenance system is also used as the target detection system so that the target detection system has two systems. It is a thing.
【０００９】[0009]
【作用】この発明における測距レーダは、同期捕捉時に
目標検出系を２系統とし、同期捕捉後は、１系統を目標
検出系もう１系統を同期維持系にしようすることにより
目標検出系の系を増やすことなしに同期捕捉時間を半分
以下とする。The range finding radar according to the present invention uses two target detection systems at the time of synchronous acquisition, and after the synchronous acquisition, one system is used as the target detection system and the other system is used as the synchronization maintaining system. The acquisition time is reduced to less than half without increasing.
【００１０】[0010]
実施例１．以下、この発明の一実施例を図について説明
する。図１において、１〜１６は上記従来装置と全く同
一のものである。１７は第２の中間周波増幅器出力信号
をモード制御器２２の信号により第２の振幅検波器１８
に出力するか同期検波器１２に出力するかを切り換える
第１の切り換え回路、１８は同期捕捉時に振幅検波する
第２の振幅検波器、１９は第１の振幅検波器９と第２の
振幅検波器１８からの出力を比較する振幅比較器、２０
は第２の位相変調器１４からの復調信号にパルス幅繰り
返し周期のディレイをかけるディレイ回路、２１はモー
ド制御器２２の信号によりディレイ回路２０の信号また
は第３の位相変調器１５の信号かを切り換えて第２の復
調器に出力する第２の切り換え回路、２２は振幅比較器
１９によって比較された振幅が最大でかつ目標検出レベ
ル以上のものがある場合、距離ゲートの位置を出力し、
モードを追随に移行させ第１、第２の切り換え回路１
７，２１に同期維持信号を出力するモード制御器であ
る。Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 to 16 are exactly the same as those of the conventional device. Reference numeral 17 designates a second intermediate frequency amplifier output signal as a second amplitude detector 18 by a signal of the mode controller 22.
To a synchronous detector 12 or a first switching circuit for switching to the synchronous detector 12, a reference numeral 18 for a second amplitude detector for amplitude detection at the time of synchronous acquisition, and a reference numeral 19 for a first amplitude detector 9 and a second amplitude detector. An amplitude comparator for comparing the output from the comparator 18, 20
Is a delay circuit for delaying the demodulated signal from the second phase modulator 14 with a pulse width repetition period, and 21 is a signal of the delay circuit 20 or a signal of the third phase modulator 15 depending on the signal of the mode controller 22. A second switching circuit for switching and outputting to the second demodulator, 22 outputs the position of the distance gate when the amplitude compared by the amplitude comparator 19 is maximum and is higher than the target detection level,
First and second switching circuit 1 for switching modes
This is a mode controller that outputs a synchronization maintaining signal to 7, 21.
【００１１】前記のように構成された測距レーダにおい
て、送信源１の出力信号である送信源出力１１１は第１
の位相変調器２において変復調用信号発生器１３の出力
である変調用信号１１２を用いて２位相変調あるいは平
衡変調されて第１の位相変調器出力１１３となり、送信
機３に入力され増幅されて送信機出力１１４となり、送
信アンテナ４より送信信号１１５となって目標に送信さ
れる。目標よりの反射波である受信信号１１６は受信ア
ンテナ５で受信され受信アンテナ出力１１７となり、電
力分配器６に入力され、受信信号の電力が分配されて電
力分配器の第１の出力１１８及び電力分配器の第２の出
力１２２となる。In the distance measuring radar configured as described above, the transmission source output 111, which is the output signal of the transmission source 1, is the first
In the phase modulator 2, the modulation signal 112, which is the output of the modulation / demodulation signal generator 13, is used for two-phase modulation or balanced modulation to become the first phase modulator output 113, which is input to the transmitter 3 and amplified. It becomes the transmitter output 114 and becomes the transmission signal 115 from the transmission antenna 4 and is transmitted to the target. The reception signal 116, which is a reflected wave from the target, is received by the reception antenna 5 and becomes the reception antenna output 117, is input to the power distributor 6, and the power of the reception signal is distributed to the first output 118 and the power of the power distributor. This is the second output 122 of the distributor.
【００１２】電力分配器の第１の出力１１８は第１の復
調器７において第２の位相変調器１４の出力である第１
の復調用信号１２８を復調用信号として掛け算操作を実
施し、自己相関関数を振幅とする中間周波信号である第
１の復調器出力１１９となり、第１の中間周波増幅器８
に入力され増幅されて、第１の中間周波増幅器出力１２
０となり、第１の中間周波増幅器出力１２０の一方の出
力は同期検波器１２に入力される。電力分配器６の他方
の出力である電力分配器の第２の出力１２２は第２の復
調器１０において第２の切り換え回路２１の出力である
第２の復調用信号１３８を復調用信号として掛け算操作
を実施し、自己直交相関関数を振幅とする中間周波信号
である第２の復調器出力１２３となり、第２の中間周波
増幅器出力１１に入力され増幅されて第２の中間周波増
幅器出力１２４となり、第２の中間周波増幅器出力１２
４は第１の切り換え回路１７に入力される。The first output 118 of the power distributor is the output of the second phase modulator 14 in the first demodulator 7
The demodulation signal 128 is used as a demodulation signal to perform a multiplication operation, and the first demodulator output 119 which is an intermediate frequency signal having an autocorrelation function as an amplitude is obtained.
Is input to and amplified by the first intermediate frequency amplifier output 12
It becomes 0, and one output of the first intermediate frequency amplifier output 120 is input to the synchronous detector 12. The second output 122 of the power distributor, which is the other output of the power distributor 6, is multiplied by the second demodulation signal 138, which is the output of the second switching circuit 21, in the second demodulator 10 as a demodulation signal. The second demodulator output 123, which is an intermediate frequency signal having an amplitude of the auto-orthogonal correlation function, is obtained by performing the operation, is input to the second intermediate frequency amplifier output 11, is amplified, and becomes the second intermediate frequency amplifier output 124. , Second intermediate frequency amplifier output 12
4 is input to the first switching circuit 17.
【００１３】第１の切り換え回路１７ではモード制御器
２２の信号により同期捕捉時には、第２の振幅検波器１
８に第２の中間周波増幅器捕捉出力１３１として出力
し、同期維持時には同期検波器１２に第２の中間増幅器
同期出力１３２として出力する。同期検波器１２は同期
維持時に第１の切り換え回路１７から出力される第２の
中間増幅器同期出力１３２を第１の中間周波増幅器出力
１２０と掛け算検波あるいはＦＥＴ検波によって得られ
る同期のための誤差信号である同期検波出力１２５とな
り変復調用信号発生器１３に入力される。The first switching circuit 17 uses the signal from the mode controller 22 to acquire the second amplitude detector 1 when synchronization is acquired.
8 as a second intermediate frequency amplifier capture output 131, and outputs to the synchronous detector 12 as a second intermediate amplifier synchronization output 132 when maintaining synchronization. The synchronous detector 12 is an error signal for synchronization obtained by multiplication detection or FET detection of the second intermediate amplifier synchronization output 132 output from the first switching circuit 17 when the synchronization is maintained and the first intermediate frequency amplifier output 120. Is output as the synchronous detection output 125 and is input to the modulation / demodulation signal generator 13.
【００１４】変復調用信号発生器１３の出力である復調
用第１の信号１２６は第２の位相変調器１４において局
部発振器１６の出力である局部発振器出力１３０の変調
用信号となり、第２の位相変調器１４において位相変調
されて第１の復調用信号１２８となる。第１の復調用信
号１２８の一方は第１の復調器へ、他方の出力はディレ
イ回路２０に入力される。ディレイ回路２０はパルス繰
り返し周期だけディレイをかける。復調用第２の信号１
２７は局部発振器出力１３０の変調用信号となり、第３
の位相変調器１５において位相変調されて第３の位相変
調器出力１２９となる。第２の切り換え回路２１はモー
ド制御器２２の信号により同期捕捉時にはディレイ回路
出力１３８を、同期維持時には第３の位相変調器出力１
２９を第２の復調器１０に入力させる。The demodulation first signal 126 which is the output of the modulation and demodulation signal generator 13 becomes the modulation signal of the local oscillator output 130 which is the output of the local oscillator 16 in the second phase modulator 14, and the second phase is obtained. The phase is modulated in the modulator 14 to become the first demodulation signal 128. One of the first demodulation signals 128 is input to the first demodulator, and the output of the other is input to the delay circuit 20. The delay circuit 20 delays by a pulse repetition period. Second signal for demodulation 1
27 is the modulation signal of the local oscillator output 130,
Is phase-modulated by the phase modulator 15 of FIG. The second switching circuit 21 uses the signal from the mode controller 22 to output the delay circuit output 138 when the synchronization is acquired, and the third phase modulator output 1 when the synchronization is maintained.
29 is input to the second demodulator 10.
【００１５】第１の中間増幅器出力１２０の他方の出力
は第１の振幅検波器９に入力され、ここで振幅検波され
て第１の振幅検波器出力１２１となり、目標の検出に使
用される。同期捕捉時、第１の切り換え回路出力１３１
は第２の振幅検波器１８に入力され振幅検波され振幅比
較器１９に入力される。振幅比較器１９は第１の振幅検
波器出力１２１と第２の振幅検波器出力１３３を比較し
振幅比較器出力１３４としてモード制御器２２に出力す
る。モード制御器２２は所定の捕捉パターン終了時、振
幅結果が最大でかつ目標検出レベルを越えるものが存在
した場合、モードを捕捉から追随にかえモード制御信号
１３５として第１の切り換え回路１７及び第２の切り換
え回路２１に入力する。また振幅の大きいゲートを真の
距離からの目標のエコーとして選択し、距離ゲートの位
置を振幅比較器出力１３６として変復調用信号発生器１
３に出力する。以上の説明を簡易のタイミングチャート
で示すと図２のようになる。The other output of the first intermediate amplifier output 120 is input to the first amplitude detector 9, where it is amplitude-detected to become the first amplitude detector output 121, which is used for detecting the target. The first switching circuit output 131 during synchronization acquisition
Is input to the second amplitude detector 18, which is subjected to amplitude detection and input to the amplitude comparator 19. The amplitude comparator 19 compares the first amplitude detector output 121 and the second amplitude detector output 133 and outputs it as the amplitude comparator output 134 to the mode controller 22. At the end of the predetermined capture pattern, the mode controller 22 changes the mode from capture to follow and outputs the first switching circuit 17 and the second switching circuit 17 when the amplitude result is maximum and exceeds the target detection level. Input to the switching circuit 21. Also, a gate with a large amplitude is selected as a target echo from the true distance, and the position of the distance gate is used as the amplitude comparator output 136 for the modulation / demodulation signal generator 1.
Output to 3. The above explanation is shown in FIG. 2 by a simple timing chart.
【００１６】ここで図３のように、２位相変調の符号系
列をＭコード３ビットの場合を考える。符号長３の受信
信号に対してａ，ｂ，ｃのように３パターンの復調が考
えられ、そのときの目標の振幅はａ１，ｂ１，ｃ１のよ
うになる。このとき、従来の測距レーダにおいては、同
期捕捉時ａ，ｂ，ｃの３回の復調を実施しなければなら
ないのの対して、この発明においては、１回の復調で
ａ，ｂを実施することができ、第１の振幅検波器９と第
２の振幅検波器１８の振幅を比較して振幅が約３倍の差
であれば大きい方の振幅が真の距離を表しており、ほぼ
等しければｃが真の距離であるというように１回の復調
で真の距離を捕捉することができる。Here, as shown in FIG. 3, let us consider a case where the code sequence for two-phase modulation is M code 3 bits. It is conceivable to demodulate three patterns such as a, b, and c for a received signal of code length 3, and the target amplitudes at that time are a1, b1, and c1. At this time, in the conventional range-finding radar, demodulation a, b, and c must be performed three times at the time of synchronous acquisition, whereas in the present invention, a and b are performed once in the demodulation. It is possible to compare the amplitudes of the first amplitude detector 9 and the second amplitude detector 18, and if the amplitude is a difference of about 3 times, the larger amplitude represents the true distance, and If they are equal, it is possible to capture the true distance in one demodulation, such that c is the true distance.
【００１７】ところで上記説明では、疑似ランダム符号
をＭコード３ビットで述べたが、符号系列は何でもよ
く、かつ符号長も捕捉時間が許せば、いくつでもよい。By the way, in the above description, the pseudo random code is described as the M code of 3 bits, but the code sequence may be any number and the code length may be any number as long as the acquisition time is allowed.
【００１８】[0018]
【発明の効果】この発明は、以上説明したように構成さ
れているので、同期維持系及び目標検出系の２系統を持
っている従来の測距レーダの構成に切り換え回路等の付
加により、ハードウェアを大型にすることなく同期捕捉
を従来のものより高速にすることができる。Since the present invention is constructed as described above, a hardware such as a switching circuit is added to the construction of a conventional range-finding radar having two systems, a synchronization maintaining system and a target detecting system. The synchronization acquisition can be made faster than the conventional one without increasing the size of the wear.
【図１】この発明の一実施例を示す構成ブロック図であ
る。FIG. 1 is a configuration block diagram showing an embodiment of the present invention.
【図２】図１における主要構成のタイミングチャートで
ある。FIG. 2 is a timing chart of the main configuration in FIG.
【図３】この発明をＭコード３ビットで使用した場合の
同期捕捉パターンの説明図である。FIG. 3 is an explanatory diagram of a synchronization acquisition pattern when the present invention is used with M code of 3 bits.
【図４】従来の測距レーダを示す構成ブロック図であ
る。FIG. 4 is a block diagram showing a configuration of a conventional distance measuring radar.
１ 送信源 ２ 第１の位相変調器 ３ 送信機 ４ 送信アンテナ ５ 受信アンテナ ６ 電力分配器 ７ 第１の復調器 ８ 第１の中間周波増幅器 ９ 第１の振幅検波器 １０ 第２の復調器 １１ 第２の中間周波増幅器 １２ 同期検波器 １３ 変復調用信号発生器 １４ 第２の位相変調器 １５ 第３の位相変調器 １６ 局部発振器 １７ 第１の切り換え回路 １８ 第２の振幅検波器 １９ 振幅比較器 ２０ ディレイ回路 ２１ 第２の切り換え回路 ２２ モード制御器 1 Transmission Source 2 1st Phase Modulator 3 Transmitter 4 Transmission Antenna 5 Reception Antenna 6 Power Divider 7 First Demodulator 8 First Intermediate Frequency Amplifier 9 First Amplitude Detector 10 Second Demodulator 11 Second intermediate frequency amplifier 12 Synchronous detector 13 Modulator / demodulator signal generator 14 Second phase modulator 15 Third phase modulator 16 Local oscillator 17 First switching circuit 18 Second amplitude detector 19 Amplitude comparator 20 delay circuit 21 second switching circuit 22 mode controller
Claims (1)
信号を発生する変復調用信号発生器と、上記変復調用信
号発生器より出力される疑似ランダム符号系列により、
上記送信信号に０，πの２位相変調あるいは平衡変調を
発生する第１の位相変調器と、上記第１の位相変調器出
力を増幅する送信機と、上記送信機出力を空中に送信す
る送信アンテナと、目標よりの反射波を受信する受信ア
ンテナと、上記受信アンテナで受信された受信信号を２
分配する電力分配器と、上記変復調用信号発生器より出
力される疑似ランダム符号系列により復調信号を発生す
る第２の位相変調器と、上記電力分配器の一方の出力
を、上記第２の位相変調器の出力を復調用信号として掛
け算操作を実施し自己相関関数を振幅とする中間周波数
信号を出力する第１の復調器と、上記中間周波数信号を
増幅する第１の中間周波数増幅器と、上記第２の位相変
調器の出力にパルス幅繰り返し周期だけディレイをかけ
るディレイ回路と、上記変復調用信号発生器より出力さ
れる疑似ランダム符号系列と直交している疑似ランダム
符号系列により同期に必要な直交復調信号を発生する第
３の位相変調器と、同期捕捉時には捕捉する距離を２カ
所にするため第２の復調器に上記ディレイ回路の出力
を、同期維持時には上記第３の位相変調器の出力を出力
する第２の切り換え回路と、上記電力分配器の他方の出
力を前記第２の切り換え回路の出力を復調用信号として
掛け算操作を実施し同期捕捉時には自己相関関数を振幅
とする中間周波信号を、同期維持時には自己直交相関関
数を振幅とする中間周波信号を出力する第２の復調器
と、上記中間周波信号を増幅する第２の中間周波増幅器
と、同期捕捉時には上記第２の中間周波増幅器の出力信
号を第２の振幅検波器へ同期維持時には同期検波器へ出
力する第１の切り換え回路と、上記第１の中間周波増幅
器の出力を振幅検波する第１の振幅検波器と、上記第１
の切り換え回路の出力を振幅検波する第２の振幅検波器
と、上記第１、第２の振幅検波器の出力を比較する振幅
検波器と、同期捕捉時には上記振幅検波器の出力により
目標検出の判定及び目標の距離を算出し、上記変復調用
信号発生器へ復調タイミングを出力しモードを同期維持
モードに切り換えるモード制御器と、同期維持時に上記
第１の切り換え回路の出力と上記第１の中間周波増幅器
の出力により掛け算検波あるいはＦＥＴ検波によって得
られる誤差信号を発生する同期検波器と、上記第２、第
３の位相変調器で発生する復調用信号のキャリア信号を
上記第２、第３の位相変調器へ発生する局部発振器とを
備えたことを特徴とする測距レーダ。1. A transmission source for generating a transmission signal, a modulation / demodulation signal generator for generating a modulation / demodulation signal, and a pseudo-random code sequence output from the modulation / demodulation signal generator,
A first phase modulator that generates 0, π two-phase modulation or balanced modulation on the transmission signal, a transmitter that amplifies the first phase modulator output, and a transmission that transmits the transmitter output to the air. An antenna, a receiving antenna for receiving a reflected wave from the target, and a receiving signal received by the receiving antenna.
A power distributor for distributing, a second phase modulator for generating a demodulated signal by a pseudo-random code sequence output from the modulation / demodulation signal generator, and one output of the power distributor for the second phase A first demodulator that outputs an intermediate frequency signal whose amplitude is an autocorrelation function by performing a multiplication operation using the output of the modulator as a demodulation signal; a first intermediate frequency amplifier that amplifies the intermediate frequency signal; A delay circuit for delaying the output of the second phase modulator by a pulse width repetition period and a pseudo-random code sequence orthogonal to the pseudo-random code sequence output from the modulation / demodulation signal generator. The output of the delay circuit is output to the third phase modulator that generates the demodulated signal and to the second demodulator in order to set the capture distances at two points during synchronization capture A second switching circuit that outputs the output of the third phase modulator, and the other output of the power distributor are multiplied by using the output of the second switching circuit as a demodulation signal, and autocorrelation is performed at the time of synchronous acquisition. A second demodulator for outputting an intermediate frequency signal having an amplitude of a function, an intermediate frequency signal having an amplitude of a self-orthogonal correlation function for maintaining synchronization, and a second intermediate frequency amplifier for amplifying the intermediate frequency signal; A first switching circuit for outputting the output signal of the second intermediate frequency amplifier to the second amplitude detector at the time of acquisition, and a first switching circuit for outputting the output signal of the first intermediate frequency amplifier to the synchronous detector at the time of maintaining synchronization; 1 amplitude detector and the first
A second amplitude detector that amplitude-detects the output of the switching circuit, an amplitude detector that compares the outputs of the first and second amplitude detectors, and a target detection by the output of the amplitude detector during synchronous acquisition. A mode controller for calculating the judgment and target distances, outputting demodulation timing to the modulation / demodulation signal generator and switching the mode to the synchronization maintaining mode, and the output of the first switching circuit and the first intermediate when maintaining synchronization. A synchronous detector that generates an error signal obtained by multiplication detection or FET detection by the output of the frequency amplifier, and a carrier signal of a demodulation signal that is generated by the second and third phase modulators are added to the second and third A ranging radar comprising: a local oscillator for generating a phase modulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7006482A JP3009334B2 (en) | 1995-01-19 | 1995-01-19 | Ranging radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7006482A JP3009334B2 (en) | 1995-01-19 | 1995-01-19 | Ranging radar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08194056A true JPH08194056A (en) | 1996-07-30 |
| JP3009334B2 JP3009334B2 (en) | 2000-02-14 |
Family
ID=11639702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7006482A Expired - Fee Related JP3009334B2 (en) | 1995-01-19 | 1995-01-19 | Ranging radar |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3009334B2 (en) |
-
1995
- 1995-01-19 JP JP7006482A patent/JP3009334B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3009334B2 (en) | 2000-02-14 |
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