JP2743996B2

JP2743996B2 - Radar transceiver

Info

Publication number: JP2743996B2
Application number: JP62182732A
Authority: JP
Inventors: 直樹保坂; 博昭川岸
Original assignee: Toshiba Corp
Current assignee: Toshiba Corp
Priority date: 1987-07-22
Filing date: 1987-07-22
Publication date: 1998-04-28
Anticipated expiration: 2013-04-28
Also published as: JPS6426178A

Description

【発明の詳細な説明】［発明の目的］（産業上の利用分野）この発明は、例えばレーダ装置の送信系統や受信系統
に用いられるレーダ送受信装置に関する。（従来の技術）一般に、レーダ装置等の送信系統や受信系統には、変
調回路や増幅回路のように、パルス信号を通過させると
パルス信号内に位相歪や振幅歪を生じる回路を含んでい
る。例えば、パルス・レーダの送受信装置は第４図に示
すように構成される。第４図において、まず同期信号発生器11で発生した中
間周波数信号はパルス変調器121によって中間周波パル
ス信号に変調され、混合器122で高周波パルス信号に周
波数変換される。そして、電力増幅器123で電力増幅さ
れた後、送受信切換器14を通過して送信信号としてアン
テナ15から放射される。以上が送信系統12である。一方、送信信号が目標19に反射してアンテナ15に入射
した受信信号は、送受切換器14を通過し、混合器161で
中間周波信号に周波数変換される。そして、中間周波増
幅器162で電力増幅され、位相検波器163でビデオ信号に
変換された後、信号処理器17で種々の信号処理、例えば
パルス・ドプラ処理等が施され、これによって得られた
情報が指示器18に表示される。以上が受信系統16であ
る。ここで、電力増幅器123及び中間周波増幅器162をはじ
め、各構成回路は多少なりとも通過パルス信号に対して
不要な位相歪あるいは振幅歪を生じさせる。このため、
信号処理過程において、位相歪や振幅歪が不要成分とし
て送受信信号に混在することになる。この場合、１パル
ス内での歪はパルス圧縮等のレンジ相関処理におけるレ
ンジサイドローブを発生してしまい、またパルス間での
歪はMTI（移動目標表示装置）やFFT（高速フーリエ変換
装置）等のスウィープ相関処理に対してスペクトラムの
拡散により性能が低下してしまうことになる。（発明が解決しようとする問題点）以上述べたように従来の送受信装置では、送信系統及
び受信系統で生じた通過信号の位相歪と振幅歪によって
信号処理性能が低下するという問題を有している。この発明は上記問題を解決するためになされたもの
で、通過信号の繰返しパルス内に生じる位相歪と振幅歪
とを抑圧して信号処理機能を向上させるとともに、通過
信号のスペクトラムを改善することができるレーダ送受
信装置を提供することを目的とする。［発明の構成］（問題点を解決するための手段）上記目的を達成するためにこの発明に係るレーダ送受
信装置は、送信繰返しパルスを発生し、送信周波数に変
換した後、電力増幅してレーダ波として送信する送信装
置と、この送信装置で送信されたレーダ波の反射波を受
信して前記送信繰返しパルス間隔内の複素ビデオ信号を
抽出する受信装置とを備えるレーダ送受信装置におい
て、まず、送信装置は、送信系統の各構成回路を通過し
た送信信号の繰返しパルス内に発生する振幅歪及び位相
歪を監視し、振幅歪に対応する振幅補正係数及び位相歪
に対応する位相補正係数を求める監視回路と、この監視
回路により求められた振幅補正係数及び位相補正係数を
記憶する記憶回路と、前記送信繰返しパルスが発生され
る毎に記憶回路から適応する振幅補正係数及び位相補正
係数を読み出して、送信周波数に変換される前の送信繰
り返しパルスそれぞれに読み出した振幅補正係数及び位
相補正係数を乗算することにより、前記送信系統の各構
成回路が送信信号に与える振幅歪及び位相歪を補正する
送信系補正回路とを具備して構成される。さらに、受信装置は、入力信号を所定時間遅延づつ遅
延して複数の信号列に時分割する時分割手段と、この時
分割手段で時分割された信号列にそれぞれ係数列を乗算
する係数乗算手段と、この係数乗算手段の各乗算出力を
加算する加算手段とからなる畳み込み演算部を備えて構
成され、この畳み込み演算部に複素ビデオ信号を入力
し、受信系統の各構成回路を通過するときに発生する振
幅歪及び位相歪の逆特性に対応する係数列を与えて畳み
込み演算を実行することにより、前記受信系統の各構成
回路が前記複素ビデオ信号に与えた振幅歪及び位相歪を
補正するようにしている。（作用）上記構成によるレーダ送受信装置では、レーダ波の送
信時に、送信系統の各構成回路を通過した送信信号の繰
返しパルス内に発生する振幅歪及び位相歪が監視回路で
監視され、この監視結果に基づいて求められた振幅歪に
対応する振幅補正係数及び位相歪に対応する位相補正係
数が記憶回路に記憶される。そして、送信繰返しパルス
が発生される毎に記憶回路から適応する振幅補正係数及
び位相補正係数の読み出しが行なわれ、以後、送信周波
数に変換される前の送信繰り返しパルスそれぞれに読み
出された振幅補正係数及び位相補正係数を乗算されるこ
とにより、送信信号の振幅値が振幅補正係数に対応した
分だけ増減され、位相が位相補正係数に対応した分だけ
偏移されることになる。このため、送信系統の各構成回路を通過することによ
り生じる不要波の放射を抑圧することができ、送信信号
のスペクトラムが改善される。また、例えば線形性を保
つ構成回路を通過した場合にも、歪に対して補正を行な
うことができ、これにより送信信号のスペクトラムを改
善することができる。また、レーダ波の受信時において、受信した反射波の
繰返しパルス間隔内から抽出され、かつ受信系統の各構
成回路を通過する複素ビデオ信号に、受信系統の各構成
回路を通過するときに発生する振幅歪及び位相歪の逆特
性に対応する係数列が与えられて畳み込み演算が実行さ
れることにより、受信系統の各構成回路が複素ビデオ信
号に与えた振幅歪及び位相歪を補正されるので、受信信
号の繰返しパルス間隔内に発生する振幅歪及び位相歪が
抑圧され、これにより受信信号のスペクトラムが改善さ
れる。（実施例）以下、第１図乃至第３図を参照してこの発明の一実施
例を説明する。第１図は第４図に示した送受信装置にこの発明を適用
した場合の構成を示すものである。第１図において第４
図と同一部分には同一符号を付して示し、ここではその
説明を省略する。まず、送信系統12に送信信号に生じる位相歪及び振幅
歪を抑圧する送信系補正回路124を設け、送信信号の品
質を改善する。次に、受信系統16に受信信号に生じる位
相歪及び振幅歪を抑圧する受信系補正回路164を設け、
受信信号の品質を改善する。各補正回路124,164の補正
量はパルス圧縮やMTI等の信号処理を考慮して決定し、
信号処理性能の低下を抑制する。この構成によれば、送信信号の品質が良好であるた
め、不要波（送信スプリアス）の放射を抑圧することが
でき、また品質の良好な受信信号が得られる。第２図は送信系統12に設けられる送信系補正回路124
の具体的な構成を示すものである。この補正回路124は
可変減衰器1241、移送器1242、カウンタ1243、監視回路
1244及びメモリ1245で構成される。この構成において、監視回路1244は電力増幅器123の
出力レベルを制御する利得制御機能と振幅歪及び位相歪
を補正するのに必要な係数を演算する演算機能とを有す
る。利得制御機能は、電力増幅器123の出力レベルを同期
トリガの同期より短い周期でサンプリングして最小レベ
ルをホールドし、この出力レベルが電力増幅器123の出
力として最低限必要なレベルを有していなければ、電力
増幅器123のゲインを必要なレベルがえられるまで上げ
るよう動作する。すなわち、電力増幅器123の出力レベ
ルと最低必要な基準レベルとを比較し、（基準レベル−
出力レベル）だけ出力レベルが上昇するように電力増幅
器123内のAGC（自動利得制御）回路のゲインを制御す
る。演算機能は、電力増幅器123の出力信号を同期トリガ
より短い周期でサンプリングしてA/D（アナログ／デジ
タル）変換し、互いに位相が90゜異なる２つの信号を導
出（直交検波）して複素信号を得る。この複素信号の振幅情報及び位相情報はサンプリング
毎に抽出され、振幅情報を利用して上記した電力増幅器
123のゲインを制御すると共に、振幅の基準パターン及
び位相の基準パターン（基準パターンは各構成回路に振
幅歪、位相歪がないときの電力増幅器123の出力信号の
複素サンプルで得られる振幅値列、位相値列）と比較さ
れる。そして、それぞれ基準値との差の情報がサンプル
値毎に振幅に関する補正係数、位相に関する補正係数と
して導出される。ここで導出された振幅、位相に関する
両補正係数は予めメモリ1245に記憶される。一方、例えばレーダの通常の動作時において、カウン
タ1243はレーダ繰返しパルスに同期した同期トリガによ
りリセットされ、計数動作が開始される。この計数周期
は監視回路1244での信号サンプリング周期に一致してお
り、カウント値がメモリ1245のアドレスとなってメモリ
1245から所定の振幅に関する補正値と位相に関する補正
値が読み出される。これらの各補正値は可変減衰器1241
及び移相器1242にそれぞれ供給される。可変減衰器1241ではメモリ1245からの補正値に従って
パルス変調器121の出力パルスの振幅値をパルス幅より
短いサンプリング周期で補正値に対応した分だけ減衰さ
せる。これにより、可変減衰器1241の出力の振幅パター
ンは基準パターンと一致するようになる。一方、移相器1242ではメモリ1245から読み出された位
相に関する補正値の分だけ可変減衰器1241の出力パルス
をサンプリング毎に位相を偏移させる。これにより位相
器1242の出力の位相パターンは基準パターンと一致する
ようになる。尚、この場合、メモリ1245から信号を読み出して補正
をかける間は監視回路1244からメモリ1245への信号供給
はなく、メモリ1245の記憶補正値を更新するときに信号
が供給される。また、記憶する補正値を設定した場合、
電力増幅器123の出力を監視回路1244に導く構成ではな
く、送信信号の一部を受信系に導く構成にして、第１図
に示す受信系統の位相検波器163の出力の複素信号を監
視回路1244に供給するようにしてもよい。この場合は、
監視回路1244でモニタ信号を直交検波する必要がない。第３図は第１図における受信系補正回路164の具体的
な構成を示すものである。位相検波器163により複素ビ
デオ信号（振幅及び位相情報を持ったビデオ信号）に変
換された受信信号は遅延回路a1〜anによって時分割され
る。各時分割信号は乗算器b1〜bnによって振幅歪及び位
相歪の逆特性となる計数w0〜wn−１が乗算された後、加
算器C6で加算される。すなわち、この受信系補正回路16
4はたたみ込み演算回路によるフィルタで構成され、受
信信号に対して振幅歪及び位相歪の逆特性を有する係数
のたたみ込み演算を行なって、受信信号中の振幅歪及び
位相歪を抑制している。したがって、上記送信系補正回路及び受信系補正回路
が付加された送受信装置は、各系統の通過パルス信号に
重畳される振幅歪及び位相歪に見合った分だけ補償する
ように補正するので、通過信号に生じる位相歪と振幅歪
を抑圧して信号処理機能を向上させ、品質の良好な送信
信号及び受信信号を得ることができる。尚、上記実施例では送受のアンテナを共用するパルス
・レーダについて説明したが、送信アンテナと受信アン
テナを分離した他の送受信システムの送信系統や受信系
統についても、位相歪及び振幅歪の要因を持つものに適
用可能である。また、補正回路は位相歪及び振幅歪の性
格によって系のどの位置に配置してもよく、１か所であ
っても数箇所に分散させてもよい。また、その構成が第
２図及び第３図に示した具体例の構成と異なっていて
も、この発明の要旨を逸脱しない範囲で種々変更しても
よいことは勿論である。さらに、補正回路の補正内容は、歪要素が普遍的なも
のは固定設定でよい。また、歪要素が普遍的でないが、
ある条件による規則性があるものは、その条件判断によ
って設定を切換えるようにしてもよい。さらには、試験
信号等により時々刻々補正内容を更新するようにしても
よいことは勿論である。［発明の効果］以上のようにこの発明によれば、通過信号の繰返しパ
ルス内に生じる位相歪と振幅歪とを抑圧して信号処理機
能を向上させるとともに、通過信号のスペクトラムを改
善することができるレーダ送受信装置を提供することが
できる。この際、送信周波数に変換される前の送信系の
最も低い周波数帯域で振幅歪及び位相歪の補正を行なう
ようにしているので、効率良い補正が図れるとともに、
より効果的なスペクトラムの改善を図ることができる。DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial application field) The present invention relates to a radar transmitting / receiving apparatus used in, for example, a transmission system or a reception system of a radar apparatus. (Prior Art) Generally, a transmission system or a reception system of a radar device or the like includes a circuit such as a modulation circuit or an amplification circuit that causes phase distortion or amplitude distortion in a pulse signal when the pulse signal is passed. . For example, a pulse radar transmitting / receiving apparatus is configured as shown in FIG. In FIG. 4, the intermediate frequency signal generated by the synchronizing signal generator 11 is first modulated by a pulse modulator 121 into an intermediate frequency pulse signal, and the frequency is converted by a mixer 122 into a high frequency pulse signal. Then, after the power is amplified by the power amplifier 123, the signal passes through the transmission / reception switch 14 and is radiated from the antenna 15 as a transmission signal. The above is the transmission system 12. On the other hand, the reception signal, whose transmission signal is reflected by the target 19 and enters the antenna 15, passes through the transmission / reception switch 14, and is frequency-converted by the mixer 161 into an intermediate frequency signal. Then, the power is amplified by the intermediate frequency amplifier 162, converted into a video signal by the phase detector 163, and subjected to various signal processings, for example, pulse Doppler processing, by the signal processor 17, and information obtained by this is obtained. Is displayed on the indicator 18. The above is the reception system 16. Here, each constituent circuit including the power amplifier 123 and the intermediate frequency amplifier 162 causes unnecessary phase distortion or amplitude distortion to the passing pulse signal to some extent. For this reason,
In the signal processing process, phase distortion and amplitude distortion are mixed in the transmission and reception signals as unnecessary components. In this case, distortion within one pulse causes a range side lobe in range correlation processing such as pulse compression, and distortion between pulses can be caused by MTI (moving target display device), FFT (fast Fourier transform device), or the like. The performance of the sweep correlation process is degraded due to the spread of the spectrum. (Problems to be Solved by the Invention) As described above, the conventional transmission / reception device has a problem that signal processing performance is deteriorated due to phase distortion and amplitude distortion of a passing signal generated in a transmission system and a reception system. I have. The present invention has been made to solve the above-described problem, and it is possible to improve the signal processing function by suppressing the phase distortion and the amplitude distortion that occur in the repetitive pulse of the passing signal and improve the spectrum of the passing signal. It is an object of the present invention to provide a radar transmission / reception device that can perform the operation. [Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, a radar transmitting / receiving apparatus according to the present invention generates a repetition pulse of transmission, converts the pulse to a transmission frequency, amplifies the power, and performs radar. In a radar transmitting / receiving apparatus comprising: a transmitting apparatus for transmitting as a wave; and a receiving apparatus for receiving a reflected wave of a radar wave transmitted by the transmitting apparatus and extracting a complex video signal within the transmission repetition pulse interval. The apparatus monitors amplitude distortion and phase distortion occurring in repetitive pulses of a transmission signal that has passed through each component circuit of the transmission system, and monitors an amplitude correction coefficient corresponding to the amplitude distortion and a phase correction coefficient corresponding to the phase distortion. A memory, a storage circuit for storing the amplitude correction coefficient and the phase correction coefficient obtained by the monitoring circuit, and a storage circuit each time the transmission repetition pulse is generated. By reading the amplitude correction coefficient and the phase correction coefficient and multiplying each of the transmission repetition pulses before being converted to the transmission frequency by the read amplitude correction coefficient and the phase correction coefficient, each of the constituent circuits of the transmission system applies a transmission signal to the transmission signal. And a transmission system correction circuit for correcting the applied amplitude distortion and phase distortion. Further, the receiving device may include a time-division unit that delays the input signal by a predetermined time delay and time-divides the signal sequence into a plurality of signal sequences, and a coefficient multiplication unit that multiplies each of the time-divided signal sequences by the coefficient sequence by the coefficient sequence. And a convolution operation unit comprising addition means for adding each multiplication output of this coefficient multiplication means. By performing a convolution operation by providing a coefficient sequence corresponding to the inverse characteristic of the generated amplitude distortion and phase distortion, each component circuit of the reception system corrects the amplitude distortion and phase distortion given to the complex video signal. I have to. (Operation) In the radar transmission / reception device having the above configuration, when a radar wave is transmitted, the monitoring circuit monitors the amplitude distortion and the phase distortion generated in the repetition pulse of the transmission signal that has passed through each circuit of the transmission system. The amplitude correction coefficient corresponding to the amplitude distortion and the phase correction coefficient corresponding to the phase distortion obtained based on the above are stored in the storage circuit. Each time a transmission repetition pulse is generated, an adaptive amplitude correction coefficient and a phase correction coefficient are read out from the storage circuit, and thereafter, the amplitude correction coefficient read out for each transmission repetition pulse before being converted to a transmission frequency. By multiplying by the coefficient and the phase correction coefficient, the amplitude value of the transmission signal is increased or decreased by an amount corresponding to the amplitude correction coefficient, and the phase is shifted by an amount corresponding to the phase correction coefficient. For this reason, it is possible to suppress the emission of unnecessary waves caused by passing through the respective constituent circuits of the transmission system, and the spectrum of the transmission signal is improved. Further, for example, even when the signal passes through a configuration circuit that maintains linearity, the distortion can be corrected, and thereby the spectrum of the transmission signal can be improved. Also, when a radar wave is received, a complex video signal extracted from within the repetitive pulse interval of the received reflected wave and passing through each component circuit of the receiving system is generated when passing through each component circuit of the receiving system. By performing a convolution operation by giving a coefficient sequence corresponding to the inverse characteristic of the amplitude distortion and the phase distortion, the amplitude distortion and the phase distortion given to the complex video signal by each component circuit of the receiving system are corrected. Amplitude distortion and phase distortion occurring within the repetitive pulse interval of the received signal are suppressed, thereby improving the spectrum of the received signal. (Embodiment) An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a configuration in which the present invention is applied to the transmitting / receiving apparatus shown in FIG. In FIG. 1, the fourth
The same parts as those in the figure are denoted by the same reference numerals, and description thereof will be omitted here. First, the transmission system 12 is provided with a transmission system correction circuit 124 for suppressing phase distortion and amplitude distortion generated in a transmission signal, to improve the quality of the transmission signal. Next, a reception system correction circuit 164 that suppresses phase distortion and amplitude distortion generated in the reception signal in the reception system 16 is provided,
Improve the quality of the received signal. The correction amount of each correction circuit 124, 164 is determined in consideration of signal processing such as pulse compression and MTI,
Suppress deterioration in signal processing performance. According to this configuration, since the quality of the transmission signal is good, the emission of unnecessary waves (transmission spurious) can be suppressed, and a reception signal with good quality can be obtained. FIG. 2 shows a transmission system correction circuit 124 provided in the transmission system 12.
3 shows a specific configuration. The correction circuit 124 includes a variable attenuator 1241, a transfer unit 1242, a counter 1243, a monitoring circuit
1244 and a memory 1245. In this configuration, the monitoring circuit 1244 has a gain control function of controlling the output level of the power amplifier 123 and a calculation function of calculating a coefficient necessary for correcting amplitude distortion and phase distortion. The gain control function samples the output level of the power amplifier 123 in a cycle shorter than the synchronization of the synchronization trigger, holds the minimum level, and if this output level does not have the minimum necessary level as the output of the power amplifier 123. , The gain of the power amplifier 123 is increased until a required level is obtained. That is, the output level of the power amplifier 123 is compared with the minimum required reference level, and (reference level−
The gain of an AGC (automatic gain control) circuit in the power amplifier 123 is controlled so that the output level increases by the output level). The arithmetic function samples the output signal of the power amplifier 123 in a cycle shorter than the synchronization trigger, performs A / D (analog / digital) conversion, derives two signals having a phase difference of 90 ° from each other (quadrature detection), and generates a complex signal. Get. The amplitude information and the phase information of the complex signal are extracted for each sampling, and the power amplifier is used by utilizing the amplitude information.
In addition to controlling the gain of 123, an amplitude reference pattern and a phase reference pattern (a reference pattern is an amplitude value sequence obtained from complex samples of an output signal of the power amplifier 123 when each component circuit has no amplitude distortion and no phase distortion, Phase sequence). Then, information on the difference from the reference value is derived as a correction coefficient for the amplitude and a correction coefficient for the phase for each sample value. Both correction coefficients relating to the amplitude and phase derived here are stored in the memory 1245 in advance. On the other hand, for example, during a normal operation of the radar, the counter 1243 is reset by a synchronization trigger synchronized with the radar repetition pulse, and the counting operation is started. This counting cycle coincides with the signal sampling cycle in the monitoring circuit 1244, and the count value becomes the address of the memory 1245, and
From 1245, a correction value for a predetermined amplitude and a correction value for a phase are read. Each of these correction values is stored in the variable attenuator 1241
And a phase shifter 1242. The variable attenuator 1241 attenuates the amplitude value of the output pulse of the pulse modulator 121 by a sampling period shorter than the pulse width by an amount corresponding to the correction value in accordance with the correction value from the memory 1245. As a result, the amplitude pattern of the output of the variable attenuator 1241 matches the reference pattern. On the other hand, the phase shifter 1242 shifts the phase of the output pulse of the variable attenuator 1241 by the amount of the correction value related to the phase read from the memory 1245 every sampling. Thereby, the phase pattern of the output of the phase shifter 1242 matches the reference pattern. In this case, the signal is not supplied from the monitoring circuit 1244 to the memory 1245 while the signal is read from the memory 1245 and the correction is performed, and the signal is supplied when the storage correction value of the memory 1245 is updated. When the correction value to be stored is set,
Instead of a configuration in which the output of the power amplifier 123 is guided to the monitoring circuit 1244, a configuration in which a part of the transmission signal is guided to the reception system, and the complex signal output from the phase detector 163 of the reception system shown in FIG. May be supplied. in this case,
There is no need for the monitor circuit 1244 to perform quadrature detection of the monitor signal. FIG. 3 shows a specific configuration of the receiving system correction circuit 164 in FIG. The received signal converted into a complex video signal (a video signal having amplitude and phase information) by the phase detector 163 is time-divided by the delay circuits a1 to an. Each time-division signal is multiplied by multipliers b1 to bn by counts w0 to wn-1 having inverse characteristics of amplitude distortion and phase distortion, and then added by adder C6. That is, the receiving system correction circuit 16
4 is composed of a filter by a convolution operation circuit, and performs a convolution operation of a coefficient having a reverse characteristic of the amplitude distortion and the phase distortion on the received signal to suppress the amplitude distortion and the phase distortion in the received signal. . Therefore, the transmission / reception apparatus to which the transmission system correction circuit and the reception system correction circuit are added corrects so as to compensate for the amplitude distortion and the phase distortion superimposed on the passing pulse signal of each system. The signal processing function can be improved by suppressing the phase distortion and the amplitude distortion that occur in the transmission and the transmission signal and the reception signal with good quality can be obtained. In the above-described embodiment, the pulse radar sharing the transmitting and receiving antennas has been described. However, the transmitting system and the receiving system of another transmitting / receiving system in which the transmitting antenna and the receiving antenna are separated also have factors of phase distortion and amplitude distortion. Applicable to things. Further, the correction circuit may be arranged at any position in the system depending on the characteristics of the phase distortion and the amplitude distortion, and may be dispersed at one position or at several positions. Even if the configuration is different from the configuration of the specific example shown in FIGS. 2 and 3, it goes without saying that various changes may be made without departing from the gist of the present invention. Further, the correction content of the correction circuit may be fixed if the distortion element is universal. Also, although the distortion element is not universal,
If there is a regularity according to a certain condition, the setting may be switched according to the condition judgment. Further, it goes without saying that the correction content may be updated every moment by a test signal or the like. [Effects of the Invention] As described above, according to the present invention, it is possible to improve the signal processing function by suppressing the phase distortion and the amplitude distortion generated in the repetitive pulse of the passing signal, and to improve the spectrum of the passing signal. It is possible to provide a radar transmission / reception device capable of performing the above. At this time, since the amplitude distortion and the phase distortion are corrected in the lowest frequency band of the transmission system before being converted to the transmission frequency, efficient correction can be achieved,
More effective spectrum improvement can be achieved.

【図面の簡単な説明】第１図はこの発明に係る送受信装置の一実施例を示すブ
ロック回路図、第２図は同実施例の送信系補正回路の構
成を示すブロック回路図、第３図は同実施例の受信系補
正回路の構成を示すブロック回路図、第４図は従来のパ
ルス・レーダの送受信装置の構成を示すブロック回路図
である。 11……同期信号発生器、12……送信系統、121……パル
ス変調器、122……混合器、123……電力増幅器、124…
…送信系補正回路、1241……可変減衰器、1242……移相
器、1243……カウンタ、1244……監視回路、1245……メ
モリ、13……局部信号発生器、14……送受切換器、15…
…アンテナ、16……受信系統、161……混合器、162……
中間周波増幅器、163……位相検波器、164……受信系補
正回路、a1〜an……遅延回路、b1〜bn……乗算器、ｃ…
…加算器、17……信号処理器、18……指示器、19……目
標。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block circuit diagram showing an embodiment of a transmission / reception apparatus according to the present invention, FIG. 2 is a block circuit diagram showing a configuration of a transmission system correction circuit of the embodiment, FIG. FIG. 4 is a block circuit diagram showing a configuration of a receiving system correction circuit of the embodiment, and FIG. 4 is a block circuit diagram showing a configuration of a conventional pulse radar transmitting / receiving apparatus. 11: Synchronous signal generator, 12: Transmission system, 121: Pulse modulator, 122: Mixer, 123: Power amplifier, 124:
... Transmission system correction circuit, 1241 ... Variable attenuator, 1242 ... Phase shifter, 1243 ... Counter, 1244 ... Monitoring circuit, 1245 ... Memory, 13 ... Local signal generator, 14 ... Transceiver switch , 15 ...
... Antenna, 16 ... Reception system, 161 ... Mixer, 162 ...
Intermediate frequency amplifier, 163 ... Phase detector, 164 ... Receiving system correction circuit, a1-an ... Delay circuit, b1-bn ... Multiplier, c ...
... adder, 17 ... signal processor, 18 ... indicator, 19 ... target.

───────────────────────────────────────────────────── フロントページの続き (56)参考文献特開昭60−78370（ＪＰ，Ａ) 特開昭61−26341（ＪＰ，Ａ) 特開昭57−10519（ＪＰ，Ａ) 特開昭59−17736（ＪＰ，Ａ) 実開昭59−45582（ＪＰ，Ｕ) ────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-60-78370 (JP, A) JP-A-61-26341 (JP, A) JP-A-57-10519 (JP, A) JP-A-59-17736 (JP, A) Shokai Sho 59-45582 (JP, U)

Claims

(57) [Claims] A transmission device that generates a transmission repetition pulse, converts the transmission frequency to a transmission frequency, amplifies the power, and transmits the amplified power as a radar wave,
A receiver for receiving a reflected wave of a radar wave transmitted by the transmitting apparatus and extracting a complex video signal within the transmission repetition pulse interval, wherein the transmitting apparatus comprises: A monitoring circuit that monitors amplitude distortion and phase distortion occurring in the repetitive pulse of the transmission signal that has passed through, and obtains an amplitude correction coefficient corresponding to the amplitude distortion and a phase correction coefficient corresponding to the phase distortion; A storage circuit for storing the amplitude correction coefficient and the phase correction coefficient, and reading out the adaptive amplitude correction coefficient and phase correction coefficient from the storage circuit each time the transmission repetition pulse is generated, before the conversion to the transmission frequency. By multiplying each of the transmission repetition pulses by the read amplitude correction coefficient and phase correction coefficient, each component circuit of the transmission system gives the transmission signal. A transmitting / receiving correction circuit for correcting amplitude distortion and phase distortion. 2. The receiving device is a time-division unit that time-divides the input signal into a plurality of signal sequences by delaying the input signal by a predetermined time delay, and a coefficient multiplication unit that multiplies the signal sequence time-divided by the time-division unit with a coefficient sequence. A convolution operation unit comprising an addition unit for adding each multiplication output of the coefficient multiplication unit, and an amplitude generated when the complex video signal is input to the convolution operation unit and passes through each component circuit of the reception system. By performing a convolution operation by giving a coefficient sequence corresponding to the inverse characteristic of distortion and phase distortion, each component circuit of the receiving system corrects the amplitude distortion and phase distortion given to the complex video signal. The radar transmitting and receiving apparatus according to claim 1, wherein