JP2005241418A

JP2005241418A - Radar device

Info

Publication number: JP2005241418A
Application number: JP2004051242A
Authority: JP
Inventors: Hiroichi Sotozono; 博一外園; Tomonori Osumi; 知範大住; Toshihiko Iijima; 敏彦飯島; Seiichi Sakai; 清一阪井; Tsutomu Watabe; 勉渡部; Yosuke Nonaka; 陽介野中; Yuusuke Shijiki; 雄介志自岐
Original assignee: Japan Steel Works Ltd; Technical Research and Development Institute of Japan Defence Agency
Current assignee: Japan Steel Works Ltd; Technical Research and Development Institute of Japan Defence Agency
Priority date: 2004-02-26
Filing date: 2004-02-26
Publication date: 2005-09-08
Anticipated expiration: 2024-02-26
Also published as: JP3799421B2

Abstract

<P>PROBLEM TO BE SOLVED: To detect an object in a main lobe direction without misdetecting an object in a side lobe direction under an interference environment. <P>SOLUTION: A Σ beam received signal of a main antenna 11 and a first auxiliary beam received signal of a first auxiliary antenna 121 are input to an SLC processor 131 to suppress interference signal components in the Σ beam received signal. The first auxiliary beam received signal of the first auxiliary antenna 121 and a second auxiliary beam received signal of a second auxiliary antenna 122 are input to a SLC processor 132 to suppress interference signal components in the first auxiliary beam received signal. The Σ beam received signal and the first auxiliary beam received signal after interference suppression are input to an SLB processor 14 to remove a side lobe received part of the Σ beam and to extract a main lobe received part thereof. A coefficient K of the SLB processing is switched in accordance with the on/off control of the SLC processing to perform coefficient setting in consideration of residual electric power after interference suppression. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、妨害抑圧機能を有するレーダ装置に関する。 The present invention relates to a radar apparatus having a jamming suppression function.

目標検出レーダ装置に用いられる妨害抑圧機能として、ＳＬＣ（sidelobe canceller）処理及びＳＬＢ（sidelobe blanking）処理が知られている。これらの処理を行う場合には、挟覆域のアンテナパターン特性を有する主ビーム（ここではΣビームとする）を形成する主アンテナと、主ビームのサイドローブ覆域が包含されるように広覆域のアンテナパターン特性を有する補助ビームを形成する補助アンテナが用いられる。 As interference suppression functions used in the target detection radar device, SLC (sidelobe canceller) processing and SLB (sidelobe blanking) processing are known. When these processes are performed, the main antenna that forms the main beam (here, Σ beam) having the antenna pattern characteristics in the sandwiched area and the side lobe coverage of the main beam are widely covered. An auxiliary antenna that forms an auxiliary beam having a wide antenna pattern characteristic is used.

ＳＬＣ処理では、主アンテナで受けたΣビーム受信信号から補助アンテナで受けた補助ビーム受信信号の振幅及び位相を補正して減算することにより、Σビーム受信信号から妨害信号によって生じた不要信号成分を抑圧する。ＳＬＢ処理では、補助アンテナで受けた補助ビーム受信信号に予め設定された複素ウェイトをかけて主ビーム受信信号の振幅レベルと比較し、この比較結果からΣビームのメインローブ受信部分とサイドローブ受信部分とを判別し、この判別結果からサイドローブ受信部分を除去し、メインローブ受信部分のみを出力する。 In SLC processing, by correcting and subtracting the amplitude and phase of the auxiliary beam reception signal received by the auxiliary antenna from the Σ beam reception signal received by the main antenna, unnecessary signal components generated by the interference signal from the Σ beam reception signal are subtracted. Repress. In the SLB processing, the auxiliary beam reception signal received by the auxiliary antenna is multiplied by a complex weight set in advance and compared with the amplitude level of the main beam reception signal. From this comparison result, the main lobe reception part and side lobe reception part of the Σ beam And the side lobe reception portion is removed from the determination result, and only the main lobe reception portion is output.

近時、上記のＳＬＣ処理とＳＬＢ処理を併用した目標検出レーダ装置が提案されている。この提案方式では、ＳＬＣ処理結果にＳＬＢ処理を施して、妨害信号による不要信号成分の抑圧と、サイドローブの妨害受信部分の除去を同時に実現しようとするものである。 Recently, a target detection radar apparatus using both the above SLC processing and SLB processing has been proposed. In this proposed method, SLB processing is performed on the SLC processing result to simultaneously realize suppression of unnecessary signal components due to interference signals and removal of interference reception portions of side lobes.

但し、妨害環境下では、主アンテナのサイドローブから入力される妨害信号に対して補助アンテナで受信される妨害信号の方が大きくなるため、ＳＬＢ処理を行うと目標を検出できなくなる。これを回避するため、上記の提案方式では、外部からＳＬＣオン・オフ制御信号を与えて、ＳＬＣ処理とＳＬＢ処理のどちらか一方のみの処理を選択するように構成している。 However, in the interference environment, the interference signal received by the auxiliary antenna is larger than the interference signal input from the side lobe of the main antenna, and therefore the target cannot be detected when the SLB process is performed. In order to avoid this, the proposed method is configured so that an SLC on / off control signal is given from the outside and only one of the SLC process and the SLB process is selected.

以上のように、従来のレーダ装置における妨害除去機能としてＳＬＣ処理とＳＬＢ処理が知られているが、妨害環境下において、サイドローブ方向の目標を誤検出せず、かつメインローブ方向の目標を検出するよう、ＳＬＣ処理とＳＬＢ処理を同時に実施することができないという問題があった。 As described above, SLC processing and SLB processing are known as the interference removal function in the conventional radar apparatus, but the target in the side lobe direction is not erroneously detected and the target in the main lobe direction is detected in the interference environment. Thus, there is a problem that the SLC process and the SLB process cannot be performed at the same time.

本発明は上記の問題を解決し、妨害環境下において、サイドローブ方向の目標を誤検出せず、かつメインローブ方向の目標を検出するよう、ＳＬＣ処理とＳＬＢ処理を同時に実施することのできるレーダ装置を提供することを目的とする。 The present invention solves the above-described problem, and can perform SLC processing and SLB processing at the same time so as to detect the target in the main lobe direction without erroneously detecting the target in the side lobe direction in the interference environment. An object is to provide an apparatus.

本発明のその他の目的や新規な特徴は後述の実施の形態において明らかにする。 Other objects and novel features of the present invention will be clarified in embodiments described later.

上記の目的を達成するために本願第１発明に係るレーダ装置は、主ビームを形成する主アンテナと、
それぞれ前記主ビームのサイドローブ領域まで包含するように広い覆域をカバーする補助ビームを形成する第１及び第２の補助アンテナと、
前記主アンテナで得られる主ビーム受信信号から前記第１の補助アンテナで得られる第１の補助ビーム受信信号の振幅及び位相を補正して減算することにより前記主ビーム受信信号の不要信号成分を抑圧する第１のＳＬＣ処理手段と、
前記第１の補助アンテナで得られる第１の補助ビーム受信信号から前記第２の補助アンテナで得られる第２の補助ビーム受信信号の振幅及び位相を補正して減算することにより第１の補助ビーム受信信号の不要信号成分を抑圧する第２のＳＬＣ処理手段と、
前記第１のＳＬＣ処理手段から出力される受信信号の振幅と前記第２のＳＬＣ処理手段から出力される受信信号に所定の係数値を乗算した振幅とを比較し、この振幅比較結果から前記主アンテナのメインローブで受信された信号とサイドローブで受信された信号とを判別し、前記サイドローブの受信信号を除去し、前記メインローブの受信信号のみを出力するＳＬＢ処理手段とを具備する構成としている。 In order to achieve the above object, a radar apparatus according to the first invention of the present application includes a main antenna that forms a main beam,
First and second auxiliary antennas each forming an auxiliary beam covering a wide coverage area to encompass the side lobe region of the main beam;
The unnecessary signal component of the main beam received signal is suppressed by correcting and subtracting the amplitude and phase of the first auxiliary beam received signal obtained by the first auxiliary antenna from the main beam received signal obtained by the main antenna. First SLC processing means to:
The first auxiliary beam is obtained by correcting and subtracting the amplitude and phase of the second auxiliary beam received signal obtained by the second auxiliary antenna from the first auxiliary beam received signal obtained by the first auxiliary antenna. Second SLC processing means for suppressing unnecessary signal components of the received signal;
The amplitude of the reception signal output from the first SLC processing means is compared with the amplitude obtained by multiplying the reception signal output from the second SLC processing means by a predetermined coefficient value. SLB processing means for discriminating between a signal received by the main lobe of the antenna and a signal received by the side lobe, removing the reception signal of the side lobe, and outputting only the reception signal of the main lobe It is said.

上記構成によるレーダ装置では、主アンテナの主ビーム受信信号と第１の補助アンテナの第１の補助ビーム受信信号とを第１のＳＬＣ処理手段に入力して主ビーム受信信号から妨害信号成分を抑圧し、第１の補助アンテナの第１の補助ビーム受信信号と第２の補助アンテナの第２の補助ビーム受信信号とを第２のＳＬＣ処理手段に入力して第１の補助ビーム受信信号から妨害信号成分を抑圧し、妨害抑圧後の主ビーム受信信号と第１の補助ビーム受信信号をＳＬＢ処理手段に入力して主ビームのサイドローブ受信部分を除去しメインローブ受信部分を取り出す。ここで、ＳＬＣ処理のオン・オフ制御に応じてＳＬＢ処理の係数Ｋの値を切り換え、妨害抑圧後の残留電力を考慮した係数設定を行うことができる。 In the radar apparatus having the above configuration, the main beam received signal of the main antenna and the first auxiliary beam received signal of the first auxiliary antenna are input to the first SLC processing means to suppress the interference signal component from the main beam received signal. Then, the first auxiliary beam received signal of the first auxiliary antenna and the second auxiliary beam received signal of the second auxiliary antenna are input to the second SLC processing means to interfere with the first auxiliary beam received signal. The main beam received signal and the first auxiliary beam received signal after suppressing the signal component are input to the SLB processing means to remove the side lobe receiving portion of the main beam and take out the main lobe receiving portion. Here, the value of the coefficient K of the SLB process can be switched according to the on / off control of the SLC process, and the coefficient can be set in consideration of the residual power after interference suppression.

このように、ＳＬＣ処理により主ビーム受信信号、第１の補助ビーム受信信号から妨害信号成分を適切に抑圧した上でＳＬＢ処理を行うようにしているので、妨害環境下においても、サイドローブ方向の目標を誤検出せず、かつメインローブ方向の目標を検出することが可能となる。 As described above, the SLB processing is performed after the interference signal component is appropriately suppressed from the main beam reception signal and the first auxiliary beam reception signal by the SLC processing. The target in the main lobe direction can be detected without erroneously detecting the target.

本願第２発明に係るレーダ装置は、主ビームを形成する主アンテナと、
それぞれ前記主ビームのサイドローブ領域まで包含するように広い領域をカバーする補助ビームを形成する第１乃至第Ｎ＋１（Ｎは２以上の自然数）の補助アンテナと、
前記主アンテナで得られる主ビーム受信信号から前記第１の補助アンテナで得られる第１の補助ビーム受信信号の振幅及び位相を補正して減算することにより前記主ビーム受信信号の不要信号成分を抑圧する第１のＳＬＣ（sidelobe canceller）処理手段と、
前記第ｉ（ｉは１〜Ｎのいずれかの自然数）の補助アンテナで得られる第ｉの補助ビーム受信信号から前記第ｉ＋１の補助アンテナで得られる第ｉ＋１の補助ビーム受信信号の振幅及び位相を補正して減算することにより第ｉの補助ビーム受信信号の不要信号成分を抑圧する第２乃至第Ｎ＋１のＳＬＣ処理手段と、
前記第ｋ（ｋは１〜Ｎのいずれかの自然数）のＳＬＣ処理手段で得られる受信信号から前記ｋ＋１のＳＬＣ処理手段で得られる受信信号の振幅及び位相を補正して減算することにより第ｋのＳＬＣ処理手段で得られる受信信号の不要信号成分を抑圧するＳＬＣ処理を前記補助アンテナの個数に応じて段階的に行い、最終的に前記主ビーム受信信号の不要信号成分抑圧結果と前記第１の補助ビーム不要信号成分抑圧結果を出力するＳＬＣ出力処理手段と、
前記主ビーム受信信号の不要信号成分抑圧結果の振幅と前記第１の補助ビーム受信信号の不要信号抑圧結果に所定の係数値を乗算した振幅とを比較し、この振幅比較結果から前記主アンテナのメインローブで受信された信号とサイドローブで受信された信号とを判別し、前記サイドローブの受信信号を除去し、前記メインローブの受信信号のみを出力するＳＬＢ（sidelobe blanking）処理手段とを具備する構成としている。 A radar apparatus according to a second invention of the present application includes a main antenna that forms a main beam;
1st to N + 1th (N is a natural number of 2 or more) auxiliary antennas that form auxiliary beams covering a wide area so as to cover each side lobe area of the main beam;
The unnecessary signal component of the main beam received signal is suppressed by correcting and subtracting the amplitude and phase of the first auxiliary beam received signal obtained by the first auxiliary antenna from the main beam received signal obtained by the main antenna. First SLC (sidelobe canceller) processing means to
The amplitude and phase of the (i + 1) th auxiliary beam reception signal obtained by the (i + 1) th auxiliary antenna from the ith auxiliary beam reception signal obtained by the ith (i is a natural number from 1 to N) auxiliary antenna. Second to (N + 1) th SLC processing means for suppressing unnecessary signal components of the i-th auxiliary beam received signal by correcting and subtracting;
By correcting and subtracting the amplitude and phase of the received signal obtained by the k + 1 SLC processing unit from the received signal obtained by the kth (k is a natural number from 1 to N) SLC processing unit. SLC processing for suppressing unnecessary signal components of the received signal obtained by the SLC processing means is performed stepwise according to the number of auxiliary antennas, and finally the unnecessary signal component suppression result of the main beam received signal and the first SLC output processing means for outputting the auxiliary beam unnecessary signal component suppression result of
The amplitude of the unwanted signal component suppression result of the main beam received signal is compared with the amplitude obtained by multiplying the unwanted signal suppression result of the first auxiliary beam received signal by a predetermined coefficient value. SLB (sidelobe blanking) processing means for discriminating between a signal received by the main lobe and a signal received by the side lobe, removing the reception signal of the side lobe, and outputting only the reception signal of the main lobe It is configured to do.

また、前記第１乃至第Ｎ＋１のＳＬＣ処理手段及び前記ＳＬＣ出力処理手段の全処理をオン・オフ制御する制御手段と、この制御手段のオン・オフに合わせて前記ＳＬＢ処理手段の係数値を切り換える係数値切換手段とを設ける構成としてもよい。 Also, a control means for controlling on / off of all processes of the first to N + 1th SLC processing means and the SLC output processing means, and a coefficient value of the SLB processing means are switched in accordance with the on / off of the control means. Coefficient value switching means may be provided.

本発明に係るレーダ装置によれば、ＳＬＣ処理手段とＳＬＢ処理手段とを備える構成において、ＳＬＣ処理により主ビーム受信信号、第１の補助ビーム受信信号から妨害信号成分を適切に抑圧した上でＳＬＢ処理を行うようにしているので、妨害環境下においても、サイドローブ方向の目標を誤検出せず、かつメインローブ方向の目標を検出することが可能となる。 According to the radar apparatus of the present invention, in the configuration including the SLC processing unit and the SLB processing unit, the SLB process appropriately suppresses the interference signal component from the main beam reception signal and the first auxiliary beam reception signal, and then performs the SLB. Since the processing is performed, it is possible to detect the target in the main lobe direction without erroneously detecting the target in the side lobe direction even in an interference environment.

以下、本発明を実施するための最良の形態として、レーダ装置の実施の形態を図面に従って説明する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a radar device will be described below with reference to the drawings as the best mode for carrying out the present invention.

（第１の実施の形態）
図１は本発明に係る目標検出レーダ装置の第１の実施の形態の構成を示すブロック図である。図１において、主アンテナ１１は挟覆域のアンテナパターン特性を有する主ビーム（ここではΣビームとする）を形成する。第１及び第２の補助アンテナ１２１，１２２はそれぞれΣビームのサイドローブ領域まで包含されるように広覆域のアンテナパターン特性を有する第１、第２の補助ビームを形成する。 (First embodiment)
FIG. 1 is a block diagram showing a configuration of a first embodiment of a target detection radar apparatus according to the present invention. In FIG. 1, a main antenna 11 forms a main beam (here, referred to as a Σ beam) having antenna pattern characteristics in a sandwiched area. The first and second auxiliary antennas 121 and 122 form first and second auxiliary beams having wide-band antenna pattern characteristics so as to be covered up to the side lobe region of the Σ beam, respectively.

主アンテナ１で受けたΣビーム受信信号及び第１の補助アンテナで受けた第１の補助ビーム受信信号は第１のＳＬＣ処理部（処理手段）１３１に供給される。 The Σ beam received signal received by the main antenna 1 and the first auxiliary beam received signal received by the first auxiliary antenna are supplied to the first SLC processing unit (processing means) 131.

この第１のＳＬＣ処理部１３１において、Σビーム受信信号は減算器Ａ１により後述の処理によって求められる妨害信号成分が減算される。この減算処理結果は、残留妨害成分として乗算器Ａ２に供給され、第１の補助ビーム受信信号と複素乗算された後、ローパスフィルタＡ３で低域成分が抽出される。この抽出結果は残留妨害成分と第１の補助アンテナ１２１で受信された妨害信号との相関処理結果であり、複素ウェイトＷ１として切換器Ａ４を介して乗算器Ａ５に供給され、第１の補助ビーム受信信号と複素乗算される。この複素乗算により振幅及び位相がΣビーム受信信号の振幅及び位相と一致するように補正される。補正後の補助ビーム受信信号は、妨害信号成分として減算器Ａ１の減算処理に供される。以上の処理により、Σビーム受信信号の妨害信号成分が抑圧される。 In the first SLC processing unit 131, the interference signal component obtained by the processing described later is subtracted from the Σ beam reception signal by the subtractor A1. The result of this subtraction processing is supplied as a residual interference component to the multiplier A2, and after being subjected to complex multiplication with the first auxiliary beam reception signal, a low-frequency component is extracted by the low-pass filter A3. This extraction result is a correlation processing result between the residual interference component and the interference signal received by the first auxiliary antenna 121, and is supplied as a complex weight W1 to the multiplier A5 via the switch A4. The received signal is complex-multiplied. By this complex multiplication, the amplitude and phase are corrected so as to coincide with the amplitude and phase of the Σ beam reception signal. The corrected auxiliary beam reception signal is subjected to the subtraction processing of the subtractor A1 as an interference signal component. Through the above processing, the interference signal component of the Σ beam reception signal is suppressed.

ここで、上記切換器Ａ４は、外部からのＳＬＣオン・オフ制御信号（制御手段）がＳＬＣオンを指示している場合には複素ウェイトＷ１を導出し、ＳＬＣオフを指示している場合には複素ウェイトＷ０＝０を導出する切換処理を行う。Ｗ０＝０とすることにより、減算器Ａ１の減算処理がなくなり、妨害信号の抑圧処理をオフ状態とすることができる。 Here, the switch A4 derives the complex weight W1 when the SLC on / off control signal (control means) from the outside instructs SLC on, and when the SLC on / off control signal (control means) instructs SLC off. A switching process for deriving the complex weight W0 = 0 is performed. By setting W0 = 0, the subtraction process of the subtracter A1 is eliminated, and the interference signal suppression process can be turned off.

一方、第１及び第２の補助アンテナ１２１，１２２で受けた第１及び第２の補助ビーム受信信号は第２のＳＬＣ処理部１３２に供給される。この第２のＳＬＣ処理部１３２は、第１のＳＬＣ処理部１３１と同構成であり（同一部分に同一符号を付して示す）、第２の補助ビーム受信信号の振幅及び位相を第１の補助ビーム受信信号と一致するように補正して第１の補助ビーム受信信号から減算することにより、第１の補助ビーム受信信号の妨害信号成分を抑圧し、ＳＬＣオン・オフ制御信号に応じて複素ウェイトＷ０，Ｗ１を切り換えることでＳＬＣ処理のオン・オフ状態を選択可能となされている。 On the other hand, the first and second auxiliary beam reception signals received by the first and second auxiliary antennas 121 and 122 are supplied to the second SLC processing unit 132. The second SLC processing unit 132 has the same configuration as that of the first SLC processing unit 131 (the same parts are denoted by the same reference numerals), and the amplitude and phase of the second auxiliary beam reception signal are set to the first SLC processing unit 131. The interference signal component of the first auxiliary beam reception signal is suppressed by performing correction so as to match the auxiliary beam reception signal and subtracting from the first auxiliary beam reception signal, and complex according to the SLC on / off control signal. By switching the weights W0 and W1, the on / off state of the SLC process can be selected.

上記第１及び第２のＳＬＣ処理部１３１，１３２の処理結果は共にＳＬＢ処理部（処理手段）１４に供給される。このＳＬＢ処理部１４は、乗算器Ｂ１及び振幅比較器Ｂ２を備える。 The processing results of the first and second SLC processing units 131 and 132 are supplied to the SLB processing unit (processing unit) 14. The SLB processing unit 14 includes a multiplier B1 and an amplitude comparator B2.

乗算器Ｂ１は、第２のＳＬＣ処理部１３２の処理結果に係数発生部１５から選択的に供給される係数Ｋと複素乗算することで複素ウェイトをかける。 The multiplier B1 multiplies the processing result of the second SLC processing unit 132 by a complex weight by multiplying the coefficient K selectively supplied from the coefficient generating unit 15 by a complex weight.

振幅比較器Ｂ２は、乗算器Ｂ１の出力と第１のＳＬＣ処理部１３１の処理結果との振幅比較を行い、その比較結果からΣビーム受信信号のメインローブ受信部分とサイドローブ受信部分を判別する。この判別は、（Σビーム受信信号強度／補助ビーム受信信号強度）≧Ｋの場合はメインローブ受信とし、（Σビーム受信信号強度／補助ビーム受信信号強度）＜Ｋの場合はサイドローブ受信とする。この判別結果から、サイドローブ受信部分を除去してメインローブ受信部分のみを出力する。 The amplitude comparator B2 performs amplitude comparison between the output of the multiplier B1 and the processing result of the first SLC processing unit 131, and determines the main lobe reception portion and the side lobe reception portion of the Σ beam reception signal from the comparison result. . This determination is made as main lobe reception when (Σ beam received signal intensity / auxiliary beam received signal intensity) ≧ K, and side lobe reception when (Σ beam received signal intensity / auxiliary beam received signal intensity) <K. . From this determination result, the side lobe reception part is removed and only the main lobe reception part is output.

ここで、上記係数発生部１５は、ＳＬＣオン・オフ制御信号に応じてＳＬＢ処理部１４の乗算器Ｂ１に供給する係数Ｋの値を切り換える機能を有する。 Here, the coefficient generation unit 15 has a function of switching the value of the coefficient K supplied to the multiplier B1 of the SLB processing unit 14 in accordance with the SLC on / off control signal.

上記構成において、図２乃至図４を参照してその処理動作を説明する。 In the above configuration, the processing operation will be described with reference to FIGS.

図２はＳＬＣ処理の動作を説明するためのアンテナビームパターンを示す図、図３はＳＬＢ処理の動作を説明するためのアンテナビームパターンを示す図、図４は主アンテナ及び補助アンテナの妨害抑圧後の受信信号強度変化を示す特性図である。 2 is a diagram showing an antenna beam pattern for explaining the operation of the SLC processing, FIG. 3 is a diagram showing an antenna beam pattern for explaining the operation of the SLB processing, and FIG. 4 is a diagram after interference suppression of the main antenna and the auxiliary antenna. It is a characteristic view which shows the received signal strength change of.

図２において、主アンテナ１１で形成されるΣビームａは所望の方向にメインローブを有する。これに対し、補助アンテナ１２１で形成される第１の補助ビームｂ１はΣビームａのサイドローブを包含する広覆域のアンテナパターンを有する。 In FIG. 2, the Σ beam a formed by the main antenna 11 has a main lobe in a desired direction. On the other hand, the first auxiliary beam b1 formed by the auxiliary antenna 121 has a wide coverage antenna pattern including the side lobe of the Σ beam a.

図中矢印で示すように、Σビームａのサイドローブ領域から妨害信号が到来したとする。ＳＬＣオン状態において、ＳＬＣ処理部１３１では、Σビームａの受信信号の減算処理出力と第１の補助ビームｂ１の受信信号との相関をとり、妨害信号受信点を検出する。その相関検出結果から、妨害信号受信点でΣビームａの受信レベルに一致し、同位相となるように第１の補助ビーム受信信号をシフトするための複素ウェイトＷ１を求める。そして、第１の補助ビーム受信信号に複素ウェイトＷ１を乗算してΣビームａの受信信号から減算する。このような処理をループ制御によって繰り返し行うことにより、Σビームａの妨害残留成分のアンテナパターンには、妨害信号到来方向に対してヌルが形成されることになる。この結果、Σビームａの受信信号に生じる妨害信号成分を抑圧することができる。 As indicated by the arrows in the figure, it is assumed that an interference signal has arrived from the side lobe region of the Σ beam a. In the SLC on state, the SLC processing unit 131 detects the interference signal reception point by correlating the subtraction processing output of the reception signal of the Σ beam a with the reception signal of the first auxiliary beam b1. From the correlation detection result, a complex weight W1 for shifting the first auxiliary beam reception signal so as to coincide with the reception level of the Σ beam a at the interference signal reception point and to have the same phase is obtained. Then, the first auxiliary beam reception signal is multiplied by the complex weight W1 and subtracted from the reception signal of the Σ beam a. By repeatedly performing such processing by loop control, a null is formed in the interference pattern arrival direction of the Σ beam a in the interference signal arrival direction. As a result, the interference signal component generated in the received signal of the Σ beam a can be suppressed.

同様に、ＳＬＣ処理部１３２では、第１の補助ビームｂ１の受信信号の減算処理出力と第２の補助ビームｂ２の受信信号との相関をとり、妨害信号受信点を検出する。その相関検出結果から、妨害信号受信点で第１の補助ビームｂ１の受信レベルに一致し、同位相となるように第２の補助ビーム受信信号をシフトするための複素ウェイトＷ１を求める。そして、第２の補助ビーム受信信号に複素ウェイトＷ１を乗算して第１の補助ビーム受信信号から減算する。このような処理をループ制御によって繰り返し行うことにより、第１の補助ビームｂ１の妨害残留成分のアンテナパターンには、妨害信号到来方向に対してヌルが形成されることになる。この結果、第１の補助ビーム受信信号に生じる妨害信号成分を抑圧することができる。 Similarly, the SLC processing unit 132 detects the interference signal reception point by correlating the subtraction processing output of the reception signal of the first auxiliary beam b1 and the reception signal of the second auxiliary beam b2. From the correlation detection result, a complex weight W1 for shifting the second auxiliary beam reception signal so as to coincide with the reception level of the first auxiliary beam b1 at the interference signal reception point and to have the same phase is obtained. Then, the second auxiliary beam reception signal is multiplied by the complex weight W1 and subtracted from the first auxiliary beam reception signal. By repeating such processing by loop control, a null is formed in the antenna pattern of the residual interference component of the first auxiliary beam b1 with respect to the interference signal arrival direction. As a result, the interference signal component generated in the first auxiliary beam reception signal can be suppressed.

一方、図３に示すように、信号１がΣビームａのメインローブ方向から入射された場合に、Σビームａで受信する信号強度が補助ビームｂ１で受信する受信強度より大きくなる。このため、ＳＬＢ処理部１４において、Σビームａの受信信号の振幅と第１の補助ビームｂ１の受信信号に初期設定された係数Ｋ１を乗じた振幅とを比較することで、信号１を検出することができる。ところが、Σビームａのサイドローブ方向から到来する信号２の場合は、Σビームａで受信する信号強度より補助ビームｂ１で受信する信号強度の方が大きくなり、このままでは信号２を検出することができない。そこで、Σビームａの最大サイドローブのアンテナゲインをＧsll、補助ビームｂ１のアンテナゲインをＧauxとしたとき、
Ｇsll ＜Ｋ０・Ｇaux
が成立するように係数Ｋ０を設定する。これにより、ＳＬＢ処理部１４において、Σビームａのサイドローブ方向から受信される信号強度が目標を検出できる十分な信号強度を有していても、これが検出されないように処理することができる。 On the other hand, as shown in FIG. 3, when the signal 1 is incident from the main lobe direction of the Σ beam a, the signal intensity received by the Σ beam a becomes larger than the reception intensity received by the auxiliary beam b1. Therefore, the SLB processing unit 14 detects the signal 1 by comparing the amplitude of the received signal of the Σ beam a with the amplitude obtained by multiplying the received signal of the first auxiliary beam b1 by the coefficient K1 that is initially set. be able to. However, in the case of the signal 2 coming from the side lobe direction of the Σ beam a, the signal intensity received by the auxiliary beam b1 is larger than the signal intensity received by the Σ beam a, and the signal 2 can be detected as it is. Can not. Therefore, when the antenna gain of the maximum side lobe of the Σ beam a is Gsll and the antenna gain of the auxiliary beam b1 is Gaux,
Gsll <K0 ・ Gaux
The coefficient K0 is set so that. Thereby, even if the signal strength received from the side lobe direction of the Σ beam a has sufficient signal strength to detect the target, the SLB processing unit 14 can perform processing so that it is not detected.

ここで、信号１（Ｓ１）と信号２（Ｓ２）が同時に到来した場合で、かつ、信号２が妨害信号で、
｜Ｓ２｜（信号２の受信強度）＞＞｜Ｓ１｜（信号１の受信強度）
が成り立つ場合、Σビームａで受信した信号はＳＬＣ処理により妨害信号である信号２の成分が抑圧されている。したがって、ＳＬＢ処理部１４に入力されるΣビームａの受信信号は（信号１）＋（信号２の妨害抑圧後の残留成分）のみとなる。図４に主アンテナ１１の妨害抑圧後の受信強度分布を実線で示す。主アンテナ１１のアンテナゲインをＧmain、Σビームａの受信信号における妨害抑圧後の残留電力をＮmainとすると、Σビームａでの受信強度は｜Ｇmain・Ｓ１＋Ｎmain｜となる。 Here, when signal 1 (S1) and signal 2 (S2) arrive at the same time, and signal 2 is an interference signal,
| S2 | (Reception strength of signal 2) >> | S1 | (Reception strength of signal 1)
Is satisfied, the component of the signal 2 that is a disturbing signal is suppressed by the SLC process in the signal received by the Σ beam a. Therefore, the received signal of the Σ beam a input to the SLB processing unit 14 is only (signal 1) + (residual component after interference suppression of signal 2). FIG. 4 shows the received intensity distribution after interference suppression of the main antenna 11 by a solid line. Assuming that the antenna gain of the main antenna 11 is Gmain and the residual power after suppression of interference in the received signal of the Σ beam a is Nmain, the received intensity at the Σ beam a is | Gmain · S1 + Nmain |.

これに対し、従来方式の場合、補助ビームｂ１で受信した信号についてはＳＬＣ処理による妨害抑圧がなされないため、補助ビームｂ１では信号１＋信号２が受信される。図４に補助アンテナ１２１の受信強度分布を点線で示す。補助アンテナ１２１のアンテナゲインをＧauxとすると、補助アンテナ１２１での受信強度は｜Ｇaux・Ｓ１＋Ｇaux・Ｓ２｜となる。｜Ｓ２｜＞＞｜Ｓ１｜より、
｜Ｇmain・Ｓ１＋Ｎmain｜＜＜｜Ｇaux・Ｓ１＋Ｇaux・Ｓ２｜
となる場合があり、従来方式では妨害環境下において信号１を検出できない場合が生じる。したがって、従来方式では、妨害環境下ではＳＬＢ処理を実施することができない。 On the other hand, in the case of the conventional method, since the signal received by the auxiliary beam b1 is not subjected to interference suppression by the SLC process, the signal 1 + signal 2 is received by the auxiliary beam b1. FIG. 4 shows the received intensity distribution of the auxiliary antenna 121 by dotted lines. If the antenna gain of the auxiliary antenna 121 is Gaux, the reception intensity at the auxiliary antenna 121 is | Gaux · S1 + Gaux · S2 |. From | S2 | >> | S1 |
｜ Gmain · S1 + Nmain | << | Gaux · S1 + Gaux · S2 |
In some cases, the conventional method cannot detect the signal 1 in an interference environment. Therefore, in the conventional method, the SLB process cannot be performed in a disturbing environment.

本実施の形態では、Σビームａ及び補助ビームｂ１のいずれもＳＬＣ処理によって妨害抑圧を行っている。補助アンテナ１２１での妨害抑圧後の残留電力をＮauxとすると、補助アンテナ１２１での受信強度は｜Ｇaux・Ｓ１＋Ｎaux｜となる。 In the present embodiment, both the Σ beam a and the auxiliary beam b1 perform interference suppression by SLC processing. When the residual power after interference suppression at the auxiliary antenna 121 is Naux, the reception intensity at the auxiliary antenna 121 is | Gaux · S1 + Naux |.

図４に補助アンテナ１２１の妨害抑圧後の受信強度分布を一点鎖線で示す。主アンテナ１１と補助アンテナ１２１のそれぞれにおけるＳＬＣ処理後の妨害残留電力特性から、予めＳＬＣオン時のＳＬＢ処理部１４に設定する係数Ｋ１の値を次式が成立するように定めておく。
｜Ｇmain・Ｓ１＋Ｎmain｜＞＞Ｋ１・｜Ｇaux・Ｓ１＋Ｎaux｜
これにより、妨害環境下でもＳＬＢ処理が有効となる。この結果、サイドローブからの信号検出を排除し、メインローブの受信信号のみを抽出して、目標からのエコー成分を確実に検出することが可能となる。 FIG. 4 shows a received intensity distribution after interference suppression of the auxiliary antenna 121 by a one-dot chain line. From the interference residual power characteristics after the SLC processing in each of the main antenna 11 and the auxiliary antenna 121, the value of the coefficient K1 set in the SLB processing unit 14 when the SLC is on is determined in advance so that the following equation is established.
| Gmain · S1 + Nmain | >> K1 · | Gaux · S1 + Naux |
As a result, the SLB process is effective even in a disturbing environment. As a result, signal detection from the side lobe can be eliminated, and only the main lobe reception signal can be extracted to reliably detect the echo component from the target.

以上のように、上記構成による目標検出レーダ装置は、妨害信号を受信するような場合でも、ＳＬＣ処理による妨害抑圧を実施することができ、同時に、ＳＬＢ処理により、Σビームのサイドローブの受信信号を除去して、Σビームのメインローブで受信した信号を検出することができる。 As described above, the target detection radar apparatus having the above configuration can perform interference suppression by the SLC process even when receiving the interference signal, and at the same time, the received signal of the side lobe of the Σ beam by the SLB process. The signal received by the main lobe of the Σ beam can be detected.

また、ＳＬＣ処理のオン・オフ制御に応じて、ＳＬＢ処理の係数Ｋの値を切り換えることにより、妨害抑圧後の残留電力を考慮した係数設定を行うことができ、サイドローブ方向からの目標やクラッタ等を誤検出することのない、効果的なＳＬＢ処理を行うことができる。 Further, by switching the value of the coefficient K of the SLB process according to the on / off control of the SLC process, the coefficient setting considering the residual power after interference suppression can be performed, and the target and clutter from the side lobe direction can be set. It is possible to perform effective SLB processing without erroneously detecting the above.

（第２の実施の形態）
図５は、本発明に係る目標検出レーダ装置の第２の実施の形態の構成を示すブロック図である。尚、図５において、図１と同一部分には同一符号を付して示し、重複する説明を省略する。 (Second Embodiment)
FIG. 5 is a block diagram showing the configuration of the second embodiment of the target detection radar apparatus according to the present invention. In FIG. 5, the same parts as those in FIG.

図５に示す目標検出レーダ装置は、複数の妨害信号（最大Ｎ波）が到来した場合の妨害抑圧機能を実現するもので、主アンテナ１１、第１乃至第Ｎ＋１の補助アンテナ１２１〜１２Ｎ＋１、Ｎ段のＳＬＣ処理部１３１１〜１３１Ｎ＋１，１３２１〜１３２Ｎ，１３３１〜１３３Ｎ−１，…，１３Ｎ１〜１３Ｎ２、ＳＬＢ処理部１４及び係数発生部１５より構成される。 The target detection radar apparatus shown in FIG. 5 realizes a jamming suppression function when a plurality of jamming signals (maximum N waves) arrive. The main antenna 11, first to N + 1 auxiliary antennas 121 to 12N + 1, N The SLC processing units 1311 to 131N + 1, 1321 to 132N, 1331 to 133N-1,..., 13N1 to 13N2, the SLB processing unit 14 and the coefficient generation unit 15 are configured.

第１乃至第Ｎ＋１の補助アンテナ１２１〜１２Ｎ＋１は、いずれも主アンテナ１１のサイドローブ領域まで包含するように広い覆域をカバーする補助ビームを形成する。ＳＬＣ処理部１３１１〜１３１Ｎ＋１，１３２１〜１３２Ｎ，１３３１〜１３３Ｎ−１，…，１３Ｎ１〜１３Ｎ２は、いずれも図１のＳＬＣ処理部１３１，１３２と同構成である。 Each of the first to N + 1th auxiliary antennas 121 to 12N + 1 forms an auxiliary beam that covers a wide coverage so as to cover even the side lobe region of the main antenna 11. The SLC processing units 1311 to 131N + 1, 1321 to 132N, 1331 to 133N-1,..., 13N1 to 13N2 all have the same configuration as the SLC processing units 131 and 132 of FIG.

以下では、説明を容易にするため、Ｎ＝２の場合について記載する。Ｎ＝２の場合は、異なる２波（以下、信号強度の強い順に第１の妨害信号、第２の妨害信号と記す）の妨害信号まで抑圧できる。 Hereinafter, for ease of explanation, a case where N = 2 is described. In the case of N = 2, it is possible to suppress interference signals of two different waves (hereinafter referred to as a first interference signal and a second interference signal in descending order of signal intensity).

主アンテナ１１で受信された受信信号はＳＬＣ処理部１３１１に入力される。一方、第１の補助アンテナ１２１で受けた受信信号は２分配され、ＳＬＣ処理部１３１１，１３１２に入力される。また、第２の補助アンテナ１２２で受けた受信信号は２分配され、ＳＬＣ処理部１３１２，１３１３に入力される。第３の補助アンテナ１２３で受けた受信信号はＳＬＣ処理部１３１３に入力される。 A reception signal received by the main antenna 11 is input to the SLC processing unit 1311. On the other hand, the received signal received by the first auxiliary antenna 121 is divided into two and input to the SLC processing units 1311 and 1312. Also, the received signal received by the second auxiliary antenna 122 is divided into two and input to the SLC processing units 1312 and 1313. A reception signal received by the third auxiliary antenna 123 is input to the SLC processing unit 1313.

ＳＬＣ処理部１３１１では、外部から入力されるＳＬＣオン・オフ制御信号（制御手段）に従い、主アンテナ１１の受信信号から第１の妨害信号成分の抑圧を行う。同様に、ＳＬＣ処理部１３１２では、ＳＬＣオン・オフ制御信号に従い、第１の補助アンテナ１２１の受信信号から第１の妨害信号成分の抑圧を行う。同様に、ＳＬＣ処理部１３１３では、ＳＬＣオン・オフ制御信号に従い、第２の補助アンテナ１２２の受信信号から第１の妨害信号成分の抑圧を行う。 The SLC processing unit 1311 suppresses the first interference signal component from the received signal of the main antenna 11 in accordance with an SLC on / off control signal (control means) input from the outside. Similarly, the SLC processing unit 1312 suppresses the first interference signal component from the received signal of the first auxiliary antenna 121 according to the SLC on / off control signal. Similarly, the SLC processing unit 1313 suppresses the first disturbing signal component from the received signal of the second auxiliary antenna 122 according to the SLC on / off control signal.

第１の妨害信号が抑圧された主アンテナ１１の受信信号はＳＬＣ処理部１３２１に入力される。また、第１の妨害信号が抑圧された第１の補助アンテナ１２１の受信信号は２分配され、ＳＬＣ処理部１３２１，１３２２に入力される。また、第１の妨害信号が抑圧された第２の補助アンテナ１２２の受信信号はＳＬＣ処理部１３２２に入力される。 The reception signal of the main antenna 11 in which the first interference signal is suppressed is input to the SLC processing unit 1321. Further, the received signal of the first auxiliary antenna 121 in which the first interference signal is suppressed is divided into two and input to the SLC processing units 1321 and 1322. In addition, the reception signal of the second auxiliary antenna 122 in which the first interference signal is suppressed is input to the SLC processing unit 1322.

ＳＬＣ処理部１３２１では、ＳＬＣオン・オフ制御信号に従い、第１の妨害信号が抑圧された主アンテナ１１の受信信号から第２の妨害信号成分の抑圧を行う。同様に、ＳＬＣ処理部１３２２では、ＳＬＣオン・オフ制御信号に従い、第１の妨害信号が抑圧された第１の補助アンテナ１２１の受信信号から第２の妨害信号成分の抑圧を行う。 The SLC processing unit 1321 suppresses the second interference signal component from the received signal of the main antenna 11 in which the first interference signal is suppressed in accordance with the SLC on / off control signal. Similarly, the SLC processing unit 1322 suppresses the second interference signal component from the received signal of the first auxiliary antenna 121 in which the first interference signal is suppressed in accordance with the SLC on / off control signal.

第１及び第２の妨害信号が抑圧された主アンテナ１１の受信信号と、第１及び第２の妨害信号が抑圧された第１の補助アンテナ１２１の受信信号はＳＬＢ処理部１４に入力される。このＳＬＢ処理部１４では、第１の実施の形態と同様に、係数Ｋが乗算された第１の補助アンテナ１２１の妨害抑圧後の受信信号振幅と主アンテナ１１の妨害抑圧後の受信信号振幅とレベル比較し、この比較結果からメインローブで受信された信号かサイドローブで受信された信号かを判別し、サイドローブの受信信号は除去し、メインローブの受信信号のみを出力する。 The received signal of the main antenna 11 in which the first and second disturbing signals are suppressed and the received signal of the first auxiliary antenna 121 in which the first and second disturbing signals are suppressed are input to the SLB processing unit 14. . In this SLB processing unit 14, as in the first embodiment, the received signal amplitude after interference suppression of the first auxiliary antenna 121 multiplied by the coefficient K and the received signal amplitude after interference suppression of the main antenna 11 are multiplied. The level comparison is performed, and it is determined from the comparison result whether the signal is received at the main lobe or the side lobe, the received signal at the side lobe is removed, and only the received signal at the main lobe is output.

ここで、ＳＬＢ処理部１４で使用する係数Ｋは、第１の実施の形態と同様に、外部から設定されるＳＬＣオン・オフ制御信号に従って、それぞれ異なる係数値Ｋ０，Ｋ１を係数発生部１５から切換出力されるようにする。 Here, the coefficient K used in the SLB processing unit 14 is obtained from the coefficient generation unit 15 according to different coefficient values K0 and K1, respectively, according to the SLC on / off control signal set from the outside, as in the first embodiment. The output is switched.

以上の説明ではＮ＝２としたが、Ｎが３以上の場合でも同様であり、いずれもＮ方向からの妨害信号が抑圧された主アンテナ１１の受信信号と第１の補助アンテナ１２１の受信信号を得てＳＬＢ処理を行うことになる。 Although N = 2 in the above description, the same applies to the case where N is 3 or more. In both cases, the reception signal of the main antenna 11 and the reception signal of the first auxiliary antenna 121 in which the interference signal from the N direction is suppressed. SLB processing is performed.

したがって、上記構成による目標検出レーダ装置は、Ｎ方向から到来する妨害信号を受信するような場合でも、各妨害信号についてＳＬＣ処理による妨害抑圧を実施することができ、同時に、ＳＬＢ処理により、Σビームのサイドローブの受信信号を除去して、Σビームのメインローブで受信した信号を検出することができる。 Therefore, even when the target detection radar apparatus having the above-described configuration receives a jamming signal coming from the N direction, the jamming suppression by the SLC process can be performed on each jamming signal. The signal received by the main lobe of the Σ beam can be detected by removing the received signal of the side lobe.

また、本実施の形態においても、ＳＬＣ処理のオン・オフ制御に応じて、ＳＬＢ処理の係数Ｋの値を切り換えることにより、妨害抑圧後の残留電力を考慮した係数設定を行うことができ、サイドローブ方向からの目標やクラッタ等を誤検出することのない、効果的なＳＬＢ処理を行うことができる。 Also in the present embodiment, by switching the value of the coefficient K of the SLB process according to the on / off control of the SLC process, it is possible to set the coefficient in consideration of the residual power after interference suppression. Effective SLB processing can be performed without erroneously detecting targets, clutter, and the like from the lobe direction.

以上本発明の実施の形態について説明してきたが、本発明はこれに限定されることなく請求項の記載の範囲内において各種の変形、変更が可能なことは当業者には自明であろう。 Although the embodiments of the present invention have been described above, it will be obvious to those skilled in the art that the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the claims.

本発明に係る目標検出レーダ装置の第１の実施の形態の構成を示すブロック図。1 is a block diagram showing the configuration of a first embodiment of a target detection radar apparatus according to the present invention. 上記実施の形態のＳＬＣ処理の動作を説明するアンテナビームパターンを示す説明図。Explanatory drawing which shows the antenna beam pattern explaining operation | movement of the SLC process of the said embodiment. 上記実施の形態のＳＬＢ処理の動作を説明するアンテナビームパターンを示す説明図。Explanatory drawing which shows the antenna beam pattern explaining operation | movement of the SLB process of the said embodiment. 上記実施の形態において、主アンテナ及び補助アンテナの妨害抑圧後の受信信号強度変化を示す特性図。The characteristic view which shows the received signal strength change after disturbance suppression of the main antenna and an auxiliary antenna in the said embodiment. 本発明に係る目標検出レーダ装置の第２の実施の形態の構成を示すブロック図。The block diagram which shows the structure of 2nd Embodiment of the target detection radar apparatus which concerns on this invention.

Explanation of symbols

１１主アンテナ
１２１〜１２Ｎ＋１補助アンテナ
１３１，１３２，１３１１〜１３１Ｎ＋１，１３２１〜１３２Ｎ，１３３１〜１３３Ｎ−１，…，１３Ｎ１〜１３Ｎ２ＳＬＣ処理部
１４ＳＬＢ処理部
１５係数発生部
Ａ１減算器
Ａ２乗算器
Ａ３ローパスフィルタ
Ａ４切換器
Ａ５乗算器
Ｂ１乗算器
Ｂ２振幅比較器 11 Main antenna
121-12N + 1 Auxiliary antenna
131,132,1311-131N + 1,1321-132N, 1331-133N-1, ..., 13N1-13N2 SLC processor
14 SLB processor
15 Coefficient generator
A1 subtractor
A2 multiplier
A3 Low-pass filter
A4 selector
A5 multiplier
B1 multiplier
B2 Amplitude comparator

Claims

A main antenna forming a main beam;
First and second auxiliary antennas each forming an auxiliary beam covering a wide coverage area to encompass the side lobe region of the main beam;
The unnecessary signal component of the main beam received signal is suppressed by correcting and subtracting the amplitude and phase of the first auxiliary beam received signal obtained by the first auxiliary antenna from the main beam received signal obtained by the main antenna. First SLC (sidelobe canceller) processing means to
The first auxiliary beam is obtained by correcting and subtracting the amplitude and phase of the second auxiliary beam received signal obtained by the second auxiliary antenna from the first auxiliary beam received signal obtained by the first auxiliary antenna. Second SLC processing means for suppressing unnecessary signal components of the received signal;
The amplitude of the reception signal output from the first SLC processing means is compared with the amplitude obtained by multiplying the reception signal output from the second SLC processing means by a predetermined coefficient value. SLB (sidelobe blanking) processing means for discriminating between a signal received by the main lobe of the antenna and a signal received by the side lobe, removing the reception signal of the side lobe, and outputting only the reception signal of the main lobe; A radar apparatus comprising:

A control means for controlling on / off of the processing of the first and second SLC processing means, and a coefficient value switching means for switching a coefficient value of the SLB processing means in accordance with on / off of the control means. Item 2. The radar device according to item 1.

A main antenna forming a main beam;
1st to N + 1th (N is a natural number of 2 or more) auxiliary antennas that form auxiliary beams covering a wide area so as to cover each side lobe area of the main beam;
The unnecessary signal component of the main beam received signal is suppressed by correcting and subtracting the amplitude and phase of the first auxiliary beam received signal obtained by the first auxiliary antenna from the main beam received signal obtained by the main antenna. First SLC (sidelobe canceller) processing means to
The amplitude and phase of the (i + 1) th auxiliary beam reception signal obtained by the (i + 1) th auxiliary antenna from the ith auxiliary beam reception signal obtained by the ith (i is a natural number from 1 to N) auxiliary antenna. Second to (N + 1) th SLC processing means for suppressing unnecessary signal components of the i-th auxiliary beam received signal by correcting and subtracting;
By correcting and subtracting the amplitude and phase of the received signal obtained by the k + 1 SLC processing unit from the received signal obtained by the kth (k is a natural number from 1 to N) SLC processing unit. SLC processing for suppressing unnecessary signal components of the received signal obtained by the SLC processing means is performed stepwise according to the number of auxiliary antennas, and finally the unnecessary signal component suppression result of the main beam received signal and the first SLC output processing means for outputting the auxiliary beam unnecessary signal component suppression result of
The amplitude of the unwanted signal component suppression result of the main beam received signal is compared with the amplitude obtained by multiplying the unwanted signal suppression result of the first auxiliary beam received signal by a predetermined coefficient value. SLB (sidelobe blanking) processing means for discriminating between a signal received by the main lobe and a signal received by the side lobe, removing the reception signal of the side lobe, and outputting only the reception signal of the main lobe A radar device characterized by:

Control means for controlling on / off of all processes of the first to N + 1th SLC processing means and the SLC output processing means, and a coefficient value for switching the coefficient value of the SLB processing means in accordance with on / off of the control means The radar apparatus according to claim 3, further comprising switching means.