JPH035910Y2 - - Google Patents
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- Publication number
- JPH035910Y2 JPH035910Y2 JP2160184U JP2160184U JPH035910Y2 JP H035910 Y2 JPH035910 Y2 JP H035910Y2 JP 2160184 U JP2160184 U JP 2160184U JP 2160184 U JP2160184 U JP 2160184U JP H035910 Y2 JPH035910 Y2 JP H035910Y2
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- JP
- Japan
- Prior art keywords
- signal
- interference
- judgment
- detector
- feedback
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 5
- 230000003111 delayed effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 1
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- Radar Systems Or Details Thereof (AREA)
Description
【考案の詳細な説明】
(1) 考案の属する技術分野の説明
本考案は、パルスレーダ装置の信号処理等に用
いられる干渉信号除去器に関する。[Detailed description of the invention] (1) Description of the technical field to which the invention pertains The present invention relates to an interference signal remover used for signal processing of pulse radar equipment.
(2) 従来技術の説明
従来、この種の干渉信号除去器、たとえばパル
スレーダ装置の受信機で位相検波された受信ビデ
オ信号に対して、MTI（Moving Target
Indication）処理やCFAR（Constant False
Alarm Rate）処理等（例えば、M.I.Skolnik等
の“Radar Hand Book”chap.17及び
Section5.8参照）の信号処理を行い目標物体以外
の固定目標（たとえば山岳、森林）等からの不要
信号（以下、クラツタ信号という）の除去、抑圧
を行つた信号処理ビデオ信号に対して、他のレー
ダ装置からの送信電波やレーダ装置の探知距離外
から反射された不要な電波（２次エコー）、その
他の外来雑音等の１送信周期（以下この送信周期
をスイープという）に現われる不要ビデオ信号を
除去するためのものである。(2) Description of the prior art Conventionally, this type of interference signal remover, for example, moving target
Indication) processing and CFAR (Constant False)
Alarm Rate) processing, etc. (for example, “Radar Hand Book” chap. 17 of MISkolnik et al.
For signal processing video signals that have undergone signal processing (see Section 5.8) and removed and suppressed unnecessary signals (hereinafter referred to as clutter signals) from fixed targets other than target objects (e.g. mountains, forests), etc. Unwanted video signals that appear in one transmission cycle (hereinafter, this transmission cycle is referred to as a sweep) such as radio waves transmitted from radar equipment, unnecessary radio waves reflected from outside the detection range of radar equipment (secondary echo), and other external noise. It is intended to remove.
受信機の信号処理におけるMTI処理において
はクラツタ信号の抑圧度を高めるために、通常、
特定の帰還係数を有する帰還付き消去器（例え
ば、前記、“Radar Hand Book”chap.17参照）
が用いられる。帰還付きの場合、干渉信号が１ス
イープのみ入力されると信号処理のビデオ出力信
号としては、帰還によつて減衰していく処理信号
が継続して得られる。例えば、２重消去器
（“Radar Hand Book”chap.17参照）において
は、無帰還（帰還係数が０）の場合、干渉信号が
入力されると３スイープに渡り処理信号が得られ
るが、帰還がある場合には、３スイープ以降も減
衰された処理信号が複数スイープ続いて得られ
る。また、干渉除去の方法としては、入力信号レ
ベルに対して干渉判定レベルを設ける方法もあ
る。しかし、この場合、干渉判定レベルを越えた
信号のスイープ毎の相関により干渉信号か否かを
判定しなければならない。そのため、干渉判定用
スイープ数を少なくすると回路構成は容易となる
が、目標信号は複数スイープの間得られるため、
干渉信号との識別が出来なくなる。帰還つき消去
器を使用した場合干渉判定レベル以上の信号が無
帰還の消去器と比べて多くのスイープに現われる
ために目標信号との識別が悪くなるといつた欠点
があつた。 In MTI processing in receiver signal processing, in order to increase the degree of suppression of clutter signals,
Feedback canceler with a specific feedback coefficient (see e.g. “Radar Hand Book” chapter 17 above)
is used. In the case with feedback, if only one sweep of the interference signal is input, a processed signal that is attenuated by feedback is continuously obtained as a video output signal of signal processing. For example, in a double canceler (see "Radar Hand Book" chapter 17), if there is no feedback (feedback coefficient is 0), when an interference signal is input, a processed signal is obtained over three sweeps, but the In some cases, the attenuated processed signal is obtained continuously for multiple sweeps even after the third sweep. Further, as a method of interference cancellation, there is also a method of providing an interference determination level for the input signal level. However, in this case, it is necessary to determine whether or not the signal is an interference signal based on the correlation for each sweep of the signal exceeding the interference determination level. Therefore, reducing the number of sweeps for interference determination makes the circuit configuration easier, but since the target signal is obtained during multiple sweeps,
It becomes impossible to distinguish it from interference signals. When a canceler with feedback is used, signals exceeding the interference determination level appear in more sweeps than with a canceler without feedback, resulting in poor discrimination from the target signal.
(3) 考案の目的の説明
本考案は、帰還つきの信号処理からのビデオ信
号の干渉信号判定系に対して、帰還なしの消去器
を含んだ干渉信号判定系を加えることによつて、
上記欠点を解決して、目標信号と干渉信号との識
別を容易にした干渉信号除去器を提供するもので
ある。(3) Explanation of the purpose of the invention The present invention adds an interference signal determination system including a canceler without feedback to the interference signal determination system for video signals from signal processing with feedback.
The object of the present invention is to provide an interference signal remover that solves the above drawbacks and makes it easy to distinguish between a target signal and an interference signal.
(4) 考案の構成
本考案は受信機で位相検波された受信ビデオ信
号を受けて、不要な固定目標信号等を除去する無
帰還型消去器、無帰還型消去器の出力信号に対し
て信号レベル判定及び複数の送信周期の変化を判
定条件と照合し干渉信号の判定を行う干渉検出
器、受信ビデオ信号を２重消去器等の帰還型消去
器によるMTI処理などで信号処理することによ
つて得られる処理ビデオ信号に対して信号レベル
判定を行ない、干渉判定信号を発生する信号処理
干渉検出器、前記干渉検出器からの第１の干渉判
定信号及び前記信号処理干渉検出器からの第２の
干渉判定信号を入力して相互の相関関係に基いて
前記処理ビデオ信号の干渉信号の判別を行い干渉
除去信号を発生する干渉除去信号発生器、処理ビ
デオ信号を干渉除去信号発生器からの干渉除去信
号によつて除去する干渉除去ゲートを設けること
によつて構成される。(4) Structure of the invention The present invention is a non-feedback type canceler that removes unnecessary fixed target signals, etc. by receiving a received video signal that has been phase-detected by a receiver. Interference detectors perform level judgment and determine interference signals by comparing changes in multiple transmission cycles with judgment conditions, and signal processing is performed on the received video signal using MTI processing using a feedback canceller such as a double canceler. a signal processing interference detector that performs a signal level judgment on the processed video signal obtained by the process and generates an interference judgment signal; a first interference judgment signal from the interference detector; and a second interference judgment signal from the signal processing interference detector. an interference cancellation signal generator that inputs an interference judgment signal of the processed video signal and generates an interference cancellation signal by discriminating the interference signal of the processed video signal based on the mutual correlation; It is constructed by providing an interference cancellation gate that cancels using a cancellation signal.
(5) 考案の実施例の説明
次に本考案の一実施例について図面を参照して
説明する。(5) Description of an embodiment of the invention Next, an embodiment of the invention will be described with reference to the drawings.
第１図に本考案の一実施例であるパルスレーダ
装置の信号処理装置を示す。第２図に一実施例の
信号処理装置の動作を説明するための干渉信号と
目標信号とが入力された場合の各部の出力波形の
概略図を示す。 FIG. 1 shows a signal processing device for a pulse radar device which is an embodiment of the present invention. FIG. 2 shows a schematic diagram of output waveforms of each section when an interference signal and a target signal are inputted, for explaining the operation of the signal processing device of one embodiment.
パルスレーダ装置の受信機で位相検波された受
信ビデオ信号は、入力端子１から入力され、２分
割されてひとつは帰還つきMTI処理を行う信号
処理器３へ、他のひとつは干渉信号除去器４内の
無帰還消去器１１へ共通に加えられる。無帰還消
去器１１では、受信ビデオ信号に含まれる固定目
標信号を除去、抑圧した処理信号を発生して干渉
検出器１２に送出する。無帰還消去器１１の処理
信号は、消去回路の構成により、出力されるスイ
ープ数が異なる。単一消去回路の場合を考える
と、１スイープの信号入力に対して、２スイープ
に渡り出力が得られる。干渉検出器１２は、無帰
還消去器１１からの処理信号の振幅に対し干渉判
定レベルを設け、その判定レベルを越えた信号に
ついて複数スイープ分を蓄積し複数スイープでの
変化を判定条件と照合して処理信号の干渉判定を
行い干渉判定信号を干渉除去信号発生器１４に送
出する。信号処理器３の出力は信号処理干渉検出
器１３に入力されて干渉判定レベルを越えた信号
が、干渉判定信号として干渉除去信号発生器１４
に送出される。干渉除去信号発生器１４では、内
部メモリーに干渉信号検出器１２からの干渉判定
信号が複数スイープ分記憶され、このメモリーの
出力と信号処理干渉信号検出器１３との干渉判定
信号との相関結果を予め設定してある判定条件と
照合して干渉信号かあるいは目標信号かの判定が
行われ、干渉除去信号を発生して干渉除去ゲート
１５に送出する。干渉除去ゲート１５には信号処
理器３からのビデオ信号と干渉除去信号発生器１
４からの干渉除去信号とが入力され、干渉ビデオ
信号が干渉除去信号によつて除去される。出力端
子２には干渉除去ゲート１５からの干渉除去され
たビデオ信号が出力される。 A received video signal whose phase has been detected by the receiver of the pulse radar device is input from the input terminal 1 and is divided into two parts, one of which is sent to a signal processor 3 that performs MTI processing with feedback, and the other to an interference signal remover 4. It is commonly applied to the non-feedback eraser 11 in the. The non-feedback canceler 11 removes and suppresses the fixed target signal contained in the received video signal, generates a processed signal, and sends it to the interference detector 12. The number of sweeps output from the processed signal of the non-feedback eraser 11 differs depending on the configuration of the eraser circuit. Considering the case of a single erase circuit, for one sweep of signal input, outputs are obtained over two sweeps. The interference detector 12 sets an interference judgment level for the amplitude of the processed signal from the non-feedback canceler 11, accumulates signals from multiple sweeps for signals exceeding the judgment level, and compares changes in the multiple sweeps with judgment conditions. interference determination is made on the processed signal, and an interference determination signal is sent to the interference cancellation signal generator 14. The output of the signal processor 3 is input to the signal processing interference detector 13, and the signal exceeding the interference determination level is sent to the interference cancellation signal generator 14 as an interference determination signal.
sent to. The interference cancellation signal generator 14 stores a plurality of sweeps of the interference determination signal from the interference signal detector 12 in its internal memory, and calculates the correlation result between the output of this memory and the interference determination signal from the signal processing interference signal detector 13. It is determined whether the signal is an interference signal or a target signal by comparing with preset determination conditions, and an interference cancellation signal is generated and sent to the interference cancellation gate 15. The interference cancellation gate 15 receives the video signal from the signal processor 3 and the interference cancellation signal generator 1.
The interference cancellation signal from No. 4 is input, and the interference video signal is canceled by the interference cancellation signal. The interference-cancelled video signal from the interference-cancelling gate 15 is output to the output terminal 2 .
以上説明した実施例の出力波形の概略図を第２
図に示し、これについて説明する。 A schematic diagram of the output waveform of the embodiment explained above is shown in the second diagram.
It is shown in the figure and will be explained.
ビデオ信号２１として、目標信号３１と干渉信
号３２を考える。目標信号３１は、通常、複数ス
イープに渡り信号が存在していて、本例では５ス
イープ連続しているものとしている。無帰還消去
器出力信号２２は、消去回路として単一消去回路
の使用により、入力信号２１に対して、１スイー
プ分余分に出力が得られる。干渉検出器出力信号
２３は、無帰還消去器出力信号２２が干渉検出器
１２においてレベル判定されたのち４スイープ相
関された信号である（本例では４スイープ全てに
信号があるか、最新の３スイープに信号がある場
合以外を干渉信号としている。）。信号処理器出力
信号２４は、信号処理器３において帰還つきの
MTI処理された信号であり、干渉信号の遅延信
号３６と目標信号の遅延信号３７を有している。
信号処理器出力信号２４を信号処理干渉検出器１
３に入力してレベル判定された信号で３スイープ
にわたり遅延信号が得られている場合の信号処理
干渉検出器出力信号２５である。干渉除去信号２
６は、干渉検出器出力信号２３と信号処理干渉検
出器出力信号２５とを干渉除去信号発生器１４に
入力して、相関処理して得られた信号である（本
例では、干渉検出器で干渉信号と判定された信号
処理検出器の出力信号及び干渉検出器で干渉信号
と判定されていないが、信号処理干渉検出器の出
力信号があり、過去３スイープにわたり、干渉検
出器の干渉判定信号がある信号処理干渉検出器の
出力信号が干渉除去信号として出力される。）。出
力端子出力信号２７は、信号処理器出力信号２４
が干渉除去ゲート１５において、干渉除去信号２
６によつて干渉除去された信号である。 Consider a target signal 31 and an interference signal 32 as the video signal 21. The target signal 31 usually exists over a plurality of sweeps, and in this example, it is assumed that there are five consecutive sweeps. The non-feedback eraser output signal 22 can be outputted by one sweep more than the input signal 21 by using a single eraser circuit as an eraser circuit. The interference detector output signal 23 is a signal obtained by correlating the level of the non-feedback canceler output signal 22 in the interference detector 12 and then 4 sweeps (in this example, there is a signal in all 4 sweeps, or the latest 3 Any signal other than the one in the sweep is considered an interference signal.) The signal processor output signal 24 is processed by the signal processor 3 with feedback.
This is a signal that has been subjected to MTI processing, and includes a delayed signal 36 of the interference signal and a delayed signal 37 of the target signal.
Signal processor output signal 24 is processed by signal processing interference detector 1
This is the output signal 25 of the signal processing interference detector when a delayed signal is obtained over three sweeps using the signal inputted to the signal processing apparatus 3 and whose level is determined. Interference cancellation signal 2
6 is a signal obtained by inputting the interference detector output signal 23 and the signal processing interference detector output signal 25 to the interference cancellation signal generator 14 and performing correlation processing (in this example, the interference detector output signal 25 is There is an output signal of the signal processing interference detector that was determined to be an interference signal and an output signal of the signal processing interference detector that was not determined to be an interference signal by the interference detector, and for the past three sweeps, the interference determination signal of the interference detector The output signal of a signal processing interference detector is output as an interference cancellation signal.) The output terminal output signal 27 is the signal processor output signal 24
is the interference canceled signal 2 at the interference cancellation gate 15.
This is a signal whose interference has been removed by 6.
(6) 考案の効果の説明
本考案は、以上説明したように、信号処理ビデ
オ信号の干渉検出系に無帰還消去器を含んだ干渉
検出系を加えた構成とすることによつて信号処理
ビデオ信号の干渉信号を目標信号と識別して、干
渉信号の除去を容易とする効果がある。(6) Description of the effects of the invention As explained above, the present invention has a configuration in which an interference detection system including a non-return canceler is added to an interference detection system for signal processing video signals. This has the effect of distinguishing the interference signal from the target signal and facilitating the removal of the interference signal.
第１図は、本考案の一実施例の信号処理装置の
ブロツク図である。第２図は、本考案の一実施例
の信号処理装置の干渉信号と目標信号を入力した
場合の各部の出力波形図である。
１……入力端子、２……出力端子、３……信号
処理器、４……干渉信号除去器、１１……無帰還
消去器、１２……干渉検出器、１３……信号処理
干渉検出器、１４……干渉除去信号発生器、１５
……干渉除去ゲート、２１……入力端子波形、２
２……無帰還消去器出力波形、２３……干渉検出
器出力波形、２４……信号処理器出力波形、２５
……信号処理干渉検出器出力波形、２６……干渉
除去信号、２７……出力端子出力波形、３１……
目標信号、３２……干渉信号、３３……干渉判定
信号、３４……信号処理干渉判定信号、３５……
干渉除去信号、３６……干渉信号の帰還信号、３
７……目標信号の帰還信号。
FIG. 1 is a block diagram of a signal processing device according to an embodiment of the present invention. FIG. 2 is an output waveform diagram of each part of the signal processing device according to an embodiment of the present invention when an interference signal and a target signal are input. 1... Input terminal, 2... Output terminal, 3... Signal processor, 4... Interference signal remover, 11... Non-feedback canceller, 12... Interference detector, 13... Signal processing interference detector , 14... Interference cancellation signal generator, 15
...Interference removal gate, 21...Input terminal waveform, 2
2... Non-feedback canceller output waveform, 23... Interference detector output waveform, 24... Signal processor output waveform, 25
... Signal processing interference detector output waveform, 26 ... Interference cancellation signal, 27 ... Output terminal output waveform, 31 ...
Target signal, 32... Interference signal, 33... Interference determination signal, 34... Signal processing interference determination signal, 35...
Interference cancellation signal, 36...Return signal of interference signal, 3
7...Return signal of target signal.
Claims (1)
目標等に係る不要な目標信号を除去、抑圧する無
帰還型消去器と、無帰還型消去器の出力信号に対
して信号レベル判定及び判定結果を蓄積し過去の
複数送信周期の変化を判定条件と照合して干渉信
号の判定を行う干渉検出器と、前記受信ビデオ信
号を帰還型消去器を用いてMTI処理等で信号処
理した処理ビデオ信号に対して信号レベル判定を
行ない干渉判定信号を発生する信号処理干渉検出
器と、前記干渉検出器からの第１の干渉判定信号
及び前記信号処理干渉検出器からの第２の干渉判
定信号に基いて両者の相互相関関係によつて前記
処理ビデオ信号の干渉信号の判別を行い干渉除去
信号を発生する干渉除去信号発生器と、前記処理
ビデオ信号を前記干渉除去信号発生器からの前記
干渉除去信号によつて除去する干渉除去部とを有
することを特徴とする干渉信号除去器。 A non-feedback type canceler receives the phase-detected received video signal and removes and suppresses unnecessary target signals related to a fixed target, etc., and a signal level judgment and judgment result are performed for the output signal of the non-feedback type canceller. an interference detector that determines interference signals by comparing accumulated changes in multiple past transmission cycles with determination conditions; and a processed video signal that processes the received video signal by MTI processing or the like using a feedback eraser. a signal processing interference detector that performs a signal level judgment on the signal and generates an interference judgment signal; and a first interference judgment signal from the interference detector and a second interference judgment signal from the signal processing interference detector. an interference cancellation signal generator that determines the interference signal in the processed video signal based on a cross-correlation relationship between the two and generates an interference cancellation signal, and converts the processed video signal into the interference cancellation signal from the interference cancellation signal generator. 1. An interference signal remover, comprising: an interference remover that removes the interference signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2160184U JPS60134181U (en) | 1984-02-17 | 1984-02-17 | Interference signal remover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2160184U JPS60134181U (en) | 1984-02-17 | 1984-02-17 | Interference signal remover |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60134181U JPS60134181U (en) | 1985-09-06 |
| JPH035910Y2 true JPH035910Y2 (en) | 1991-02-14 |
Family
ID=30513138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2160184U Granted JPS60134181U (en) | 1984-02-17 | 1984-02-17 | Interference signal remover |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60134181U (en) |
-
1984
- 1984-02-17 JP JP2160184U patent/JPS60134181U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60134181U (en) | 1985-09-06 |
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