JP2000131420A - Unwanted signal suppressor - Google Patents
Unwanted signal suppressorInfo
- Publication number
- JP2000131420A JP2000131420A JP10319858A JP31985898A JP2000131420A JP 2000131420 A JP2000131420 A JP 2000131420A JP 10319858 A JP10319858 A JP 10319858A JP 31985898 A JP31985898 A JP 31985898A JP 2000131420 A JP2000131420 A JP 2000131420A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- unnecessary
- input signal
- arithmetic unit
- suppressing
- 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.)
- Pending
Links
- 230000001427 coherent effect Effects 0.000 claims abstract description 14
- 230000002123 temporal effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- Radar Systems Or Details Thereof (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、レーダ装置等の受
信信号に含まれる不要信号（クラッタ等）を抑圧する不
要信号抑圧装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unnecessary signal suppressing device for suppressing unnecessary signals (clutter, etc.) contained in a received signal of a radar device or the like.
【０００２】[0002]
【従来の技術】従来の不要信号抑圧装置の基本構成を図
２に示す。入力信号はレーダ装置等の信号処理器から出
力される同一空間座標のコヒーレントビデオ（位相成分
を保存したビデオ）である。図２において、１１は前記
入力信号の平均値を求める平均値算出器である。１２は
平均値算出器で得た平均値を持つ推定不要信号を生成す
る推定不要信号生成器である。１３は平均値算出器に入
力した前記入力信号から前記推定不要信号を引算する引
算器であり、その出力信号として前記入力信号から不要
信号成分を抑圧したものが得られる。2. Description of the Related Art FIG. 2 shows a basic configuration of a conventional unnecessary signal suppressing device. The input signal is a coherent video (video in which phase components are stored) of the same spatial coordinates output from a signal processor such as a radar device. In FIG. 2, reference numeral 11 denotes an average value calculator for calculating an average value of the input signal. Reference numeral 12 denotes an estimation unnecessary signal generator that generates an estimation unnecessary signal having an average value obtained by the average value calculator. Reference numeral 13 denotes a subtractor for subtracting the unnecessary estimation signal from the input signal input to the average value calculator, and an output signal of which is obtained by suppressing the unnecessary signal component from the input signal.
【０００３】その機能を説明する。入力信号はレーダ装
置のアンテナのビームが同一方向に指向されている間に
得た同一距離のコヒーレントビデオである。すなわち、
各送信パルスで得た各距離のコヒーレントビデオを下記
表１のように配列すると、入力信号は縦列の信号群とな
る。The function will be described. The input signal is the same distance coherent video obtained while the beam of the radar device antenna is pointed in the same direction. That is,
When the coherent videos of each distance obtained by each transmission pulse are arranged as shown in Table 1 below, the input signals are arranged in a column.
【０００４】[0004]
【表１】 ここで、Ｓ(ｍ,Ｒn)は、ｍ番目の送信パルスで得た、距
離Ｒnのコヒーレントビデオであることを表す。[Table 1] Here, S (m, R n ) indicates that the video is a coherent video with a distance R n obtained by the m-th transmission pulse.
【０００５】平均値算出器１１は入力された信号群の平
均値を求めるが、これは信号群に含まれる不要信号成分
を平均値（定数）で近似することに相当する。[0005] The average value calculator 11 calculates the average value of the input signal group, which is equivalent to approximating an unnecessary signal component included in the signal group by an average value (constant).
【０００６】次いで、推定不要信号生成器１２で前記平
均値を持つ推定不要信号を生成するが、これは平均値算
出器１１で求めた平均値を振幅値とする信号を作ること
に相当する。最後に、引算器１３で前記入力信号群から
前記推定不要信号を引算するが、これは前記入力信号群
から定数で近似した不要信号成分を除去することに相当
し、前記入力信号群に含まれる不要信号を抑圧した出力
信号を得る。Next, an unnecessary estimation signal having the average value is generated by the unnecessary estimation signal generator 12, which corresponds to generating a signal having the average value obtained by the average value calculator 11 as an amplitude value. Finally, the subtraction unit 13 subtracts the estimated unnecessary signal from the input signal group. This corresponds to removing an unnecessary signal component approximated by a constant from the input signal group. An output signal in which the unnecessary signal included is suppressed is obtained.
【０００７】他の従来の不要信号抑圧装置としては、同
一空間座標のコヒーレントビデオ間の差をとる方式や、
周波数フィルターで同一空間座標のコヒーレントビデオ
に含まれる特定の周波数成分を除去するものがある。[0007] Other conventional unnecessary signal suppressing devices include a method of taking a difference between coherent videos of the same spatial coordinates,
There is a frequency filter that removes a specific frequency component included in coherent video having the same spatial coordinates.
【０００８】しかし、前者は一般に目標信号の損失が大
きいという問題がある。また、後者は図２の装置の平均
値算出器の前に抑圧する特定の周波数成分を直流成分に
変換する周波数変換器を加えたものと考えることがで
き、基本的には図２の装置と同じと言える。However, the former has a problem that the loss of the target signal is generally large. In addition, the latter can be considered as adding a frequency converter for converting a specific frequency component to be suppressed into a DC component before the average value calculator of the apparatus of FIG. 2. You can say the same.
【０００９】[0009]
【発明が解決しようとする課題】上述の従来の装置は同
一空間座標のコヒーレントビデオに含まれる不要信号成
分を平均値（定数）で近似して除去するものである。こ
のため、同一空間座標の信号群の時間長（以下、観測時
間と呼ぶ）内で変動する不要信号成分は効果的に抑圧で
きないという問題があった。The above-mentioned conventional apparatus removes unnecessary signal components contained in coherent video having the same spatial coordinates by approximating them with an average value (constant). For this reason, there has been a problem that unnecessary signal components that fluctuate within the time length of a signal group having the same spatial coordinates (hereinafter referred to as observation time) cannot be effectively suppressed.
【００１０】本発明は、上記の問題を解決するためにな
されたもので、同一空間座標のコヒーレントビデオに含
まれる不要信号として、直流成分も含めて観測時間内の
変動が１周期以下の信号成分を効果的に抑圧可能な不要
信号抑圧装置を提供することを目的とする。The present invention has been made in order to solve the above-described problem. As unnecessary signals included in coherent video having the same spatial coordinates, signal components having a fluctuation within one cycle including observation of a DC component within one cycle are included. It is an object of the present invention to provide an unnecessary signal suppressing device capable of effectively suppressing the above.
【００１１】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.
【００１２】[0012]
【課題を解決するための手段】観測時間内の変動が１周
期以下の信号成分は１次式もしくは２次式で近似でき
る。従って、本発明の不要信号抑圧装置は、従来の装置
では不要信号成分を平均値で近似して除去しているのに
対して、不要信号成分を１次式もしくは２次式で近似し
て除去する手段を備える。A signal component whose fluctuation within the observation time is one cycle or less can be approximated by a linear expression or a quadratic expression. Therefore, the unnecessary signal suppressing device of the present invention removes unnecessary signal components by approximating them by a linear expression or a quadratic expression, whereas the conventional device removes unnecessary signal components by approximating the average value. Means for performing
【００１３】すなわち、本発明の不要信号抑圧装置は、
同一空間座標のコヒーレントビデオを入力信号とし、前
記入力信号の時間的変動を１次式もしくは２次式で近似
する第１の演算器と、該第１の演算器で求めた近似式に
従う推定不要信号を生成する第２の演算器と、前記入力
信号から対応する時間位置の前記推定不要信号を引算す
る引算器とを備え、前記入力信号に含まれる不要信号成
分を抑圧することを特徴としている。That is, the unnecessary signal suppressing apparatus according to the present invention comprises:
A first arithmetic unit that takes coherent video of the same spatial coordinates as an input signal and approximates a temporal variation of the input signal by a linear expression or a quadratic expression, and an estimation according to an approximate expression obtained by the first arithmetic unit is unnecessary. A second arithmetic unit for generating a signal; and a subtracter for subtracting the unnecessary estimation signal at a corresponding time position from the input signal, wherein an unnecessary signal component included in the input signal is suppressed. And
【００１４】[0014]
【発明の実施の形態】以下、本発明に係る不要信号抑圧
装置の実施の形態を図面に従って説明する。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of an unnecessary signal suppressing apparatus according to the present invention.
【００１５】本発明による不要信号抑圧装置の実施の形
態を図１に示す。入力信号はレーダ装置等の信号処理器
から出力される同一空間座標のコヒーレントビデオであ
る。１は前記入力信号の時間的変動を１次式もしくは２
次式で近似する第１演算器である。２は第１演算器で求
めた近似式に従う推定不要信号を生成する第２演算器で
ある。３は前記入力信号から対応する時間位置の前記推
定不要信号を引算する引算器であり、その出力信号とし
て前記入力信号から不要信号成分を抑圧したものが得ら
れる。FIG. 1 shows an embodiment of the unnecessary signal suppressing apparatus according to the present invention. The input signal is a coherent video of the same spatial coordinates output from a signal processor such as a radar device. 1 is a linear equation or 2
This is a first computing unit that is approximated by the following equation. Reference numeral 2 denotes a second computing unit that generates an estimation unnecessary signal according to the approximate expression obtained by the first computing unit. Reference numeral 3 denotes a subtracter for subtracting the unnecessary estimation signal at a corresponding time position from the input signal, and an output signal of which is obtained by suppressing an unnecessary signal component from the input signal.
【００１６】その機能を説明する。入力信号は従来の不
要信号抑圧装置の説明で述べた信号群（表１の縦列の信
号群）である。第１演算器１は前記入力信号の時間的変
動を最小二乗法などで１次式もしくは２次式で近似する
が、これは下記の一般式における係数（Ａ、Ｂ、Ｃ）を
求めることに相当する。The function will be described. The input signal is a signal group (the signal group in the column in Table 1) described in the description of the conventional unnecessary signal suppressing device. The first computing unit 1 approximates a temporal variation of the input signal by a linear equation or a quadratic equation by a least square method or the like, which is used to calculate coefficients (A, B, C) in the following general equation. Equivalent to.
【００１７】[0017]
【数１】 (Equation 1)
【００１８】次いで、第２演算器２は式（１）のｍに整
数値を入れて、各入力信号の時間位置に対応する推定不
要信号を得る。最後に、引算器３は第１演算器１に入力
した各入力信号に対応する推定不要信号を引算して、最
初の入力信号に含まれる１次式もしくは２次式で近似さ
れる信号成分を除去した出力信号を得る。Next, the second arithmetic unit 2 obtains an unnecessary estimation signal corresponding to the time position of each input signal by inputting an integer value to m in the equation (1). Lastly, the subtracter 3 subtracts the estimation unnecessary signal corresponding to each input signal input to the first calculator 1 to obtain a signal approximated by a linear expression or a quadratic expression included in the first input signal. An output signal from which components have been removed is obtained.
【００１９】なお、第１演算器１は入力信号の変動成分
を１次式もしくは２次式で近似するとしたが、両方の機
能を持たせて必要に応じて切り替えるものでもよく、そ
のいずれかに制限するものではない。また、不要信号が
特定の周波数を持つ場合は、その周波数成分を直流にす
る周波数変換器を第１演算器１の前に入れる必要がある
が、本発明はその有無を問わない。Although the first arithmetic unit 1 approximates the fluctuation component of the input signal by a linear expression or a quadratic expression, it may have both functions and switch as needed. There is no restriction. Further, when the unnecessary signal has a specific frequency, a frequency converter for converting the frequency component to DC needs to be inserted before the first computing unit 1, but the present invention does not matter whether or not it is present.
【００２０】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 is obvious to those skilled in the art that the present invention is not limited to the embodiments and various modifications and changes can be made within the scope of the claims. There will be.
【００２１】[0021]
【発明の効果】以上説明したように、本発明に係る不要
信号抑圧装置によれば、レーダ装置等の同一空間座標の
コヒーレントビデオに含まれる不要信号について、直流
成分も含めて観測時間内の変動が１周期以下の信号成分
を効果的に抑圧できる。As described above, according to the unnecessary signal suppressing apparatus according to the present invention, the fluctuation of the unnecessary signal included in the coherent video of the same spatial coordinate such as the radar apparatus within the observation time including the DC component is obtained. Can effectively suppress signal components of one cycle or less.
【図１】本発明に係る不要信号抑圧装置の実施の形態を
示すブロック図である。FIG. 1 is a block diagram showing an embodiment of an unnecessary signal suppressing apparatus according to the present invention.
【図２】従来の不要信号抑圧装置を示すブロック図であ
る。FIG. 2 is a block diagram showing a conventional unnecessary signal suppressing device.
１ 第１演算器 ２ 第２演算器 ３，１３ 引算器 １１ 平均値算出器 １２ 推定不要信号生成器 DESCRIPTION OF SYMBOLS 1 1st arithmetic unit 2 2nd arithmetic unit 3, 13 Subtractor 11 Average value calculator 12 Estimation unnecessary signal generator
Claims (1)
力信号とし、前記入力信号の時間的変動を１次式もしく
は２次式で近似する第１の演算器と、該第１の演算器で
求めた近似式に従う推定不要信号を生成する第２の演算
器と、前記入力信号から対応する時間位置の前記推定不
要信号を引算する引算器とを備え、前記入力信号に含ま
れる不要信号成分を抑圧することを特徴とする不要信号
抑圧装置。1. A first arithmetic unit which takes coherent video of the same spatial coordinates as an input signal and approximates a temporal variation of the input signal by a linear expression or a quadratic expression, and a first arithmetic unit. A second computing unit that generates an unnecessary estimation signal according to an approximate expression; and a subtractor that subtracts the unnecessary estimation signal at a corresponding time position from the input signal, wherein an unnecessary signal component included in the input signal is calculated. An unnecessary signal suppressing device characterized by suppressing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10319858A JP2000131420A (en) | 1998-10-26 | 1998-10-26 | Unwanted signal suppressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10319858A JP2000131420A (en) | 1998-10-26 | 1998-10-26 | Unwanted signal suppressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000131420A true JP2000131420A (en) | 2000-05-12 |
Family
ID=18115029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10319858A Pending JP2000131420A (en) | 1998-10-26 | 1998-10-26 | Unwanted signal suppressor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000131420A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016010109A1 (en) * | 2014-07-16 | 2016-01-21 | 株式会社デンソー | Target detection device and target detection method for detecting target using radar waves |
-
1998
- 1998-10-26 JP JP10319858A patent/JP2000131420A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016010109A1 (en) * | 2014-07-16 | 2016-01-21 | 株式会社デンソー | Target detection device and target detection method for detecting target using radar waves |
| JP2016023945A (en) * | 2014-07-16 | 2016-02-08 | 株式会社デンソー | Target detector |
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