JPH08271615A - Target detection device - Google Patents

Target detection device

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Publication number
JPH08271615A
JPH08271615A JP7097774A JP9777495A JPH08271615A JP H08271615 A JPH08271615 A JP H08271615A JP 7097774 A JP7097774 A JP 7097774A JP 9777495 A JP9777495 A JP 9777495A JP H08271615 A JPH08271615 A JP H08271615A
Authority
JP
Japan
Prior art keywords
target
distance
hough
detection
azimuth
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.)
Granted
Application number
JP7097774A
Other languages
Japanese (ja)
Other versions
JP2611686B2 (en
Inventor
Seiji Nomoto
誠二 野本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
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Filing date
Publication date
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Priority to JP7097774A priority Critical patent/JP2611686B2/en
Publication of JPH08271615A publication Critical patent/JPH08271615A/en
Application granted granted Critical
Publication of JP2611686B2 publication Critical patent/JP2611686B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE: To obtain a target detection device, for a radar apparatus, whose detection capability with reference to a low-S/N-ratio target is enhanced without increasing the number of wrong targets. CONSTITUTION: A threshold detector 101 detects a target so as to be controlled in such a way that the number of wrong targets becomes within a definite value. In addition, a low-threshold detector 102 detects a target at a threshold value which is lower than that of the threshold detector 101. Hough transformation devices 105, 108 and segment extractors 107, 110 extract a segment corresponding to a target based on the Hough transformation to a corresponding line from points with reference to data on an orthogonal coordinate plane by a distance to the detection time and by an azimuth angle to the detection time, a target is extracted, and a wrong target which is generated at random is removed sufficiently. When the target which is obtained as a result and the target of the threshold detector 101 are composed, and a low-S/N-ratio target can be detected without increasing the number of wrong targets.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は目標検出装置に関し、特
に水平方向にビーム走査を行うことにより移動航空機を
対象とする目標の距離と方位角とを得るレーダ装置の目
標検出装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a target detecting apparatus, and more particularly to a target detecting apparatus for a radar apparatus which obtains a target distance and an azimuth angle for a mobile aircraft by scanning a beam in a horizontal direction.

【0002】[0002]

【従来の技術】従来のこの種の目標検出装置は、レーダ
装置で連続的に受信された受信信号の強度を、設定した
スレッショルド値と比較し、これを超える受信信号のみ
を目標信号として検出する。さらに、論文“Search Rad
er Detection and Track Withthe Hough Transform ”
(IEEE Transaction on Aerospace Electronics Syetems
Vol.30,No.1 January 1994)ではハフ(Hough)変換を用
いた目標検出手法が述べられている。この論文で述べら
れている技術を適用した従来の構成を図3に示し、その
動作を説明する。
2. Description of the Related Art A conventional target detection apparatus of this type compares the intensity of a received signal continuously received by a radar apparatus with a set threshold value and detects only a received signal exceeding the threshold value as a target signal. . In addition, the paper “Search Rad
er Detection and Track Withthe Hough Transform ”
(IEEE Transaction on Aerospace Electronics Syetems
Vol. 30, No. 1 January 1994) describes a target detection method using Hough transform. FIG. 3 shows a conventional configuration to which the technique described in this paper is applied, and its operation will be described.

【0003】レーダ受信信号を入力とするスレッショル
ド検出器101 は、スレッショルド値Th を超えた受信信
号を目標信号として検出する。検出した目標に対して距
離計算器103 において距離を計算し、これら検出目標ご
との複数の計算距離はハフ変換器105Aに供給される。
[0003] Threshold detector 101 which receives the radar reception signal, detects the reception signal exceeding the threshold value T h as the target signal. The distance calculator 103 calculates the distance to the detected target, and the plurality of calculated distances for each detected target are supplied to the Hough transformer 105A.

【0004】ハフ変換器105Aでは、検出時刻(X軸)対
距離(Y軸)で表現される直交座標平面上の各距離デー
タに対してハフ変換を施し、これら距離データを時間に
対する距離の変化率a(X軸)と、時刻0における距離
b(Y軸)で表現される直交座標平面上の線分に変換す
る公知の座標変換を行い、この変換結果をメモリ106Aに
格納する。
The Hough transformer 105A performs a Hough transform on each distance data on a rectangular coordinate plane expressed by a detection time (X axis) versus a distance (Y axis), and converts these distance data into a change in distance with respect to time. A well-known coordinate conversion for converting into a line segment on a rectangular coordinate plane expressed by a ratio a (X axis) and a distance b (Y axis) at time 0 is performed, and the conversion result is stored in the memory 106A.

【0005】線分抽出器107Aは、ハフ変換器105Aによる
変換結果からランダム性を持たず検出時刻対距離の平面
上では直線上の点として検出される目標のみ抽出する。
なおハフ変換については、さらに後述して詳細に説明す
る。
The line segment extractor 107A extracts only targets which have no randomness and are detected as points on a straight line on the plane of detection time versus distance from the conversion result of the Hough transformer 105A.
The Hough transform will be described later in detail.

【0006】航跡処理器113 においては、目標と過去の
航跡との相関判定を行い、相関があると判定されると航
跡としてメモリ114Aに記録する。ここで、航跡とは、検
出された目標のうち、特に過去に検出された目標との相
関がとれ、同一の目標が連続的に検出されたと判定され
たものをいう。
[0006] The track processor 113 determines the correlation between the target and the past track, and when it is determined that there is a correlation, records the track in the memory 114A as the track. Here, the wake refers to, among the detected targets, a correlate with a target particularly detected in the past, and it is determined that the same target is continuously detected.

【0007】表示器115 は、目標を画面上の対応する距
離と方位角で指定される位置に表示する。誤目標数制御
器116 は、検出された目標の総数と航跡の総数との差か
ら誤目標数を求め、その数が予め定めた数値の範囲内と
なるようにスレッショルド値Th を制御する。
[0007] The display 115 displays a target at a position specified by a corresponding distance and azimuth on the screen. Target speed controller 116 erroneously determines the target number false from the difference between the total number of the total number and track of the detected target, controls the threshold value T h to be within a range of numbers that number is predetermined.

【0008】[0008]

【発明が解決しようとする課題】この従来の目標検出装
置は、誤目標数がある数値内となるようにスレッショル
ド値を制御するとともに、検出時刻対距離の座標平面上
でハフ変換による線分抽出を行うことにより低S/Nの
目標を検出しているが、方位角情報は利用していないの
で十分に誤目標を除去することができず、従って低S/
N目標の検出が不完全となることが避けられないという
問題点があった。
This conventional target detection apparatus controls a threshold value so that the number of erroneous targets falls within a certain numerical value, and extracts a line segment by Hough transform on a coordinate plane of detection time versus distance. , A low S / N target is detected. However, since the azimuth information is not used, an erroneous target cannot be sufficiently removed, and accordingly, the low S / N
There was a problem that incomplete detection of N targets was unavoidable.

【0009】本発明の目的は上述した問題点を解決し、
方位角情報を利用して十分に誤目標を除去し、低S/N
目標の検出不完全を著しく抑圧しうる目標検出装置を提
供することにある。
The object of the present invention is to solve the above-mentioned problems,
Uses azimuth information to sufficiently eliminate false targets, and low S / N
An object of the present invention is to provide a target detection device capable of remarkably suppressing imperfect detection of a target.

【0010】[0010]

【課題を解決するための手段】本発明は、上述した目的
を達成するために次の手段構成を有する。即ち、目標検
出装置に関する本発明の第1の構成は、水平方向にビー
ム走査を行って捕捉した航空機を対象とする目標の距離
と方位角とを得るレーダ装置の目標検出装置であって、
目標検出における誤目標数がある数値内に入るように目
標検出におけるスレッショルド値Th を制御する誤目標
数制御手段と、前記Th を超えるレーダ受信信号を目標
として検出する第1のスレッショルド検出手段と、前記
h よりも低いスレッショルド値で目標を検出する第2
のスレッショルド検出手段と、前記第2のスレッショル
ド検出手段で検出した目標の距離および方位角を計算す
る距離方位角計算手段と、前記距離方位角計算手段で計
算した目標の距離とその検出時刻に関するデータに点を
線に対応させる座標変換としてのハフ変換を行って検出
時刻対距離の直交座標平面上で線分を形成するデータ列
を真の目標のデータ列として抽出する距離情報ハフ変換
手段と、前記距離方位角計算手段で計算した目標の方位
角とその検出時刻に関するデータにハフ変換を行って検
出時刻対方位角の直交座標平面上で線分を形成するデー
タ列を真の目標のデータ列として抽出する方位角情報ハ
フ変換手段と、前記距離情報ハフ変換手段と方位角情報
ハフ変換手段の抽出結果を比較してこれら抽出結果のい
ずれによってもそれぞれの直交座標面上で線分を形成す
るものとして抽出されたデータ列を提供する目標データ
を前記第2のスレッショルド検出手段で検出された目標
として判定し出力する相関処理を行う相関手段と、前記
第1のスレッショルド検出手段の出力と前記相関手段の
出力とを加算して目標の総数とする合成処理を行う合成
処理手段と、前記合成処理手段で得られる目標の総数に
基づいて目標の航跡を発生し航跡数を誤目標数制御に必
要なデータとして前記誤目標数制御手段に供給する航跡
処理手段とを備えた構成を有する。
The present invention has the following means constitution in order to achieve the above-mentioned object. That is, a first configuration of the present invention relating to a target detection device is a target detection device of a radar device that obtains a distance and an azimuth of a target for an aircraft captured by performing beam scanning in a horizontal direction,
The first threshold detector for detecting a target speed control unit erroneously for controlling the threshold value T h in the target detection to be within values in the target number of erroneous in target detection, the radar reception signal exceeding the T h as the target When a second to detect the target with a lower threshold value than the T h
Threshold detecting means, distance azimuth calculating means for calculating the distance and azimuth of the target detected by the second threshold detecting means, and data concerning the target distance calculated by the distance azimuth calculating means and its detection time. A distance information Hough transforming means for performing a Hough transform as a coordinate transform for making a point correspond to a line and extracting a data string forming a line segment on the orthogonal coordinate plane of the detection time vs. distance as a true target data string, A true target data string is a data string that forms a line segment on the orthogonal coordinate plane of the detection time vs. azimuth by Hough transforming the data regarding the target azimuth and the detection time calculated by the distance azimuth calculation means. The azimuth angle information Hough transforming means to be extracted as, and the distance information Hough transforming means and the azimuth angle information Hough transforming means are compared with each other. Correlation means for performing correlation processing for determining target data that provides a data string extracted as forming a line segment on each orthogonal coordinate plane as a target detected by the second threshold detection means, and outputting the target data. , A combination processing unit for performing a combination process of adding the output of the first threshold detection unit and the output of the correlation unit to obtain a total number of targets, and a target of the target based on the total number of targets obtained by the combination processing unit. And a track processing means for generating a track and supplying the number of tracks to the false target number control means as data necessary for controlling the false target number.

【0011】本発明の第2の構成は、前記第1の構成に
おいて、前記距離情報ハフ変換手段および方位角情報ハ
フ変換手段が、真の目標の検出を前記ハフ変換で点から
線に対応して変換された線が共有する交点をカウントし
た累積度が所定の一定値を超えることの検出に基づいて
判定する手段を備えた構成を有する。
According to a second configuration of the present invention, in the first configuration, the distance information Hough transform means and the azimuth angle information Hough transform means correspond to a line from a point to a line by the Hough transform. A means for determining based on the detection that the cumulative degree of counting the intersections shared by the converted lines exceeds a predetermined constant value.

【0012】本発明の第3の構成は、前記第1または第
2の構成において、前記距離情報ハフ変換手段および方
位角情報ハフ変換手段がそれぞれ少なくとも1つの評価
単位時間内での目標の速度がほぼ一定と見做し得る前記
評価単位時間を設定した構成を有する。
According to a third configuration of the present invention, in the first or second configuration, the distance information Hough conversion means and the azimuth angle information Hough conversion means each include a target speed within at least one evaluation unit time. It has a configuration in which the evaluation unit time that can be regarded as substantially constant is set.

【0013】[0013]

【作用】以下、本発明の作用を説明する。目標検出にお
ける誤目標数が所定の数値内に納まるように目標検出に
おけるスレッショルド値を制御しつつ設定し、検出した
目標の距離対検出時刻によって表現される直交座標上の
点をハフ変換によって線に対応させる変換を行い、この
変換結果から前述した直交座標面上では線として表現さ
れる真の目標を把握して真の目標値の航跡数を求め、ス
レッショルド値を超える検出数とこの航跡数との差の誤
目標数として目標を検出する従来の目標検出装置では、
距離情報は利用しているものの方位角情報は利用してい
ないので雑音成分を十分に排除した誤目標の十分な除去
が得られず、このため低いS/Nでの目標の検出が不十
分であった。
The function of the present invention will be described below. Set while controlling the threshold value in target detection so that the number of false targets in target detection falls within a predetermined numerical value, and the points on the Cartesian coordinates expressed by the detected target distance vs. detection time are converted into lines by Hough transformation. Corresponding conversion is performed, the true target expressed as a line on the above-mentioned orthogonal coordinate plane is grasped from this conversion result, and the number of tracks of the true target value is obtained. In the conventional target detection device that detects the target as the false target number of the difference of
Since the distance information is used but the azimuth angle information is not used, it is not possible to sufficiently remove the erroneous target in which the noise component has been sufficiently eliminated, and therefore the target detection at a low S / N is insufficient. there were.

【0014】本発明では、方位角情報を対象とするハフ
変換も距離情報を対象とするハフ変換とともに取り入
れ、検出時刻対距離および方位角の直交座標面上の計測
点をハフ変換によって点から対応する線に変換し、これ
ら2つの変換線に基づいてノイズ等による誤目標数を効
率よく除去し、より低S/Nの目標信号を正確に検出す
ることを可能としている。
In the present invention, the Hough transform for azimuth information is also incorporated together with the Hough transform for distance information, and measurement points on a rectangular coordinate plane of detection time versus distance and azimuth are corresponded to points by Hough transform. Then, based on these two conversion lines, the number of erroneous targets due to noise or the like is efficiently removed, and a lower S / N target signal can be accurately detected.

【0015】[0015]

【実施例】次に、本発明の実施例について図面を参照し
て説明する。図1は、本発明の一実施例の構成を示すブ
ロック図である。図1に示す実施例は、目標検出処理に
おける誤目標数がある数値内となるように、スレッショ
ルド値Th を制御する誤目標数制御器116 と、スレッシ
ョルド値Th を超えるレーダ受信信号を目標として検出
するスレッショルド検出器101 と、スレッショルド検出
器101 よりも低いスレッショルド値で目標を検出する低
スレッショルド検出器102 と、検出された目標の距離を
計算する距離計算器103 と、検出された目標の方位角を
計算する方位角計算器104 と、検出時刻と距離のデータ
をハフ変換するハフ変換器(1)105と、その結果を記録す
るメモリ(1)106と、ハフ変換の結果より検出時刻対距離
座標平面上においては線分となるデータを抽出する線分
抽出器(1)107と、検出時刻と方位角のデータをハフ変換
するハフ変換器(2)108と、その結果を記録するメモリ
(2)109と、ハフ変換の結果より検出時刻対方位角座標平
面上において線分となるデータを抽出する線分抽出器
(2)110と、線分抽出器(1)107と線分抽出器(2)110の両方
で検出された目標データを抽出する相関処理器111 と、
相関処理器111 から出力される目標とスレッショルド検
出器101 から出力される目標とを合成する合成処理器11
2 と、図3の従来例と同じ航跡処理器113,表示器115 お
よびメモリ114A対応のメモリ(3)114とを備える。
Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. The embodiment shown in FIG. 1, the target so that within values in the target number of erroneous at the target detection process, the target speed controller 116 erroneously controlling the threshold value T h, the radar reception signal exceeding the threshold value T h A threshold detector 101 for detecting a target, a low threshold detector 102 for detecting a target with a threshold value lower than the threshold detector 101, a distance calculator 103 for calculating a distance of the detected target, and a An azimuth calculator 104 for calculating an azimuth angle, a Hough converter (1) 105 for Hough transform of detection time and distance data, a memory (1) 106 for recording the result, and a detection time based on the Hough transform result. A line segment extractor (1) 107 for extracting data to be a line segment on the distance coordinate plane, a Hough transformer (2) 108 for Hough transforming detection time and azimuth data, and recording the result. memory
(2) 109, a line segment extractor for extracting data that becomes a line segment on the azimuth coordinate plane with respect to the detection time from the result of the Hough transform
(2) 110, a correlation processor 111 that extracts target data detected by both the line segment extractor (1) 107 and the line segment extractor (2) 110,
A synthesis processor 11 for synthesizing a target output from the correlation processor 111 and a target output from the threshold detector 101
2 and the same track processor 113, display 115, and memory (3) 114 corresponding to the memory 114A as in the conventional example of FIG.

【0016】これら構成要素中、誤目標数制御器116 が
誤目標数制御手段を、スレッショルド検出器101 が第1
のスレッショルド検出手段を、低スレッショルド検出器
102が第2のスレッショルド検出手段を、距離計算器103
と方位角計算器104 とが距離方位角計算手段を、ハフ
変換器(1)105とメモリ(1)106と線分抽出器(1)107とが距
離情報ハフ変換手段を、ハフ変換器(2)108とメモリ(2)1
09と線分抽出器(2)110とが方位角情報ハフ変換手段を、
相関処理器111 が相関処理手段を、合成処理器112 が合
成処理手段を、航跡処理器113 とメモリ(3)114と表示器
115 とが航跡処理手段をそれぞれ構成する。
Among these components, the wrong target number controller 116 is the wrong target number control means, and the threshold detector 101 is the first target number controller.
Threshold detection means, a low threshold detector
102 is second threshold detection means, distance calculator 103
, An azimuth calculator 104, a distance azimuth calculator, a Hough transformer (1) 105, a memory (1) 106, and a line segment extractor (1) 107, a distance information Hough converter, and a Hough converter ( 2) 108 and memory (2) 1
09 and the line segment extractor (2) 110 provide azimuth angle information Hough conversion means,
The correlation processor 111 is a correlation processor, the synthesis processor 112 is a synthesis processor, a wake processor 113, a memory (3) 114, and a display.
115 constitute wake processing means.

【0017】次に、本実施例の動作について説明する。
レーダ受信信号は2つの系に分岐し、その1つはスレッ
ショルド検出器101 に入力され、スレッショルド値Th
を超えた場合に目標として検出される。誤目標数制御器
116 は、航跡処理器113 より入力される航跡数とスレッ
ショルド検出器101 において検出した目標数とによりそ
の差の誤目標数を算定し、この誤目標数の値が常に一定
の範囲内に入るようにスレッショルド値Th を制御す
る。
Next, the operation of this embodiment will be described.
The radar reception signal is branched into two systems, one of which is input to a threshold detector 101, and a threshold value Th
If it exceeds, it will be detected as a target. False target number controller
116 calculates the erroneous target number of the difference between the number of wakes input from the wake processor 113 and the target number detected by the threshold detector 101 so that the value of this erroneous target number is always within a certain range. to control the threshold value T h to.

【0018】一方、分岐したもう1つのレーダ受信信号
は低スレッショルド検出器102 に入力される。低スレッ
ショルド検出器102 は、スレッショルド検出器101 のス
レッショルド値Th よりも常に低い値となるように制御
されることより、S/Nが低い目標信号も検出する。こ
こで検出された目標は、距離計算器103 と方位角計算器
104 とに供給され、それぞれ距離と方位角とが算出され
る。
On the other hand, another branched radar reception signal is input to the low threshold detector 102. The low threshold detector 102 is controlled so as to always have a value lower than the threshold value T h of the threshold detector 101, thereby detecting a target signal having a low S / N. The target detected here is the distance calculator 103 and the azimuth calculator
And the distance and azimuth are calculated respectively.

【0019】次に、目標データはまた2系統に分岐さ
れ、それぞれハフ変換器(1)105とハフ変換器(2)108とに
入力される。ハフ変換器(1)105とメモリ(1)106と線分抽
出器(1)107とは、検出時刻対距離座標平面上で線分とな
る目標データを抽出する。これは、目標である航空機の
速度が少なくとも評価単位時間ごとにほぼ一定と見做せ
るため、目標データが検出時刻対距離の座標平面上では
直線上の点として検出されるに対し、ノイズ等による誤
目標はランダムに検出されるためである。このような線
分抽出により誤目標を除去し、航空機による目標データ
のみ抽出できることとなる。
Next, the target data is further divided into two systems and input to the Hough converter (1) 105 and the Hough converter (2) 108, respectively. The Hough transformer (1) 105, the memory (1) 106, and the line segment extractor (1) 107 extract target data that forms a line segment on the detection time versus distance coordinate plane. This is because the speed of the target aircraft can be considered to be substantially constant at least every evaluation unit time, so that the target data is detected as a point on a straight line on the coordinate plane of the detection time versus the distance, but noise or the like causes This is because wrong targets are detected at random. By such line segment extraction, the erroneous target can be removed and only the target data of the aircraft can be extracted.

【0020】ハフ変換による動作を図2を用いて説明す
る。ハフ変換は、前述した如く点を線に対応させる一種
の座標変換であり、次の式で表現することができる。 点Pi (Ti ,Ri )→線Si ここで、点Pi は図2の(a)に示す如く検出時刻Tと
距離Rを直交軸とする平面上の点であり、線Si は図2
の(b)に示す如く、b=−Ti ・a+Ri で表される
a,bを直交軸とする(a,b)平面上の線である。こ
こでaは時間に対する距離の変化率、bは時刻0におけ
る距離を意味する。
The operation based on the Hough transform will be described with reference to FIG. The Hough transform is a kind of coordinate transform in which points correspond to lines as described above, and can be expressed by the following equation. Point P i (T i , R i ) → Line S i Here, the point P i is a point on a plane having the detection time T and the distance R as orthogonal axes as shown in FIG. i is Figure 2
As shown in (b) of the above, it is a line on the (a, b) plane with a and b represented by b = −T i · a + R i as orthogonal axes. Here, a indicates the rate of change of the distance with respect to time, and b indicates the distance at time 0.

【0021】図2の(a)で、P1 〜P5 は、真の目標
であるため直線上に配列しており、P6 〜P9 はノイズ
等による誤目標であるためランダムに分布している。こ
れをハフ変換すると図2の(b)に示すように、S1
5 は点Qを交点として共有して交わっているので、こ
の交点Qを検出することにより所望の線分を抽出するこ
とができる。この動作をハフ変換器(1)105のハフ変換で
行い、(a,b)平面上のデータをメモリ(1)106に記憶
し、線分抽出器(1)107にて交点の累積度数をカウント
し、この累積度数が一定値以上となることを検出して目
標を検出する。
In FIG. 2A, since P 1 to P 5 are true targets, they are arranged on a straight line, and P 6 to P 9 are randomly distributed because they are false targets due to noise or the like. ing. When this is the Hough transform, as shown in (b) of FIG. 2, S 1 ~
Since S 5 is intersect share point Q as an intersection, it is possible to extract the desired segment by detecting the intersection Q. This operation is performed by the Hough transform of the Hough transformer (1) 105, the data on the (a, b) plane is stored in the memory (1) 106, and the cumulative frequency of the intersection is calculated by the line segment extractor (1) 107. The counting is performed, and the target is detected by detecting that the cumulative frequency is equal to or more than a predetermined value.

【0022】以上のハフ変換の動作を、ハフ変換器(2)1
08とメモリ(2)109と線分抽出器(2)110 からなるもう1
つの系統においても検出時刻対方位角の直交座標平面上
で実施し、同様にして目標をハフ変換により抽出する。
線分抽出器(1)107と線分抽出器(2)110の出力とを相関処
理器111 により比較することにより、距離と方位角のデ
ータから、実際の空間を一定速度で移動する真の目標を
低S/N状態で検出する。
The above-mentioned Hough transform operation is performed by the Hough transformer (2) 1
Another one consisting of 08, memory (2) 109 and line segment extractor (2) 110
The processing is also performed on the orthogonal coordinate plane of the detection time versus the azimuth angle in the two systems, and the target is similarly extracted by the Hough transform.
By comparing the output of the line segment extractor (1) 107 and the output of the line segment extractor (2) 110 with the correlation processor 111, it is possible to obtain a true velocity that moves at a constant speed in the actual space from the data of the distance and the azimuth angle. Detect target in low S / N state.

【0023】さらに、相関処理器111 から出力される目
標とスレッショルド検出器101 から出力される目標に対
して合成処理器112 において、和をとることにより最終
的に検出される目標とする。航跡処理器113 とメモリ
(3)114とは、図3に示す従来技術と同様に、検出された
目標から航跡を発生され航跡数を誤目標数制御器116 へ
出力する。また表示器115 は目標信号を画面上の対応す
る距離と方位角の位置に表示する。こうして、低スレッ
ショルド検出器102 で検出される目標も正確に把握する
ことにより、従来よりも低S/Nの目標信号の検出も可
能とすることができる。
Further, the target output from the correlation processor 111 and the target output from the threshold detector 101 are summed up by the synthesizing processor 112 to obtain the target finally detected. Wake processor 113 and memory
(3) 114 is the same as in the prior art shown in FIG. 3 and outputs a track number from the detected target to the erroneous target number controller 116. The display 115 displays the target signal at the corresponding distance and azimuth position on the screen. In this way, by accurately grasping the target detected by the low threshold detector 102, it is possible to detect a target signal having a lower S / N than before.

【0024】[0024]

【発明の効果】以上説明したように本発明は、従来の目
標検出装置が検出時刻対距離の直交座標平面におけるハ
フ変換利用の線分検出にのみ着目していたのに対し、ハ
フ変換による線分抽出を従来の検出時刻対距離と検出時
刻対方位角の2つの座標平面上で行うことにより、ノイ
ズ等によりランダムに発生する誤目標数を効率よく除去
し得て、従来の目標検出装置に比べて、より低S/Nで
の目標信号の正確な検出が可能になるという効果を有す
る。
As described above, according to the present invention, the conventional target detection apparatus focuses only on the detection of the line segment using the Hough transform in the rectangular coordinate plane of the detection time versus the distance. By performing minute extraction on the conventional two coordinate planes of detection time versus distance and detection time versus azimuth, the number of erroneous targets randomly generated due to noise or the like can be efficiently removed. Compared with this, there is an effect that the target signal can be accurately detected at a lower S / N.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例の目標検出装置の構成を示す
ブロック図である。
FIG. 1 is a block diagram illustrating a configuration of a target detection device according to an embodiment of the present invention.

【図2】ハフ変換による線分抽出の原理図である。FIG. 2 is a principle diagram of line segment extraction by Hough transform.

【図3】従来の目標検出装置の構成を示すブロック図で
ある。
FIG. 3 is a block diagram showing a configuration of a conventional target detection device.

【符号の説明】[Explanation of symbols]

101 スレッショルド検出器 102 低スレッショルド検出器 103 距離計算器 104 方位角計算器 105 ハフ変換器(1) 106 メモリ(1) 107 線分抽出器(1) 108 ハフ変換器(2) 109 メモリ(2) 110 線分抽出器(2) 111 相関処理器 112 合成処理器 113 航跡処理器 114 メモリ(3) 115 表示器 116 誤目標数制御器 101 Threshold detector 102 Low threshold detector 103 Distance calculator 104 Azimuth calculator 105 Hough converter (1) 106 Memory (1) 107 Line segment extractor (1) 108 Huff converter (2) 109 Memory (2) 110 Line extractor (2) 111 Correlation processor 112 Synthesis processor 113 Track processor 114 Memory (3) 115 Display 116 False target number controller

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 水平方向にビーム走査を行って捕捉した
航空機を対象とする目標の距離と方位角とを得るレーダ
装置の目標検出装置であって、目標検出における誤目標
数がある数値内に入るように目標検出におけるスレッシ
ョルド値Thを制御する誤目標数制御手段と、前記Th
を超えるレーダ受信信号を目標として検出する第1のス
レッショルド検出手段と、前記Th よりも低いスレッシ
ョルド値で目標を検出する第2のスレッショルド検出手
段と、前記第2のスレッショルド検出手段で検出した目
標の距離および方位角を計算する距離方位角計算手段
と、前記距離方位角計算手段で計算した目標の距離とそ
の検出時刻に関するデータに点を線に対応させる座標変
換としてのハフ変換を行って検出時刻対距離の直交座標
平面上で線分を形成するデータ列を真の目標のデータ列
として抽出する距離情報ハフ変換手段と、前記距離方位
角計算手段で計算した目標の方位角とその検出時刻に関
するデータにハフ変換を行って検出時刻対方位角の直交
座標平面上で線分を形成するデータ列を真の目標のデー
タ列として抽出する方位角情報ハフ変換手段と、前記距
離情報ハフ変換手段と方位角情報ハフ変換手段の抽出結
果を比較してこれら抽出結果のいずれによってもそれぞ
れの直交座標面上で線分を形成するものとして抽出され
たデータ列を提供する目標データを前記第2のスレッシ
ョルド検出手段で検出された目標として判定し出力する
相関処理を行う相関手段と、前記第1のスレッショルド
検出手段の出力と前記相関手段の出力とを加算して目標
の総数とする合成処理を行う合成処理手段と、前記合成
処理手段で得られる目標の総数に基づいて目標の航跡を
発生し航跡数を誤目標数制御に必要なデータとして前記
誤目標数制御手段に供給する航跡処理手段とを備えるこ
とを特徴とする目標検出装置。
1. A target detection apparatus for a radar apparatus for obtaining a target distance and an azimuth angle for an aircraft captured by performing beam scanning in a horizontal direction, wherein the number of erroneous targets in target detection is within a numerical value. a target speed control unit erroneously for controlling the threshold value T h in the target detection to enter the T h
A first threshold detector for detecting a radar reception signal as a target of more than a second threshold detection means for detecting the target at a lower threshold value than the T h, the target detected by the second threshold detector Distance and azimuth calculating means for calculating the distance and azimuth of the target, and performing Hough transform as coordinate transformation for associating a point with a line on the data relating to the target distance and its detection time calculated by the distance and azimuth calculating means. Distance information Hough transforming means for extracting a data sequence forming a line segment on a time-distance orthogonal coordinate plane as a true target data sequence; a target azimuth calculated by the distance azimuth calculating means; A data sequence that forms a line segment on a rectangular coordinate plane of detection time versus azimuth angle by performing a Hough transform on data related to the data is extracted as a true target data sequence. The extraction results of the position information Hough transforming means, the distance information Hough transforming means, and the azimuth angle information Hough transforming means are compared, and any of these extraction results is extracted as forming a line segment on each orthogonal coordinate plane. Correlating means for performing correlating processing for determining and outputting target data that provides the generated data string as the target detected by the second threshold detecting means, and output of the first threshold detecting means and output of the correlating means. And a combination processing means for performing a combination processing to obtain the total number of targets, and a track of the target is generated based on the total number of targets obtained by the combination processing means, and the number of tracks is set as data necessary for erroneous target number control. A target detection apparatus comprising: a wake processing unit that supplies the erroneous target number control unit.
【請求項2】 前記距離情報ハフ変換手段および方位角
情報ハフ変換手段が、真の目標の検出を前記ハフ変換で
点から線に対応して変換された線が共有する交点をカウ
ントした累積度が所定の一定値を超えることの検出に基
づいて判定する手段を備えることを特徴とする請求項1
記載の目標検出装置。
2. A cumulative degree in which the distance information Hough transform means and the azimuth angle information Hough transform means count intersections shared by lines converted from points to lines in the Hough transform for true target detection. 2. A device according to claim 1, further comprising means for judging based on the detection that the value exceeds a predetermined value.
The target detection device described.
【請求項3】 前記距離情報ハフ変換手段および方位角
情報ハフ変換手段がそれぞれ少なくとも1つの評価単位
時間内での目標の速度がほぼ一定と見做し得る前記評価
単位時間を設定したものであることを特徴とする請求項
1または請求項2記載の目標検出装置。
3. The distance information Hough conversion means and the azimuth angle Hough conversion means each set the evaluation unit time at which a target speed within at least one evaluation unit time can be regarded as substantially constant. The target detecting device according to claim 1 or 2, wherein
JP7097774A 1995-03-30 1995-03-30 Target detection device Expired - Lifetime JP2611686B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7097774A JP2611686B2 (en) 1995-03-30 1995-03-30 Target detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7097774A JP2611686B2 (en) 1995-03-30 1995-03-30 Target detection device

Publications (2)

Publication Number Publication Date
JPH08271615A true JPH08271615A (en) 1996-10-18
JP2611686B2 JP2611686B2 (en) 1997-05-21

Family

ID=14201196

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005331392A (en) * 2004-05-20 2005-12-02 Nec Corp Method and device for detecting target
CN101887116A (en) * 2010-04-14 2010-11-17 电子科技大学 Improved method for detecting random Hough transformation of weak target
JP2014119381A (en) * 2012-12-18 2014-06-30 Mitsubishi Electric Corp Radar device
JP2016151469A (en) * 2015-02-17 2016-08-22 三菱電機株式会社 Signal processing device
JP2019045245A (en) * 2017-08-31 2019-03-22 日本電気株式会社 Target speed estimating device, radar device, target speed estimation method, and program
CN109541579A (en) * 2018-12-28 2019-03-29 中南大学 Doppler's through-wall radar localization method of Hough transformation based on Bezier model

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005331392A (en) * 2004-05-20 2005-12-02 Nec Corp Method and device for detecting target
CN101887116A (en) * 2010-04-14 2010-11-17 电子科技大学 Improved method for detecting random Hough transformation of weak target
JP2014119381A (en) * 2012-12-18 2014-06-30 Mitsubishi Electric Corp Radar device
JP2016151469A (en) * 2015-02-17 2016-08-22 三菱電機株式会社 Signal processing device
JP2019045245A (en) * 2017-08-31 2019-03-22 日本電気株式会社 Target speed estimating device, radar device, target speed estimation method, and program
CN109541579A (en) * 2018-12-28 2019-03-29 中南大学 Doppler's through-wall radar localization method of Hough transformation based on Bezier model
CN109541579B (en) * 2018-12-28 2022-12-27 中南大学 Bezier model-based Hough transform Doppler through-wall radar positioning method

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