JPH075246A - Radar device - Google Patents

Abstract

PURPOSE:To observe echoes from a target while skillfully suppressing the reflection from sea surface in all directions regardless of wavy sea surface by automatically changing the gain control value of sensitivity time control (STC) based on wind direction and speed. CONSTITUTION:The direction of radar beams is detected by a beam direction detection means 9 and is input to an STC control circuit 10. The control circuit 10 controls an STC circuit 8 considering the wind direction and speed for the direction of transmission and reception of radar beams and then automatically changes the gain control value properly. Namely, when the radar beams are directed toward the upstream of wind and wind speed is fast, sea surface reflection strength is maximized. As the wind speed becomes slower or angle deviates from the upstream direction of wind, the reflection strength is weakened. The control circuit 10 automatically changes the gain control value of the STC circuit 8 according to each status of wind direction and speed. Thus, even if the condition of sea surface differs depending on the direction, echoes from a target are captured while skillfully suppressing the sea surface reflection in all directions.

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ＳＴＣ（Sensitivity Ti
me Control）を備えたレーダ装置に関する。The present invention relates to STC (Sensitivity Ti
me control).

【０００２】[0002]

【従来の技術】図２は、従来のこの種のレーダ装置の構
成の概略を示す図で、図において、１はレーダアンテ
ナ、２はアンテナ回転機構、３は受信回路、４は中間周
波増幅回路、５は検波回路、６は映像信号増幅回路、７
はブラウン管、８はＳＴＣ回路である。2. Description of the Related Art FIG. 2 is a schematic view of the configuration of a conventional radar apparatus of this type. In the figure, 1 is a radar antenna, 2 is an antenna rotating mechanism, 3 is a receiving circuit, and 4 is an intermediate frequency amplifying circuit. 5, a detection circuit, 6 a video signal amplification circuit, 7
Is a cathode ray tube, and 8 is an STC circuit.

【０００３】次に動作について説明する。レーダアンテ
ナ１で受信した反射エコーは受信回路３で中間周波数に
変換され、中間周波増幅回路４で増幅されて検波回路５
に入り、検波回路５で検波されてから映像信号増幅回路
６で増幅され、レーダ指示機のブラウン管７に入力され
て表示される。また、反射エコーの強度は距離の４乗に
逆比例するので、近距離からの強い信号に対しては、一
般的にその感度を抑制する必要があり、物標からの反射
エコーが見えにくいときにはＳＴＣ回路８を動作させ、
中間周波増幅回路４の増幅度を近距離反射抑制用のカー
ブ信号を用いて制御し、近距離からの反射エコーを抑え
る動作を行う。Next, the operation will be described. The reflection echo received by the radar antenna 1 is converted into an intermediate frequency by the receiving circuit 3, amplified by the intermediate frequency amplifying circuit 4, and then detected by the detecting circuit 5.
Then, the signal is detected by the detection circuit 5, amplified by the video signal amplification circuit 6, input to the cathode ray tube 7 of the radar indicator, and displayed. Moreover, since the intensity of the reflected echo is inversely proportional to the fourth power of the distance, it is generally necessary to suppress the sensitivity for a strong signal from a short distance, and when the reflected echo from the target is difficult to see. Operate the STC circuit 8,
The amplification degree of the intermediate frequency amplifier circuit 4 is controlled by using a curve signal for suppressing short-distance reflection, and an operation of suppressing a reflection echo from a short distance is performed.

【０００４】[0004]

【発明が解決しようとする課題】従来のＳＴＣを備えた
レーダ装置は以上のように構成され動作するので、海上
レーダとして用いる場合に問題が生じる。すなわち、風
の影響で海面が波立っている場合、波の形状から一般的
に風上方向へ進行する電磁波の海面反射強度は大きくな
り、風下方向へ進行する電磁波の海面反射強度は小さく
なる。然しながら従来のＳＴＣは距離に応じて一律な利
得制御を行うため、風上方向での海面反射を抑制するよ
うなＳＴＣの調整を行うと、風下方向では海面反射だけ
でなく物標からのエコーまで消えてしまい、反対に風下
方向での海面反射を抑制するようなＳＴＣの調整を行う
と、風上方向では海面反射を抑制できないという問題点
があった。Since the conventional radar device provided with the STC is constructed and operates as described above, a problem arises when it is used as a marine radar. That is, when the sea surface is wavy due to the influence of the wind, the sea surface reflection strength of the electromagnetic wave traveling in the upwind direction generally becomes large due to the shape of the wave, and the sea surface reflection strength of the electromagnetic wave traveling in the downwind direction becomes small. However, the conventional STC performs uniform gain control according to the distance, so if you adjust the STC so as to suppress the sea surface reflection in the windward direction, not only the sea surface reflection but also the echo from the target will be obtained in the leeward direction. However, if the STC is adjusted so that the sea surface reflection in the leeward direction is suppressed, the sea surface reflection in the leeward direction cannot be suppressed.

【０００５】本発明はかかる問題点を解決するためにな
されたものであり、波立つ海面上でもＳＴＣで全方向で
の海面反射を上手に抑制しながら物標からのエコーを観
測できるレーダ装置を得ることを目的としている。The present invention has been made in order to solve the above problems, and provides a radar device capable of observing echoes from a target while suppressing the sea surface reflection in all directions by the STC even on a rugged sea surface. The purpose is to get.

【０００６】[0006]

【課題を解決するための手段】本発明に係わるレーダ装
置は、装置周囲の風向および風速を検出する手段と、Ｓ
ＴＣの利得制御値を適宜可変する手段とを備え、レーダ
ビームが現在送受信されている方向と風向との関係、お
よび風速とに基づき、ＳＴＣの利得制御値を自動的に変
化させながら受信信号を増幅することとした。A radar device according to the present invention comprises means for detecting the wind direction and wind speed around the device, and S
And a means for varying the gain control value of the TC as appropriate, and the received signal is automatically changed while automatically changing the gain control value of the STC based on the relationship between the wind direction and the direction in which the radar beam is currently transmitted and received. It was decided to amplify.

【０００７】[0007]

【実施例】以下、本発明の実施例を図面を用いて説明す
る。図１は本発明の一実施例を示すブロック図であり、
図において、１はレーダアンテナ、２はアンテナ回転機
構、３は受信回路、４は中間周波増幅回路、５は検波回
路、６は映像信号増幅回路、７はブラウン管、８はＳＴ
Ｃ回路、９はレーダビーム方向検出手段、１０はＳＴＣ
制御回路である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.
In the figure, 1 is a radar antenna, 2 is an antenna rotating mechanism, 3 is a receiving circuit, 4 is an intermediate frequency amplification circuit, 5 is a detection circuit, 6 is a video signal amplification circuit, 7 is a cathode ray tube, and 8 is ST.
C circuit, 9 is radar beam direction detecting means, 10 is STC
It is a control circuit.

【０００８】次に動作について説明する。レーダアンテ
ナ１で受信した反射エコーは受信回路３で中間周波数に
変換され、中間周波数増幅回路４で増幅されて検波回路
５に入り、検波回路５で検波されてから映像信号増幅回
路６で増幅され、レーダ指示機のブラウン管７に入力さ
れて表示される。また、近距離からの強い信号に対して
は、ＳＴＣ回路８を動作させて利得制御を行うが、本実
施例の装置では、レーダビームの送受信方向がビーム方
向検出手段９で検出されて情報としてＳＴＣ制御回路１
０に入力され、さらに装置周囲の風向，風速も情報とし
てＳＴＣ制御回路１０に入力されており、ＳＴＣ制御回
路１０でレーダビームの送受信方向に対する風向および
風速を考慮してＳＴＣ回路８を制御し、自動的にＳＴＣ
回路８の利得制御値を適宜変更している。Next, the operation will be described. The reflected echo received by the radar antenna 1 is converted into an intermediate frequency by the receiving circuit 3, amplified by the intermediate frequency amplifying circuit 4, enters the detecting circuit 5, detected by the detecting circuit 5, and then amplified by the video signal amplifying circuit 6. , Is input to and displayed on the cathode ray tube 7 of the radar indicator. Further, for a strong signal from a short distance, the STC circuit 8 is operated to perform gain control. In the device of this embodiment, the transmission / reception direction of the radar beam is detected by the beam direction detection means 9 and is used as information. STC control circuit 1
0, and the wind direction and wind speed around the device are also input as information to the STC control circuit 10. The STC control circuit 10 controls the STC circuit 8 in consideration of the wind direction and the wind speed with respect to the transmission / reception direction of the radar beam, STC automatically
The gain control value of the circuit 8 is appropriately changed.

【０００９】すなわち、例えばレーダビームの送受信方
向が真っすぐ風上方向にあり、且つ風速が速い場合には
電磁波の海面反射強度が最大になるが、風速が遅くなる
につれ、あるいは風上方向から角度がずれるにつれ、反
射強度は除々に弱まり、レーダビームの送受信方向が真
っすぐ風下方向になり、風が殆どない状態のときは電磁
波の海面反射強度が最小になる。本発明の装置ではこの
ような風向，風速の個々の状況に応じて、ＳＴＣ制御回
路１０がＳＴＣ回路８の利得制御値を自動的に変更し、
海面の状況が方向により相違しても全方向での海面反射
を上手に抑制しながら物標からのエコーを捕らえる装置
としている。That is, for example, when the transmitting / receiving direction of the radar beam is straight upwind and the wind speed is fast, the sea surface reflection intensity of the electromagnetic wave becomes maximum, but as the wind speed slows, or the angle from the windward direction increases. As it shifts, the reflection intensity gradually weakens, the transmitting and receiving direction of the radar beam becomes straight downwind, and the sea surface reflection intensity of electromagnetic waves becomes the minimum when there is almost no wind. In the device of the present invention, the STC control circuit 10 automatically changes the gain control value of the STC circuit 8 in accordance with such individual conditions of wind direction and wind speed,
Even if the condition of the sea surface varies depending on the direction, the device is designed to capture the echo from the target while suppressing the sea surface reflection in all directions.

【００１０】特に船舶等に搭載されるレーダ装置は、風
の影響による海面反射強度の相違が著しく、全方向のエ
コーを良好な状態で観測することが難しいが、本発明の
装置では容易に観測できるようになる。なお、船舶等に
搭載する場合、ＳＴＣ制御回路１０に入力する風向およ
び風速情報は、当該船舶の移動方向および移動速度によ
る影響を除去した、真の風向および風速情報を入力す
る。Particularly in a radar device mounted on a ship or the like, it is difficult to observe echoes in all directions in good condition because the difference in sea surface reflection intensity due to the influence of wind is remarkable, but it is easy to observe with the device of the present invention. become able to. When installed on a ship or the like, the wind direction and wind speed information input to the STC control circuit 10 is true wind direction and wind speed information without the influence of the moving direction and moving speed of the ship.

【００１１】[0011]

【発明の効果】本発明のレーダ装置は以上説明したよう
に、レーダビームが送受信される方向の風向，風速に応
じてＳＴＣの利得制御値を自動的に変更させることがで
きるので、海面の波立ちにより風上，風下で海面反射の
状況が相違する等の場合でも、海面の状況に応じたＳＴ
Ｃを行うことができ、全方向で常に物標からのエコーを
良好な状態で観測できるという効果がある。As described above, the radar device of the present invention can automatically change the gain control value of the STC according to the wind direction and the wind speed in the direction in which the radar beam is transmitted and received, so that the sea surface wave Even if the condition of the sea surface reflection differs depending on the windward and leeward conditions, the ST can be adjusted according to the condition of the sea surface.
C can be performed, and there is an effect that the echo from the target can always be observed in a good state in all directions.

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

【図１】本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of the present invention.

【図２】従来の装置の構成の概略を示すブロック図であ
る。FIG. 2 is a block diagram showing a schematic configuration of a conventional device.

【符号の説明】 １ レーダアンテナ ２ アンテナ回転機構 ３ 受信回路 ４ 中間周波増幅回路 ５ 検波回路 ６ 映像信号増幅回路 ７ ブラウン管 ８ ＳＴＣ回路 ９ レーダビーム方向検出手段 １０ ＳＴＣ制御回路[Explanation of Codes] 1 radar antenna 2 antenna rotation mechanism 3 receiving circuit 4 intermediate frequency amplifying circuit 5 detection circuit 6 video signal amplifying circuit 7 cathode ray tube 8 STC circuit 9 radar beam direction detecting means 10 STC control circuit

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 ＳＴＣ（Sensitivity Time Control) で
利得制御を行うレーダ装置において、 装置周囲の風向および風速を検出する手段と、 ＳＴＣの利得制御値を適宜可変する手段と、 これらの手段を用いてレーダビームが現在送受信されて
いる方向と風向との関係、および（または）風速との関
係により、ＳＴＣの利得制御値を自動的に可変させる手
段とを備えたことを特徴とするレーダ装置。1. In a radar device for performing gain control by STC (Sensitivity Time Control), means for detecting the wind direction and wind speed around the device, means for appropriately changing the gain control value of the STC, and these means are used. A radar device comprising: means for automatically varying the gain control value of the STC in accordance with the relationship between the direction in which the radar beam is currently transmitted and received and the wind direction, and / or the relationship with the wind speed.