JPH0220177U

JPH0220177U -

Info

Publication number: JPH0220177U
Application number: JP9931488U
Authority: JP
Priority date: 1988-07-26
Filing date: 1988-07-26
Publication date: 1990-02-09

Description

[Brief explanation of the drawing]

第１図は本考案のレーダ装置の一実施例の構成
図、第２図ａは第１図の実施例におけるパルス伸
長部１５の第一のフイルタの周波数対遅延時間特
性図、第２図ｂは第１図の実施例におけるパルス
圧縮部１７の第二のフイルタの周波数対遅延時間
特性図、第２図Ｃは第１図の実施例のパルス圧縮
部１７によるパルス圧縮信号の波形図である。１１……アンテナ部、１２……送受切替部、１
３……受信部、１４……送信増幅部、１５……パ
ルス伸張部、１６……周波数発生部、１７……パ
ルス圧縮部、１８……レベル検出回路、１９……
タイミング発生回路、２０……クロツク発生回路
、２１……制御回路、２２……ラツチ回路。 Fig. 1 is a block diagram of an embodiment of the radar device of the present invention, Fig. 2a is a frequency versus delay time characteristic diagram of the first filter of the pulse expansion section 15 in the embodiment of Fig. 1, and Fig. 2b is 1 is a frequency vs. delay time characteristic diagram of the second filter of the pulse compression section 17 in the embodiment of FIG. 1, and FIG. 2C is a waveform diagram of the pulse compression signal by the pulse compression section 17 of the embodiment of FIG. 1. . 11... Antenna section, 12... Transmission/reception switching section, 1
3... Receiving section, 14... Transmission amplification section, 15... Pulse expansion section, 16... Frequency generation section, 17... Pulse compression section, 18... Level detection circuit, 19...
Timing generation circuit, 20...Clock generation circuit, 21...Control circuit, 22...Latch circuit.

Claims

[Scope of Claim for Utility Model Registration] In a radar device mounted on a flying object platform such as an aircraft or an artificial satellite and operated as a synthetic aperture radar, an antenna section that emits a transmitted signal to the ground and receives the reflected signal; a frequency generating section that generates a transmission frequency; a pulse stretching section that converts the transmission frequency into pulses and performs linear frequency modulation using a first filter having a predetermined frequency versus delay time characteristic to perform pulse expansion and generate a transmission pulse; , a transmission amplification section that amplifies the transmission pulse to a predetermined level and outputs it as a transmission signal; a transmission/reception switching section that supplies the transmission signal to the antenna section and switches and outputs the output signal of the antenna section; a receiving section that performs receiving processing including amplification and frequency conversion on the output signal of the antenna section and outputs the resultant signal as a received signal; and a second filter that transmits the received signal to a second filter whose frequency versus delay time characteristic is opposite to that of the first filter. a pulse compression section that performs pulse compression through the pulse compression section; a level detection circuit that detects the level of the pulse-compressed received signal and outputs a level detection signal; and a level detection circuit that detects the level of the pulse-compressed received signal and outputs a level detection signal; a control circuit that outputs a control signal to distinguish whether the received signal is a received signal or an undesired reflected signal; and a timing signal for starting and ending output of a level detection signal for the received signal based on the level detection signal and the control signal. a latch circuit that generates a clock signal, a timing generation circuit that generates a timing signal for starting and ending reception in the receiving section based on the timing signal, and a clock generator that generates a clock signal based on the output signal of the frequency generating section. A radar device comprising a circuit.