Broadband coherent radar target simulator

Abstract

A broadband coherent radar target simulator is composed of a receiving end, a transmitting end, a power divider, a lower mixer, an upper mixer, an instantaneous measurement receiver, a DSP processor, an interference modulator, a PC, a target echo delay compensation, a frequency modulation step frequency local oscillator and a high resolution radar signal simulation module. A shipborne radar transmits an X-wave band frequency modulation step frequency signal, a radar simulator receives the signal via a horn antenna, and the frequency modulation step frequency local oscillator generates a local oscillator signal; an intermediate frequency signal is generated after the dechirp processing of the lower mixer and is divided into two signals by the power divider, with one signal sent to the instantaneous measurement receiver to complete the measurements of radar carrier frequency signal, radar pulse repetition period, pulse width and pulse amplitude parameter, and with the other one sent to the high resolution radar signal simulation module to complete the simulation of a high resolution one dimensional object range image; the target echo delay compensation is used to solve the increase RMS attenuation problem of a dechirp time delay, and the compensated intermediate frequency signal is sent to the interference modulator. The broadband coherent radar target simulator of the invention is scientific in conception, less in use device number and low in cost.

Description

technical field [0001] The invention relates to a wideband coherent radar target simulator (abbreviated as a radar simulator), which belongs to the technical field of wideband radar target signal simulation verification. test. Background technique [0002] With instantaneous ultra-bandwidth radar, because of its high range resolution, strong anti-interference ability, excellent target detection and recognition ability, etc., it has been widely valued by countries all over the world. For example, the ground-based imaging radar (GBR) deployed by the United States has a center frequency of The x-band, instantaneous bandwidth is 1GHz, the detectable distance is 4000Km, and the distance resolution is 15cm; the x-band active shipborne radar APAR jointly developed by Germany, Canada and the Netherlands (Wen Shuliang, Yuan Qi, Qin Zhongyu. Broadband phased array Design criteria and development direction of radar [J]. Systems Engineering and Electronic Technology, 2010, 27(6): 1007-...

AI Technical Summary

Problems solved by technology

Modern Radar, 2008, 30(8): 31-32), however, the bandwidth of modern broadband radar reaches 1 GHz or more, and the high-resolution radar simulator developed by Liu Yi, Wang Chao and others cannot meet the ultra-bandwidth requirements. In addition, the radar signal Stretch processing It will bring errors to the imaging and need to be compensated

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