A radar target detection method based on the radiation source of communication satellite

Abstract

The invention discloses a radar target detection method based on a communication satellite radiation source. The method comprises the steps of determining a radar, wherein a scene on which the radar is located comprises a communication satellite, and the communication satellite radiates an electromagnetic wave signal to the radar so as to respectively obtain a direct wave signal and a target echo signal and respectively obtain a direct wave digital signal and a target echo digital signal; respectively obtaining N direct wave digital signal sections and N' target echo digital signal sections; sequentially carrying out direct wave interference cancellation processing and delay-Doppler migration calibration on the N' target echo digital signal sections to obtain N' target echo digital signal sections subjected to delay-Doppler migration calibration, and to further obtain a coherent accumulating delay-Doppler cross-correlation three-dimensional diagram; carrying out constant false alarm detection on the coherent accumulating delay-Doppler cross-correlation three-dimensional diagram to obtaining R' targets and further obtain doppler frequency shift information corresponding to the R' targets and delay information corresponding to the R' targets.

Description

Technical field [0001] The invention relates to the field of radar technology, in particular to a radar target detection method based on a communication satellite radiation source. Background technique [0002] At home and abroad, there is little research on external radiation source radar based on communication satellite radiation source, and few people have proposed a complete target detection method. [0003] The signal-to-noise ratio of the echo signal reflected by the satellite signal after irradiating the target is low. It is necessary to coherently accumulate multiple echo signals to improve the signal-to-noise ratio. However, the target echo signal is weak and requires more coherent accumulation times. During this time, the target is always in motion, and its distance or speed is always changing, that is, there is distance walking (or called "delayed walking") or speed walking (or called "Doppler walking" ) Phenomenon; when the target is detected after coherent accumulatio...

AI Technical Summary

Problems solved by technology

[0003] The signal-to-noise ratio of the reflected echo signal after the satellite signal is irradiated to the target is low, and multiple echo signals need to be coherently accumulated to improve the signal-to-noise ratio, but the target echo signal is weak, and more times of coherent accumulation are required. During this period, the target has been moving, and its distance or speed has been changing, that is, there is distance walking (or called "delay walking") or speed walking (or called "Doppler walking") ) phenomenon; when the target is detected after coherent accumulation, only the range of the target distance or speed can be obtained, and a single value cannot be obtained; when the walking phenomenon is serious, no information may even be obtained

[0004] In order to solve the problem of distance / speed (delay / Doppler) walking, methods such as Hough transform and keystone transform have been proposed at home and abroad. However, most of the current research is carried out for active detection radar, especially for linear frequency modulation signals. As the active detection radar of the detection signal, the active detection radar and the external radiation source radar have great differences in application scenarios and mathematical models. The method suitable for active detection radar may not be applicable to the external radiation source radar. need to revisit

Images