Receiving coherent processing method of pulse passive bistatic radar

Abstract

The invention discloses a receiving coherent processing method of a pulse passive bistatic radar, and relates to the technical field of passive radars. According to the receiving coherent processing method of the pulse passive bistatic radar, a non-coherent radar radiating source is taken as a non-cooperative irradiation source, frequency synchronization and phase synchronization are achieved by using technologies of frequency synchronic tracking, independent local oscillation frequency sources and digital phase correction, and thus coherent processing performance of detection of a moving target is obtained. Firstly, a direct wave sample signal is sent to a frequency synchronic tracking sub-system to conduct frequency measurement and local oscillation tracking, a local oscillation frequency code is output to the independent local oscillation frequency source, and a corresponding first local oscillation and a corresponding second local oscillation which are taken as a mixed frequency local oscillation of secondary down-conversion of a direct wave and a target channel are generated to achieve the frequency synchronization; and then intermediate frequency direct sampling of an intermediate direct wave signal and an echo signal is conducted, then digital phase discrimination of the sampled signals is conducted on the sampled signals, a reference phase of a current direct wave pulse is stored, the reference phase is used for one by one phase correction of the subsequent target echo of the target channel, and thus the phase synchronization is achieved.

Description

1. Technical field [0001] The invention belongs to the technical field of passive radar, and in particular relates to a receiving coherent processing technology which uses a non-coherent radar radiation source as a non-cooperative irradiation source and can obtain coherent processing performance for moving target detection. 2. Background technology [0002] Pulsed passive bistatic radars use a passive receiver to locate targets using direct waves and target scatter signals from non-cooperating radar emitters. The receiver itself does not transmit a signal when locating a target, so the receiver's own position is not revealed. This ability to locate targets while remaining undetected using signals from third-party, non-cooperative radar emitters has distinct advantages in hostile environments. [0003] In recent years, research on non-cooperative bistatic radar systems at home and abroad has made some progress in core technologies such as positioning principles, system synch...

AI Technical Summary

Problems solved by technology

However, how to use the direct wave of the pulse system to correlate with the target signal to achieve coherent processing performance has always been a difficult research point.

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