Moving target detection method of airborne external radiation source radar

Abstract

The invention belongs to the technical field of radars and discloses a moving target detection method of an airborne external radiation source radar. The method comprises the following steps: signals received by an airborne external radiation source radar are obtained; two echo signals are subjected to fitting filtering and phase compensation according to a reference signal, and two echo signals subjected to phase compensation are obtained; the two echo signals subjected to phase compensation are subjected to channel registration, and one of the two echo signals subjected to channel registration is deducted from the other, so that an echo signal subjected to clutter suppression is obtained; the echo signal subjected to clutter suppression is then subjected to Doppler migration correction, and a target echo signal subjected to Doppler migration correction is obtained; and the target echo signal subjected to Doppler migration correction is then subjected to distance migration correction, so that a target echo signal subjected to distance migration correction is obtained. The method solves the problem in the prior art that the target detection performance is poor when target migration is not compensated.

Description

technical field [0001] The invention relates to the technical field of radar, in particular to a moving target detection method of an airborne external radiation source radar, which can realize the detection of weak targets on the ground by the external radiation source radar under an airborne moving platform, and obtain good detection results. Background technique [0002] In order to detect distant weak targets, the external radiation source radar usually adopts the method of increasing the coherent accumulation time to obtain a higher accumulation gain. At this time, the time delay and Doppler frequency of the maneuvering target are no longer fixed, but change with the accumulation time, that is, there are range migration and Doppler migration, and the target spans multiple units, causing the target energy to disperse and accumulate The decrease of gain is not conducive to target detection, and the study of coherent accumulation target migration compensation method has be...

AI Technical Summary

Problems solved by technology

The keystone algorithm and fractional Fourier transform are applied to the clutter-suppressed data to compensate for the migration of moving targets. At this time, the target energy is concentrated and the signal-to-noise ratio is improved, which is beneficial to target detection and solves the problem of uncompensated target migration in the prior art. The problem of poor target detection performance

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