Jamming subspace reconstruction-based radar multi-false target jamming suppression method

Abstract

The invention belongs to the radar multi-false target jamming suppression technique field and relates to a jamming subspace reconstruction-based radar multi-false target jamming suppression method. The jamming subspace reconstruction-based radar multi-false target jamming suppression method comprises the following steps that: a covariance matrix R<k> of echo signals r <k> is calculated according to the echo signals r<k> which are received by a radar in a k-th coherent processing interval; a jamming subspace P<J><k> of the k-th coherent processing interval is obtained according to Q largest eigenvalues of the R<k>, wherein Q is the number of jammers in a radar observation region; jamming signal suppression is performed on the rk through using the P<J><k>, so that post-jamming suppression signals X<k> of the radar in the k-th coherent processing interval can be obtained; the variable quantity Delta f0j, k> of the Doppler frequency of a j-th jammer in a k+1-th coherent processing interval and the k-th coherent processing interval is estimated; a jamming subspace P<J><k+1> of the k+1-th coherent processing interval can be reconstructed through utilizing the P<J><k> and the Delta f0j, k; and jamming signal suppression is performed on echo signals r <k+1> of the radar in the k+1-th coherent processing interval, so that post-jamming suppression signals X<k+1> of the radar in the k+1-th coherent processing interval can be obtained.

Description

Technical field [0001] The invention belongs to the technical field of radar multi-false target interference suppression, and in particular relates to a radar multi-false target interference suppression method based on interference subspace reconstruction. The present invention can be used to suppress radar multi-false target interference under the condition of jammer motion, saving the radar system in The computing resources when countering active multi-false target interference, and improving the speed of signal processing. Background technique [0002] Radar jamming suppression technology plays a pivotal role in modern electronic warfare. Among them, the multi-false target interference appears in the radar signal processing terminal as a number of false targets similar to the radar target, and has similar characteristics to the real target in the air, time, and frequency domains, which seriously restricts the detection and tracking performance of the radar. It becomes a probl...

AI Technical Summary

Problems solved by technology

However, for multi-false target interference, it usually appears in the form of main lobe interference. The interference signal enters from the main lobe of the radar antenna, and the airspace information is basically the same as that of the target. It is difficult to achieve a better suppression effect by using the airspace processing method, but it has the same Doppler information of different targets can be suppressed from the frequency domain

[0004] Since the estimation and eigenvalue decomposition of the covariance matrix are involved in the operation of the subspace method, in the actual environment, the target and the jammer are usually moving, and the echo data and its covariance matrix change with time, so it is necessary to calculate the covariance matrix and the interference subspace are constantly estimated and updated, and the system has a large amount of calculation

Images