Whitening filtering-based anti-interference method for frequency-agile radar

Abstract

The invention discloses a whitening filtering-based anti-interference method for a frequency-agile radar. The implementation process of the method includes the following steps that: echo signals containing a target object to be detected, main lobe interference and noises are received; mixed baseband echo vectors are arranged so as to form a baseband echo matrix; the covariance matrix of the baseband echo matrix is calculated, and generalized eigenvalue decomposition is performed on the covariance matrix; an eigenvalue threshold is set according to a maximum eigenvalue; all eigenvalues larger than the eigenvalue threshold and eigenvectors corresponding to the eigenvalues are selected so as to form a whitening matrix; the whitening matrix is multiplied by the baseband echo matrix, so that whitening filtering can be performed; and the one-dimensional range image of a target is obtained by means of fast Fourier transform (FFT). With the method of the invention adopted, the energy of densefalse target interference can be suppressed with the echo energy of a target retained. The method can be used for improving the target detection probability of a radar.

Description

technical field [0001] The invention belongs to the technical field of radar, and further relates to a frequency-agile radar anti-jamming method based on whitening filtering in the technical field of radar signal processing. The present invention can suppress the interference of dense false targets and detect the target of the frequency-agile radar. When the radar echo is mixed with the interference signal, the target energy is completely covered by the interference energy. By whitening and filtering the radar echo data, the purpose of suppressing interference can be achieved. . Background technique [0002] In the modern radar electronic battlefield, various methods such as suppressive jamming and towed deception jamming have seriously affected the radar seeker's ability to detect and guide targets, and many anti-jamming methods have emerged as the times require, and are widely used in the design of radar signal processing systems , electronic reconnaissance and electronic...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that in the process of perceiving the interference environment, it relies heavily on the selection of the interference window. When the window is not selected properly, the interference cannot be effectively suppressed.

The disadvantage of this method is that while performing polarization cancellation to suppress interference, part of the energy of the target echo signal will be lost, resulting in a decrease in the probability of target detection

Images