Main lobe deception jamming inhibition method based on frequency diversity MIMO radar

Abstract

The invention discloses a main lobe deception jamming inhibition method based on frequency diversity MIMO radar, and mainly solves the problem that main lobe deception jamming can be inhibited only in an angle dimension in the prior art. The method of the invention includes the following steps of: 1, calculating echo data of an MIMO radar receiving array, and performing matched filtering on the echo data and obtaining data of distance units to be detected; 2, calculating a noise covariance matrix, and constructing a whitening rotary matrix according to the matrix and transmitting and receiving oriented vectors; 3, performing whitening rotation on the data of the distance units to be detected, and obtaining whitening rotary vectors; 4, constructing a signal subspace and a jamming subspace according to the whitening rotary matrix; 5, performing dualism hypothesis, and calculating a generalized likelihood ratio function value and a detection threshold according to the dualism hypothesis, the signal subspace, the jamming subspace and the whitening rotary vectors; and 6, comparing the generalized likelihood ratio function value with the detection threshold, and obtaining a detection result. The main lobe deception jamming inhibition method based on the frequency diversity MIMO radar can effectively inhibit the main lobe deception jamming and be used for target detection and tracking.

Description

technical field [0001] The invention relates to the field of radar technology, in particular to a method for suppressing main lobe deceptive interference, which can be used in a frequency diversity MIMO radar system to effectively suppress deceptive interference signals entering from the main lobe of a MIMO radar antenna, and improve frequency diversity MIMO Target detection performance of radar under mainlobe deceptive jamming. Background technique [0002] Main lobe deceptive jamming is a common radar jamming pattern. The purpose of deception is to mislead information such as the echo amplitude and phase received by the radar by modulating or retransmitting the received radar transmission signal. At present, electronic deception technology focuses on deceiving the victim radar in the two-dimensional information of azimuth and distance, or creating many false targets around the real target echo, so that the real target cannot be detected. The main lobe deceptive jamming wi...

AI Technical Summary

Problems solved by technology

The frequency agility method will lead to a decrease in the signal-to-interference ratio and an increase in the sidelobe; the digital radio frequency memory quantization error technology is limited by the quantization level. When the quantization level is high, the performance loss of the technology is greater

Therefore, the data-level single-station anti-jamming method cannot fully exert its anti-jamming ability, and cannot make full use of the advantages of radar

Although the ordinary MIMO radar can overcome the shortcomings of the data-level single-station anti-jamming method, it can only suppress the main lobe deceptive jamming in the angle or distance dimension.

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