Distance-speed synchronous pull-off deception jamming recognition algorithm based on gradient projection

Abstract

The invention discloses a distance-speed synchronous pull-off deception jamming recognition algorithm based on gradient projection, and belongs to the field of radar anti-jamming. According to a PD radar, the radar is generally jammed through distance-speed synchronous pull-off jamming, the deception jamming can conduct pull-off jamming on distance information and speed information at the same time, and thus the difficulty for accurately choosing and tracking a target of the PD radar is increased. The method comprises the following steps that (1) signals received by the radar are sampled, and a complete atom library is established according to the time-variant characteristic of a distance-speed synchronous jamming echo; (2) when the AGC voltages and the target number of a receiver are suddenly changed, it is judged that the target is jammed; (3) the Doppler frequency of the target is obtained through a gradient projection method, then the target speed is figured out, and accordingly anti-jamming is performed according to the target speed. The distance-speed synchronous pull-off deception jamming recognition algorithm based on gradient projection is high in jamming recognition capability, easy in engineering realization, high in engineering application value and large in popularization prospect.

Description

1. Technical field [0001] The invention belongs to the field of radar anti-jamming, and is applicable to the identification of distance-velocity synchronous towing deception jamming by high / medium pulse repetition frequency radars (such as airborne pulse Doppler radars, etc.). 2. Background technology [0002] With the improvement of digital technology and signal processing capability, deceptive jamming technology has been developed rapidly. Due to the strong correlation with the target and the difficulty of anti-jamming, deceitful jamming poses an increasingly serious threat to radar, making it increasingly difficult for traditional radar anti-jamming methods to meet the combat requirements in complex electromagnetic environments, seriously affecting the ability of radar to target Detect and track performance. At present, the identification algorithms of radar deception jamming at home and abroad are mostly for a single type of jamming, which has certain limitations. -Spe...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to propose a distance-velocity synchronous towing deception interference identification method based on gradient projection, which solves the problem that the existing spectrum analysis method based on Radon-Wigner transform is affected by the cross term and the target velocity estimation accuracy is not good under short-term conditions. high problem

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