Velocity-deception-jamming-resistant phase encoding method for cognitive radar

Abstract

The invention discloses a velocity-deception-jamming-resistant phase encoding method for a cognitive radar, belongs to the technical field of radar jamming resistance, and particularly relates to a radar jamming-resistant waveform design technology. According to the method, relevant parameters of a target and jamming are extracted from prior information acquired by the cognitive radar, a stop band is arranged close to each real target Doppler according to a real target Doppler estimated value, a stop band is arranged at the same position as a constant-mode encoding sequence configured in advanced, and an optimal pulse-to-pulse phase encoding transmission waveform is designed according to the criterion that the spectrum energy of a coded signal in the stop band, thereby effectively inhibiting velocity deception jamming in a multi-target and multi-jamming scene, increasing the signal-to-jamming ratio of each real target, and realizing the effect of correct detection of a plurality of real targets.

Description

technical field [0001] The invention belongs to the technical field of radar anti-jamming, in particular to radar anti-jamming waveform design technology. Background technique [0002] With the emergence of modern deceptive jamming technology based on digital radio frequency memory (DRFM), radar jamming technology has entered the era of coherent jamming. After the jammer intercepts the radar signal, it copies it and modulates the Doppler parameters of the signal, and then forwards the jamming signal back to the radar receiver to form speed deception jamming. This type of interference will affect the radar's detection of the real target Doppler, causing the radar velocity gate to lose lock, interfering with the normal detection of the target by the radar, and also greatly consuming radar resources. Therefore, in order to ensure the correct detection and tracking of radar targets in the jamming environment, it is of great theoretical value and practical significance to improv...

AI Technical Summary

Problems solved by technology

This method can effectively suppress strong interference in a single real target scene, but for a multi-target multi-jamming scene, the anti-jamming performance of this method is seriously degraded, and some real targets may not be detected correctly by radar

Judging from the currently published literature, there is no research on the anti-velocity deception jamming waveform design for multi-target scenarios.

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