Radar anti-interference method by utilizing polarization cancellation

Abstract

The invention relates to the field of radar signal processing and especially relates to a radar anti-interference method by utilizing polarization cancellation. In the method, through determining a cancellation main channel and an accessory channel, and then, by utilizing the main channel and the accessory channel as well as channel weight coefficients thereof, no-interference signals are obtained after cancellation. The method is especially suitable for escort self-defense noise interference and general clutter interference; signal-to-clutter-noise ratio of the system can be greatly improved, detection of follow-up radar signal processing is convenient, and detection capability of the radar can be effectively improved under the complex electromagnetic environment.

Description

technical field [0001] The invention relates to the field of radar signal processing, in particular to a radar anti-jamming method using polarization cancellation. Background technique [0002] Noise suppressing jamming is a commonly used jamming method, which floods the target echo with high-power noise, making it impossible for the radar to detect the target. The main ways to combat noise-suppressive interference include the use of large-time-width signals with high duty ratios (high average power), coherent accumulation, burn-through operating modes, etc., as well as adaptive sidelobe cancellation technology, narrow-band filtering, etc. filtering method. Large time-width signals, coherent accumulation, burn-through mode, etc. all belong to the anti-jamming method of "striving energy". Since the radar echo is two-way propagation, and the interference signal is one-way propagation, the anti-jamming method of "striving energy" is more efficient Low. For blocking or aiming...

AI Technical Summary

Problems solved by technology

Large time-width signals, coherent accumulation, burn-through mode, etc. all belong to the anti-jamming method of "striving energy". Since radar echoes are two-way propagation, and interference signals are one-way propagation, the efficiency of "striving energy" anti-jamming methods is relatively Low

For blocking or aiming noise suppression interference, the frequency domain filtering method is often difficult to work

And when the adaptive side lobe cancellation technology encounters self-defense or team-based interference, the main lobe will be severely distorted after cancellation, and the target signal in the main array will be greatly canceled, resulting in false alarms.

Images