Polarization cancellation method against oppressive towed jamming of pulse Doppler radar

Abstract

The invention provides a polarization anti-jamming method for a pulse Doppler radar, in order to suppress the oppressive towed jamming. Signals are simultaneously received by setting primary and secondary antennas whose polarization modes are orthogonal to each other, polarization cancellation weight coefficients of the three channel signals of the sum, azimuth difference and pitch difference of the primary antenna are determined by using the polarization characteristic differences of both, when the jamming energy is strong, the polarization cancellation weight coefficients can be adaptively estimated without knowing a jamming polarization vector and actual receiving gains of the primary antenna, then the pulse Doppler radar can obtain non-jamming signals after the polarization cancellation, and the continuous angle tracking of a real target is realized. The method of the invention is applied to the pulse Doppler radar, can effectively suppress the oppressive towed jamming, and enhancethe detection and tracking performance of the radar.

Description

technical field [0001] The invention relates to the technical field of pulse Doppler radar anti-jamming, in particular to a polarization cancellation method for pulse Doppler radar anti-suppression dragging interference. Background technique [0002] In recent years, with the continuous development of electronic jamming technology, the electronic jamming environment faced by pulse Doppler radar has become increasingly complex. According to the different platforms, suppressive noise jamming can be divided into three different jamming forms: suppressive self-defense jamming, suppressive support jamming, and suppressive towing jamming. [0003] Suppressive self-defense jamming means that the jamming signal is generated by the jammer pod carried by the target itself, and the jamming is at the same location as the target. In this case, the pulse Doppler radar can directly use the high-power noise jamming signal to track the target through the passive tracking jammer technology (...

AI Technical Summary

Problems solved by technology

[0005] The suppressed towed jamming means that the jammer is connected to the target carrier aircraft through a tow line. As a typical active jamming outside the carrier aircraft, the jamming is different from the target position, so it is impossible to track the target by passive tracking jamming source technology.

In addition, suppressive towing jamming, like the target signal, enters from the main lobe of the jammed radar, so sidelobe cancellation techniques cannot suppress this kind of jamming

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