Polarization cancellation method against oppressive towed jamming of pulse Doppler radar

A pulse Doppler and radar technology, applied in the field of pulse Doppler radar anti-jamming, can solve the problems of unable to track the target angle, different interference and target positions, and unable to suppress

Active Publication Date: 2018-01-09
SHANGHAI RADIO EQUIP RES INST
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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

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  • Polarization cancellation method against oppressive towed jamming of pulse Doppler radar
  • Polarization cancellation method against oppressive towed jamming of pulse Doppler radar
  • Polarization cancellation method against oppressive towed jamming of pulse Doppler radar

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Embodiment

[0053] Example conditions: consider that the polarization mode of the radar main antenna is horizontal polarization h m =[1,0] T , the polarization of the auxiliary antenna is vertical polarization h c =[0,1] T ; The suppression dragging interference signal is set to zero-mean Gaussian white noise, and in order to avoid interference energy loss caused by polarization mismatch, its polarization mode is set to circular polarization The target polarization scattering matrix is ​​set to the rotation matrix Rotation angle θ r =30°; the current azimuth and pitch angle of the target The current azimuth and pitch angle of the towed decoy Signal-to-noise ratio (SNR) is defined as the ratio of received signal to receiver thermal noise power, SNR=20dB; interference signal ratio (JSR) is defined as the ratio of interference signal to received signal power, JSR=30dB. The direction map functions of sum road, azimuth difference, pitch difference and auxiliary channel are respective...

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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 (...

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Application Information

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IPC IPC(8): G01S7/36
Inventor 李乾郑博祝伟才吴宁宁李森
Owner SHANGHAI RADIO EQUIP RES INST
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