Sidelobe cancellation method and system

Abstract

The invention provides a sidelobe cancellation method. The method comprises the following steps that 1, the maximum number and direction of active jamming which needs to be subjected to cancellation are obtained; 2, multiple needed channels are selected on an array plane of a phase array to serve as auxiliary channels according to the number and direction; 3, weights of all the auxiliary channels are set according to the signal strength of active jamming; 4, the auxiliary channels are controlled to complete cancellation of sum main channels and difference main channels which are different in wave position on the basis of an open-loop adaptive sidelobe cancellation principle, and therefore active jamming or passive jamming is inhibited. Correspondingly, a sidelobe cancellation system comprises a phased-array antenna, a digital receiver, a digital waveform forming board and a sidelobe cancellation processing board. According to the method, partial array elements of the array plane of the phase array are selected as the auxiliary channels, additional auxiliary antennae are not needed, the hardware complexity is not increased, the cost is reduced, the setting flexibility of the auxiliary antennae is achieved, the open-loop adaptive sidelobe cancellation principle is adopted by the system, it is guaranteed that sidelobe cancellation can be adaptively completed, and the operation method is simplified.

Description

technical field [0001] The invention relates to the technical field of phased array radar signal processing, in particular to a side lobe cancellation method and system. Background technique [0002] As we all know, radar is not only an important means of monitoring enemy actions, but also the main target vulnerable to enemy interference. The electromagnetic environment faced by radar is becoming more and more complex. In order to fully play the role of radar in war, radar is required It has strong anti-interference ability. [0003] Adaptive sidelobe cancellation technology is an effective method to deal with active interference. Using the adaptive sidelobe cancellation system can make the sidelobe zero point of the radar antenna adaptively align with the direction of arrival of the interference, and suppress the interference to the greatest extent. From the perspective of spatial filtering, the antenna pattern is a spatial filter, and the sidelobe canceller changes the s...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a sidelobe cancellation method and system based on a phased array of partial array elements based on a large area array and on the basis of digital beamforming, so as to solve the problem of the existing sidelobe cancellation system. Existing problems of complex structure, inflexible processing, and inability to self-adaptively cancel each interference source in time

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