Frequency-agile signal forwarding interference suppression method based on mimo radar

Abstract

The invention proposes a frequency agility signal transponder interference suppression method based on MIMO radar, which mainly solves the problem of poor effect of transponder interference suppression in the prior art. The implementation plan is as follows: first construct the scene where the MIMO radar transmitting array is located; the MIMO radar transmits frequency-agile OFDM-LFM signals in this scene; the MIMO radar simultaneously receives the target echo signal and the interference echo signal; the MIMO radar signal processing system The target echo signal and the interference echo signal are summed to obtain a combined signal; the MIMO radar signal processing system performs a matching filter operation on the combined signal to obtain the output result of the matched filter and complete the forwarding interference suppression. The invention has strong adaptability to different radar systems, reduces the transmission signal conversion requirement of the radar system, is conducive to improving the effect of forwarding interference suppression, improves the anti-interference ability, and can be applied to MIMO radar target detection and identification.

Description

Technical field [0001] The present invention belongs to the field of radar signal processing technology, particularly relates to a frequency agile signal transponder interference suppression method, may be applied to MIMO radar target detection and identification. Background [0002] MIMO radar is a new system radar system in which quadrature signals are transmitted by the antenna at the transmitter end, and the antenna at the receiver receives various echo signals and processes them jointly. MIMO radar uses digital methods to control the transmission signal of each transmitting unit, so that the transmitted signal of each transmitting unit is orthogonal to each other, so that the individual transmitted signals cannot be coherently superimposed in space to form a narrow transmission beam of high gain, but incoherently superimposed to form a wide transmission beam of low gain, which has great potential in transponder interference suppression. [0003] Frequency agility refers to ...

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Problems solved by technology

[0004] "Research on Radar Anti-Jamming Technology Based on Waveform Agility" published by Lin Houhong in 2016 based on OFDM-LFM signals, proposed a forward-type interference suppression method based on monopulse radar, but this method is only applicable to monopulse radar. Not very adaptable to different radar systems

[0005] "DRFM range false target cancellation method based on slope-varying LFM chirp signal" published by Li Wei et al. in 2017 proposed a method for reconstructing interference signals based on false target parameters by using linear frequency modulation signals with pulse-to-pulse modulation frequency jumps randomly achieves repeating interference suppression, but this method fails when the radar system cannot switch the transmit waveform between pulses

[0006] Based on the orthogonal waveform model of OFDM-LFM transmitted signals, Zhou Huimin's "Research on Low Interception and Anti-Jamming of Missile-borne MIMO Radar" published in 2018 proposed a forward-type interference suppression using the orthogonality between OFDM-LFM signals. However, this method has low interference suppression ability when the orthogonality between transmitted signals is poor.

[0007] Some methods in the above research put forward extremely strict requirements on the transmission waveform conversion function of the radar system; some methods are not adaptable to different radar systems; some methods have low interference suppression ability

In short, there is no ideal frequency-agile signal forwarding interference suppression method in the prior art

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