| Citation: | LI Xin, WANG Chunyang, FU Xiaolong, et al. Shift-frequency jamming suppression technique based on polarized channel expanding and blind source separation union[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(4): 731-737. doi: 10.13700/j.bh.1001-5965.2016.0250(in Chinese)
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Multiple shift-frequency jamming is an effective coherent jamming type to linear frequency modulation (LFM) pulse compression radar, which could produce multiple false targets before and after real target when it is applied in self-defense jamming. Considering the jamming suppression problem, a method based on blind source separation (BSS) to separate echo and jamming signals and frequency compensation to suppress jamming signal is proposed. First, the feasibility of cross polarized channel expanding was illustrated. Second, a radar-receiving-signal model was established after channel expanding. The separability of echo and jamming signal was discussed. Finally, the jamming suppression method based on the maximum signal-to-noise ratio blind source separation and frequency compensation was studied, and the influence of accessional noise from jammer was analyzed. Simulation results show that the proposed method could extract the target echo signal from the mixed signal effectively even when the jamming-to-signal ratio is 20 dB, which will suppress the main lobe shift-frequency jamming.
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