Design and Optimization Processing of Anti-exploitation Waveform Based on Multi-point Frequency Modulation
Conventional radar linear frequency modulation waveforms and coding waveforms are easily utilized by passive non-coop-erative radars,and the current radar waveform design has not taken into account the issue of waveform exploitation.An anti-exploi-tation waveform based on multi-point frequency modulation is proposed to address this issue.In terms of waveform design,the min-imax method is used to design a special frequency coded waveform with multiple false targets after matched filtering,and then multi-point frequency modulation is applied to this waveform to destroy the sidelobe performance of matched filtering.During the processing of waveform,based on the prior knowledge of the waveform,a pre-designed notch filter is used to remove multi-point frequency modulation firstly.Then,a convex optimization method under multiple constraints is employed to design a mismatch fil-ter,and the designed mismatch filter coefficients are used for mismatch filtering to eliminate the influence of false targets,reduce sidelobe levels,and obtain good detection indicators.Simulation analysis show that the waveform has the characteristics of high sidelobe level and multiple false targets that can confuse the distance information of true targets during matched filtering,making it difficult for passive non-cooperative radars to utilize.However,optimization processing can achieve good detection performance.
anti-exploitation waveformspecial frequency coded waveformmulti-point frequency modulationmismatch filteringconvex optimization
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