A Study on ISAR Anti Deception Jamming Technology Based on Chirp Rate Varying and Compressed Sensing Imaging
Active deception jamming technology against inverse synthetic aperture radar(ISAR)is relatively mature,but research on anti deception jamming technology is still deficient.Through the analysis of the generation of false targets jamming signals,a method is used to reduce the echo gain of false targets by varying the chirp rates between pulses,which can make the chirp rate mismatch between the false target signal and the dechirp reference signal.However,due to the random variation of chirp rates,it is difficult to perform azimuth high-resolution imaging because echo signals with different chirp rates cannot be coherently accumu-lated during the imaging accumulation time.To address this issue,compressive sensing technology is performed on sparse echoes with the same chirp rate for signal reconstruction and ISAR imaging.In addition,based on the characteristics of the range profile when the chirp rate of the jamming signal is mismatched,an intelligent jamming perception method based on the entropy of the range profile is proposed,which can accurately determine whether the radar is affected by jamming and provide a basis for radar decision-making to adopt anti-jamming working mode.Simulation results show that the proposed method can accurately perceive jamming,suppress false target echoes under active deception jamming,and obtain clear ISAR images of the real target.
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