Anti aiming jamming method of LFM signal based on ACM
Aiming jamming seriously affects radar detection performance for targets due to its concentrated jamming energy and high jamming intensity.Point at aiming jamming,a signal anti jamming method is proposed based on amplitude code modulation(ACM)signal.Firstly,ACM signal is designed to shift the spectrum of radar signal and shift the frequency of match filter according to the ACM signal parameters,with the aim to obtain the reference signal of pulse compression of harmonic.Secondly,pulse compression is applied to the harmonic to obtain the one-dimensional range profile of the target echo at the harmonic.Then,energy compensation is performed to compensate the energy loss caused by ACM,and obtain the one-dimensional range profile of the target consistent with the original signal echo.Finally,the process of ACM and the operation of echo anti jamming is given and verified by digital simulation.Simulation results shows that the one-dimensional range profile of target echo obtained by the proposed method is basically consistent with that obtained by undisturbed signal.When the modulation frequency is 5 times of the signal bandwidth,the anti aiming jamming performance of ACM signal is improved by 32 dB compared with the original signal.
amplitude codeaiming jammingmatch filterdetection probability
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