Suppression of Active Deception Jamming Based on FFT
Zhang Yong-qian · Radar Science and Technology · 2013
Based on DRFM jammer,active deception jamming seriously affects the capability of the radar obtaining true target information because of its similar pulse compression gain of target echo and vivid target behavior.In view of this kind of jamming,according to the radar receiver matched filter,pulse compression signal matrix(PCSM)of radar echo is obtained.By FFT of the PCSM row,pulse compression signal spectrum matrix(PCSSM)of radar echo is got.Based on frequency point estimation of target echo in the PCSSM, band-pass filter could be obtained.According to the filter and the PCSSM of radar echo,the PCSSM of target echo could be got.Then the PCSM of target echo is obtained by IFFT of the PCSSM row.So the suppression of active deception jamming based on the FFT is got.The simulation results show that when the number of radar echo pulses is 60,the signal-to-jamming ratio improving factor of the FFT algorithm is about 20dB in Swerling I,while it is about 19dB in Swerling II.