Deception Jamming Suppression Method of LFM Fuze Based on STFRFT
Nian Peng-le · Journal of Naval Aeronautical and Astronautical University · 2015
Aiming at the deception jamming for LFM fuze, a new method based on STFRFT(short time fractional fourier transform) was proposed to suppress the interference. The frequency modulation ratio of SVLFM(slope varying linear frequency modulation) fuze changed at random in every pulse period, so the target echo and the deceptive signal could be separated by FRFT. Because of the characteristic that the max amplitude of STFRFT was linear with the windowing width for the same LFM signal, but the max amplitude was not change with the windowing width if two frequency modulation ratio was different, then the target echo could be distinguished from the false target signal effectively under low SJR. Simulation results showed that the principle was right and the method had good ability to suppress deceptive interference.