Abstract:

The influence of frequency modulation(FM)interfer-
ence on correlation detection performance of the pseudo random
code continuous wave(PRC-CW)radar is analyzed.It is found
that the correlation output deteriorates greatly when the FM inter-
ference power exceeds the anti-jamming limit of the radar.Accord-
ing to the fact that the PRC-CW radar echo is a wideband pseudo
random signal occupying the whole TF plane,while the FM in-
terference only concentrates in a small portion,a new method is
proposed based on adaptive short-time Fourier transform(STFT)
and time-varying filtering for FM interference suppression.This
method filters the received signal by using a binary mask to excise
only the portion of the TF plane corrupted by the interference.Two
types of interference,linear FM(LFM)and sinusoidal FM(SFM),
under different signal-to-jamming ratio(SJR)are studied.It is
shown that the proposed method can effectively suppress the FM
interference and improve the performance of target detection.