Abstract: The detecting performance of the external illuminator base bistatistic continuous wave radar system is greatly influenced by the direct signal and the multipath reflected clutter received by the main receiving channel. This paper presents an effective external illuminator based bistatistic continuous wave radar clutter canceling algorithm to overcome the problem. The presented algorithm employs the auxiliary receiving channel reference signal to adaptively cancel the direct signal and multipath reflected clutter by using the fractional interpolated arrival time interval of such clutters. Experimental results on real collected data show the method improves the detecting performance for a moving target by offering an average detection gain of about 45dB.

Key words: fractional arrival time estimation, external illuminator, direct signal, multipath reflected clutter