Detection of weak, broadband signals under Doppler-scaled, multipath propagation

The detection of weak, broadband signals under Doppler-scaled, multipath propagation is addressed. In general, the received signal may contain both strong and weak path receptions. The ambiguities (i.e., floor level or 2-D sidelobes) of the strong paths may interfere with the detection of the weak paths. In this study, the strong paths were regarded as the unwanted signals which must be eliminated in order to detect the weaker paths. The proposed method is a simple yet effective means for eliminating the ambiguities associated with the strong paths without significantly affecting the weak paths. This method has the advantage that removing the strong paths at a single Doppler channel is equivalent to removing the entire floor level associated with the strong paths