Instantaneous DOA estimation for moving wideband cyclostationary sources under multipath

Cyclostationarity has been exploited in direction of arrival (DOA) estimation due to its signal selectivity and immunity against noise and interference. For coherent signals, e.g., those arising from a multipath propagation environment, the resulting rank deficiency of the signal cyclic correlation matrix hampers proper DOA estimation. Spatial smoothing (SS) is an effective tool to cope with this problem. However, SS reduces effective array span, thus also reduces the DOA resolution as well as the number of detectable sources. In this paper, we propose an instantaneous DOA estimation method for moving wideband cyclostationary sources under a multipath environment. Based on the movement of the sources, our method is able to decorrelate wideband coherent signals caused by multipath without SS. Effectiveness of our method is demonstrated by simulations.