Indoor Target Multipath Ghost Suppression Method Based on Virtual Array Rotation

Through-the-wall radar is a vital tool to sense the indoor scene, while multiple reflections of electromagnetic waves in the room produce multipath ghost images, resulting in false alarms in target detection. The location of the ghost image is determined by the target position, indoor layout, and array structure. Accordingly, we induce changes in the ghost image's appearance by applying phase compensation to simulate the geometric delay of a rotated array, which requires no prior information about the indoor layout or neural network training. Concretely, the proposed method verifies and extracts aspect dependence by performing phase compensation signal processing of the array center rotation on the echo data and then achieves multipath ghost suppression through cross-correlation back projection and incoherent fusion. The results of simulation experiments and real data experiments demonstrate the effectiveness of the proposed method.