Multipath Ghost Suppression Based on Frequency Domain Filtering for Through-the-Wall Radar

Moving target detection based on unmanned aerial vehicle (UAV)-borne multichannel through-the-wall radar has found wide applications in military and civilian domains. However, multipath reflections within indoor environments lead to multipath ghost in imaging results, which cause the generation of false alarms. To address this issue, this article proposes a method for suppressing multipath artifacts in UAV-borne multichannel through-the-wall radar based on frequency-domain filtering. In the proposed method, the differences between the multipath echoes and the direct path echoes in the range-Doppler domain are analyzed. Subsequently, a frequency domain filtering method is proposed to filter out multipath echoes. Finally, the back-projection algorithm is used to achieve through-the-wall imaging. Simulations demonstrate the feasibility and effectiveness of the proposed method.