An Indoor Moving Target Relocation Method Based on Interferometric Phase of Dual-Channel UAV-Mounted Through-the-Wall Radar

Uncrewed aerial vehicle (UAV)-mounted through-the-wall radar (TWR) can penetrate buildings and achieve indoor moving target detection. However, the unknown radial velocity of the moving target leads to the Doppler centroid shift and consequently deviation in the radar image. The real azimuth location cannot be obtained directly from radar images. Therefore, this article proposes a moving target azimuth relocation method based on UAV-mounted TWR. In this method, first, the dual-channel phase history of the moving target in the range-compressed domain is extracted based on the keystone transform and azimuthal noncoherent accumulation. Second, the interferometric phase is then obtained and fit using least-square method. Third, an optimization problem regarding to moving the target azimuth location is constructed and solved. Numerical simulation, field, and comparative experiments validate the effectiveness of the proposed method.