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

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