Moving target detection and velocity estimation using multiple subband DPCA and ATI method for triple-channel UWB SAR

With long coherent processing time, the ATI method is suitable to detect moving targets with multi-channel UWB SAR system. However, the traditional ATI method will induce the blind velocity and the velocity ambiguity. Moreover, its detection performance will drop rapidly when the moving target signal is contaminated by the foliaged clutter. To overcome these shortcomings of traditional ATI method, this paper proposes a new multiple subband DPCA and ATI method for triple-channel UWB SAR. By applying a DPCA step before ATI, the introduced method can ldquosift outrdquo the interfering clutter from moving targetpsilas signal and alleviate the influence of clutter on the interfering phase. Moreover, the introduced method can detect moving targets without blind velocity and estimate their range velocities without ambiguity by combining the interferograms at different subband central frequencies. The validity of the proposed method is proved based on the experiments on UWB SAR real data.