Unambiguous Velocity Estimation for Fast Moving Targets Using Single Channel SAR
Zhang Xue-pan① Liao Gui-sheng① Zhu Sheng-qi① Shu Yu-xiang② Li Dong③
①(National Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, China) ②(No.38 Research Institute of CETC, Hefei 230088, China) ③(Center of Communication and Tracking Telemetering Command, Chongqing University, Chongqing 400044, China)
Abstract：A phase-based method using a single channel SAR is proposed to estimate the radial velocity of ground moving targets unambiguously. Two-look operation in the range frequency domain and interferometry in the Doppler domain are done made to keep the phase meet the assumption of phase continuity. The lease squares linear fitting is used to estimate the slope between interferometric phase and Doppler frequency, and the radial velocity can be calculated by the slope. The proposed method possesses the advantage of being independent on phase wrapping. Compared with the single channel amplitude-based method, the method is able to provide greater precision and usefulness. The radial velocities of multi-targets can be estimated simultaneously in the Doppler domain. Experimental results validate the effectiveness of the proposed method.
2014, Vol. 36 
