A geometry-based hough transform estimation for radial velocity of moving target using single antenna SAR

Accurate and real-time radial velocity estimation is a key challenge for the SAR-GMTI system using a single channel. To reduce the heavy computation load O(MN) of the conventional Hough transform (HT) estimation (CHTE), an efficient HT estimation (EHTE) is proposed by exploiting the geometry information. The geometry relationship among the range walk angle and the two HT angles is modeled by utilizing the lengths of the HT ranges. Independent of the searching operation, the proposed EHTE not only reduce the computation complexity from O(MN) to O(2N) but also break through the estimation accuracy bound of CHTE due to the searching step size. Simulation is given to demonstrate the effectiveness of the EHTE method.