Ground Maneuvering Target Imaging and High High-Order Order Motion Parameter Estimation Based on Second Second-Order Order Keystone and Generalized Hough-HAF Hough Transform
Abstract: This paper proposes a new method to focus a ground moving target with complex motions and estimate its motion parameters in a synthetic aperture radar (SAR) system. In this method, the second second-order order Keystone transform is applied to correct the range curvature. re. Then, the Hough transform is applied to estimate the slope of the range walk trajectory, from which the target cross cross-track track velocity is obtained. Finally, a generalized Hough Hough-high-order order ambiguity function (GHHAF) transform is applied to transform the ta target signal into a 2-D D time-frequency time plane and estimate its slope associated with the third third-order order Doppler parameter. Compared with the conventional SAR imaging methods using the second-order second phase model, the proposed method can obtain better imaging quality quali since the third-order order Doppler frequency migration is effectively eliminated. Both simulated and real data processing results are provided to validate the effectiveness of the proposed algorithm.