Parameters Estimation and Imaging of Ground Moving Target in One-stationary Bistatic SAR

In this paper, the received signal equation of moving target with constant acceleration in a special case of BSAR, named one-stationary,in slant range plane is derived. In one-stationary geometry, usually range curvature and Doppler ambiguity is very large due to wide beam-width and assumption of accelerating movement of target. Hence, transforms such as Radon and Keystone have little accuracy for both estimating Doppler centroid and removing range cell migration. In this paper two-step algorithm is proposed for exact estimation of Doppler centroid. That is a combination of radon transform and a search algorithm.Then, by extraction of a system of equations, an accurate estimation of target’s velocity and acceleration is obtained and finally, an image formation algorithm is presented. Compared to usual algorithms, the accuracy of the derived equations and the strength of the proposed algorithm in the the presence of noise and clutter is confirmed by simulations.