A ground moving target detection and imaging method in Doppler-rate domain for Bistatic forward-looking SAR

Current literatures and reports about Bistatic forward-looking SAR (BFSAR) imaging theories are mostly concentrated on static scene. In this paper, a novel GMT detection and imaging method in Doppler-rate domain for BFSAR is presented. The steps of this method involve bulk-deramp filtering operation, Keystone transform (KT), extend azimuth nonlinear chirp scaling (EA-NLCS) processing and the last detection step based on product second-order ambiguity function (PSAF). After the above steps of the method, if the PSAF of a certain range bin has more than one sharp peak, we can argue that there is a GMT in the relative range bin. Then using the GMT´s Doppler rate estimated by PSAF, the echo of GMT can be focused, thus the goals of GMT detection and imaging for BFSAR are achieved. Numerical simulations verify the effectiveness of the proposed method.