The Imaging Analysis of Asynchronous Bistatic SAR with Parallel Tracks

摘要

The imaging of bistatic SAR with asynchronous transceiver positions is studied in this paper. First of all, the geometry of the asynchronous transceiver model is constructed, and the approximation model of the echo from the bistatic SAR is obtained based on the analysis of the instantaneous transceiver distance. Asynchronous transceiver positions will lead to non-uniform SAR data. This paper first analyzes the method for transforming the asynchronous bistatic model into a monostatic variable motion model. Then with the non-uniform FFT, it resolves the non-uniform sampling problems induced by nonconstant velocities. The simulation experiments show that the bistatic SAR images have good quality, which verifies the validity of the method presented in this paper.