The study of Range Doppler Algorithm in focusing Bistatic SAR

Comparing to monostatic SAR, Bistatic SAR has specific advantages, such as the reduced vulnerability in military systems, additional information about the target and characteristics of signal. Nevertheless, it brings the complication of processing algorithms because of the range history of a Bistatic target is the sum of two hyperbolic range equations, which give a double square-root term in the range equation, and the traditional RD algorithms using in monostatic SAR can not apply for processing Bistatic SAR. This paper obtained the point target signal by establishing the echo signal model, then derived the approximate two-dimensional spectrum of echo signal by using POSP, and a Range Doppler Algorithm suitable for Bistatic SAR is presented. The algorithm is validated by the simulation experiments of point targets.