A Modified Frequency Scaling Algorithm for Missile-Borne SAR Imaging

The researches of imaging algorithms for synthetic aperture radar (SAR) is focused on the air- and space-borne SAR from the theory of SAR was formed . In this paper, we propose a modified frequency scaling algorithm for missile-borne SAR imaging. According to the characters of missile-borne SAR including high flight speed, non-straight movement with non-constant velocity and big squint angle, which forward a greater requirement for real time performance, precision of the motion compensation. On the base of the missile-borne SAR geometry, we described the complete derivation of the algorithm and the refined frequency scaling factors of each signal domain, the refined azimuth scaling factor can reduce azimuth time expansion and improve efficiency of azimuth processing. Then simulated the algorithm using Matlab programs in computer, analyzed the imaging result of the point target. And the simulation verified the algorithm is valid.