Research on the Extremum Points of Range-surface and Doppler-surface for Bistatic SAR

摘要

In the SAR system, some closed iso-range or iso-doppler contours in the area illuminated by the transmittermean the ambiguity of some scattering points. In order to understand the closed properties of the iso-range oriso-doppler contours for bistatic SAR the paper studies the extremum points of range-surface anddoppler-surface according to several mathematical models related to range and doppler. The formula forcalculating the position of extremum point of range-surface has been given and several important conclusionsabout the stagnation or extremum points of doppler-surface have been drawn. Simulation results are providedand the theoretical analyses are validated.