Point spread function generation method of Geo-stationary GNSS based bistatic forward looking SAR

Abstract

Abstract GNSS based Bistatic Forward Looking Synthetic Aperture Radar (GNSS-BFLSAR) system is particular kind of passive bistatic SAR system. In the system, GNSS is used as the transmitter, while the receiver is mounted on the airplane. The airplane travels along a straight line and the imaging target is in the front. GNSS-BFLSAR is benefited from low cost and good safety. It is widely used in self-landing, self-navigating and battle field information acquiring, etc. This paper is focusing on the investigation of point target 2-D spectrum of GNSS-BFLSAR and Point Spread Function (PSF) generation method. First, a geometric model of such system is built, followed by the generation of echo signal. Then, the analytical formula of 2-D spectrum is obtained. Next, the PSF generation is provided. In the end, the whole procedure is simulated with Matlab. The simulation result verifies the validity of theoretical analysis of this paper and makes a foundation for imaging formation research of such system in the future.