关键词: 平行等速双基合成孔径雷达, 隐函数导数法, 距离多普勒算法

Abstract:

There are two square-root terms in the range history of a return signal from a Bistatic Synthetic Aperture Radar (BiSAR). The transfer function for imaging in the 2-D frequency or range Doppler domain using the principle of stationary phase cannot be analytically derived. To address this problem, we approximate the stationary phase of the 2-D spectrum with an expansion of the Taylor series at the azimuth frequency, and call the approximation the derivatives of an implicit function. After algebraic manipulation, the 2-D spectrum is obtained for an azimuth invariant BiSAR. With the proposed method we dissolve one square-root term out of two for an azimuth invariant BiSAR, which is especially advantageous in implementation of an imaging algorithm. Then, a modified Range Doppler Algorithm (RDA) is developed to process the BiSAR data. The promising results of simulation and real data processing are obtained.

Key words: azimuth invariant bistatic synthetic aperture radar, the derivatives of an implicit function, range Doppler algorithm