四阶传递函数算法用于斜视SAR成像

Fourth-order Transform Function Algorithms for Squint SAR Imaging

针对SAR的斜视工作模式,该文仔细分析了目标方位相位史和斜视角变化对方位相位的影响,从系统传递函数出发,详细推导了四阶传递函数算法,并对比分析了传递函数与Chirp Scaling算法,指出传递函数算法的主要特点,点目标仿真试验证明了该方法的合理性。

Based on the squint SAR mode of SAR system, this paper carefully analyses the azimuth phase history of the target and the impact of squint angle change to azimuth phase, and deduces the fourth order transform function algorithm from analyzing the system transform function, and contrastively analyses the transform function algorithm and the Chirp Scaling algorithm, and indicated the main character of the transform function. The point target simulation results show that the algorithm based on the fourth order transform function is reasonable for the squint SAR.