斜视SAR原始回波数据频域模拟快速算法  

Fast Algorithm for SAR Raw Signal Simulation with Large Squint Angles

作　　者：王锦章 

机构地区：[1]海军驻北京地区电子设备军事代表室,北京100070

出　　处：《电子科技》2015年第11期8-12,共5页Electronic Science and Technology

摘　　要：针对合成孔径雷达斜视模式下,传统的二位频域快速算法难以精确模拟出斜视SAR距离徙动及空变特性的问题,提出一种高效的斜视SAR回波原始数据二维频域快速算法,该算法通过去走动处理将多普勒中心搬移到零多普勒处,重新推导了去走动后的系统传递函数,在距离频域-方位时域上模拟了距离走动和回波的空变特性,并保证了回波数据的准确性。通过仿真分析表明,本算法在保证斜视SAR回波数据的模拟精度的基础上,计算效率远高于时域算法以及沿距离向积分算法。In this paper, a two-dimensional Fourier domain SAR raw signal simulation algorithm with large squint angles is presented. There exists serious coupling between azimuth and range for synthetic aperture radar （SAR） in large squint mode. It is difficult to simulate this coupling using traditional frequency-domain algorithm. Therefore, the geometric model of large squint mode SAR and reason of coupling are both analyzed. We modify the traditional frequency-domain algorithm to handle the large squint mode. The key of algorithm is to use a linear range cell migration correction to simulate the range-azimuth coupling. The results show that the algorithm improves both the computational efficiency and the simulation accuracy. Simulation results demonstrate the validity of the proposed algorithms.

关 键 词：回波数据模拟 合成孔径雷达 斜视SAR 距离徙动 

分 类 号：TN958[电子电信—信号与信息处理]