一种改进的SAR原始数据频域模拟方法  

Improved Simulation Method for SAR Raw Data in Frequency-Domain

作　　者：盛广铭[1] 张玉灵[2] 王超[1] 马德宝[1] 

机构地区：[1]信息工程大学信息工程学院,河南郑州450002 [2]郑州大学升达经贸管理学院,河南郑州451191

出　　处：《信息工程大学学报》2011年第3期338-341,373,共5页Journal of Information Engineering University

基　　金：科研基金资助项目

摘　　要：传统的原始数据频域模拟方法中系统冲激响应函数是固定不变的,且没有考虑距离徙动,影响了原始数据的模拟精度。推导了SAR点目标回波数据频域冲激响应的精确解,该精确解包含了距离徙动效应,且方位向的多普勒参数随着目标位置的变化而变化;在此基础上,给出了一种改进的SAR原始数据频域模拟方法,利用该精确解与地面场景散射单元的后向反射系数卷积得到回波数据。仿真实验表明了该方法的可行性、有效性,与传统频域模拟算法相比,该方法极大地提高了数据模拟的准确性。For traditional raw data frequency-domain simulation methods, the system impulse response function is invariable, and the infection of range cell migration （RCM） is not considered, which affects the simulation precision. This paper calculates the accurate result of SAR point target echo data frequency-domain impulse response. The accurate result includes RCM effect, and doppler parameters of azimuth are variable along with target position. Based on them, this paper proposes an improved simulation method in SAR raw data frequency-domain, and obtains echo data by convoluting accurate result and back reflectance of ground scene dispersion cell. Experimental resuits prove the feasibility and validity of the proposed method. Compared with traditional frequencydomain simulation method. It improves the accuracy of dma simulation greatly.

关 键 词：合成孔径雷达 原始数据 频域模拟 

分 类 号：TN911.7[电子电信—通信与信息系统]