机载冰川厚度探测雷达非线性CS成像算法研究  

Research of Nonlinear Chirp Scaling Algorithm for Air-borne Glacier Penetrating Radar System

作　　者：赵博[1,2] 刘小军[1] 方广有[1] 

机构地区：[1]中国科学院电子学研究所高功率微波与电磁辐射重点实验室,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《电子学报》2009年第7期1422-1427,共6页Acta Electronica Sinica

基　　金：国家863高技术研究发计划(No.2008AA12Z114)

摘　　要：针对高分辨率成像冰川厚度探测雷达涉及的两层媒质成像问题,文中分析了冰川探测雷达的空间几何模型,研究了一种修正的非线性Chirp Scaling(CS)改进成像算法,该算法能对电磁波在不同媒质界面产生的折射效应和不同媒质中传播速度的变化进行自动校正,并能有效改善散射点的聚焦性能.基于回波信号形式,推导并给出了成像算法的各相位补偿因子表达式及算法实现步骤,并利用该算法对分布于场景中心及边缘的点目标进行了成像仿真,验证了算法的有效性.Based on the two-layer media imaging problem that high-resolution imaging glacier penetrating radar （HRI-GPR） system has, this paper analyzes the spatial geometry and studies a modified nonlinear chirp scaling algodthm which can compensate the refraction effects and the propagation velocity changes in different medium automatically. This algorithm also can improve the focusing feature of the scatter. According to the model of echo signal, the phase compensation factors and realized steps of algorithm are given. Raw data of the radar is simulated, and image is achieved by using the algorithm proposed. The imaging quality is compared with theoretical value. Experimental results demonstrate the validity of the proposed algorithm.

关 键 词：冰川探测雷达 非线性chirp SCALING算法 冰川厚度 正下视 

分 类 号：TN957.5[电子电信—信号与信息处理]