基于阵元脉冲编码的SAR距离解模糊  

SAR Range Ambiguity Resolution Based on Element-Pulse-Coding

作　　者：兰岚 廖桂生[1] 王寒冰 许京伟[1] LAN Lan;LIAO Guisheng;WANG Hanbing;XU Jingwei(National Key Laboratory of Radar Signal Processing,Xidian University,Xi’an 710071,China;8511 Research Institute of China Aerospace Science and Industry Corporation,Nanjing 211100,China)

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071 [2]中国航天科工集团八五一一研究所,江苏南京211100

出　　处：《无线电工程》2021年第8期675-680,共6页Radio Engineering

基　　金：国家自然科学基金资助项目(61931016,62071344,61911530246)。

摘　　要：针对多输入多输出(MIMO)-合成孔径雷达(SAR)中的距离模糊抑制问题,提出了一种阵元脉冲编码(EPC)技术来实现高分辨宽测绘带(HRWS)SAR成像。通过对编码设计进行合理设计,将多个模糊距离区域对应的主瓣回波在方位空域进行分辨。针对特定的距离模糊区,能够通过空域滤波提取出所假定的期望距离区域的主瓣回波,同时抑制来自其他距离模糊区域的回波分量。经过传统的成像算法处理后,可分别得到不同距离区域的高分辨SAR图像,进一步可将来自期望的区域图像进行组合得到HRWS-SAR图像。通过仿真实验,验证了所提方法在解模糊和HRWS-SAR的有效性。To suppress the range ambiguity in multiple input multiple output(MIMO)-Synthetic Aperture Radar(SAR),an element pulse coding(EPC)technique is proposed to realize high resolution wide swath(HRWS)SAR imaging.By designing an appropriate coding coefficient,the mainlobe echoes from multiple range ambiguous regions can be distinguished in the spatial domain.Hence,for each specific range ambiguity region,the mainlobe echo of the assumed expected range ambiguity region can be extracted by spatial filtering,and those of other range ambiguity regions can be suppressed.After conventional imaging processing in SAR,the high-resolution images of the range regions can be separately obtained,and the HRWS-SAR images of the desired region can be formed.Finally,simulation results are provided to verify the effectiveness of the proposed method in suppressing the range ambiguity and obtaining the HRWS-SAR images.

关 键 词：合成孔径雷达 距离模糊抑制 阵元脉冲编码 高分辨宽测绘带 

分 类 号：TN958.5[电子电信—信号与信息处理]