基于脉内波束指向的单相位中心多波束星载SAR系统接收端DBF处理  

Digital Beamforming for Single Phase Center Multi-beam Spaceborne SAR Based on Intrapulse Beamsteering

作　　者：李杨[1,2] 齐维孔[1,2] 黄杰文[1,2] 禹卫东[1] 

机构地区：[1]中国科学院电子学研究所,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《电子与信息学报》2011年第5期1119-1125,共7页Journal of Electronics & Information Technology

摘　　要：该文将单相位中心多波束(SPCMB)星载SAR系统与脉内波束指向相结合,有效地解决了传统SPCMB-SAR系统方位模糊较大的问题。该文推导了接收端方位向、距离向及2维联合数字波束形成(DBF)的处理方法,并归纳出先方位向DBF后距离向DBF,先距离向DBF后方位向DBF,以及2维DBF 3种处理流程。同时分析了该系统的主要系统参数,对比了3种处理流程的数据率和计算复杂度。仿真验证了3种处理方法的有效性,并通过模糊度分析证明采用该系统能降低方位模糊和距离模糊,有效实现高分辨率宽测绘带成像。This paper studies single phase center multi-beam spaceborne SAR based on intrapulse beamsteering by combining spaceborne Single Phase Center Multi-Beam（SPCMB-SAR） and intrapulse beamsteering in order to reduce large azimuth ambiguity.The principle of digital beamforming for receiving signal process is explored,including azimuth DBF,elevation DBF and two-dimensional DBF.Three kinds of DBF processing methods are proposed,including azimuth DBF first and elevation DBF later,elevation DBF first and azimuth DBF later,and two-dimensional DBF.The primary system parameters are analyzed.Data rate and calculation complexity of the three methods are compared.Simulation results show that all methods are effective.Ambiguity analysis confirms that the SPCMB-SAR system proposed in this paper can reduce range ambiguity and azimuth ambiguity and realize high resolution wide swath SAR imaging effectively.

关 键 词：合成孔径雷达 单相位中心多波束 脉内波束指向 数字波束形成 模糊分析 

分 类 号：TN959.74[电子电信—信号与信息处理]