基于扩展DPCA的大测绘带SAR研究  

Investigation of High Resolution Wide Swath SAR by Extend DPCA

作　　者：王志奇[1,2] 梁兴东[1] 丁赤飚[1] 

机构地区：[1]中国科学院电子学研究所微波成像技术实验室,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《微计算机信息》2009年第7期279-281,共3页Control & Automation

基　　金：申请人:梁兴东;武器装备预研基金项目(编号不公开)

摘　　要：在星载合成孔径雷达设计中,高分辨率和宽测绘带是一对矛盾,针对这一矛盾,本文深入研究了扩展DPCA方案,使用正交发射信号提高DPCA系统的性能,且不增加额外系统带宽。探讨了发射波形的选择,指出频分发射波形使得方位向相位不连续,提出采用调频率绝对值相等符号相反的两LFM信号作为正交发射波形,结合交叉匹配滤波方法抑制同频干扰。最后通过仿真验证了该方法的可行性。High Resolution and Wide Swath （HRWS） are two contradicting requirements in spaceborne SAR design. To deal with the problem, an extend DPCA scheme is investigated, which introduces orthogonal transmission to improve the DPCA performances without additional bandwidth expense. The transmitting waveform is studied in detail. It shows frequency division transmission brings phase discontinuity along track. The up and down chirp signals are proposed, associated with a Cross Matched Filtering method to suppress the shared-band interference. Finally a simulation is performed to verify the feasibility of the method.

关 键 词：合成孔径雷达 偏置相位中心天线 高分辨率大测绘带 干扰抑制 

分 类 号：TN957[电子电信—信号与信息处理]