应用二维电扫描的星载SAR凝视马赛克模式研究  

Study on a Space-borne SAR Staring Mosaic Mode Based on Two-dimensional Electronic Steering

作　　者：韩晓磊[1] 张庆君[1] 刘杰[1] 张润宁[2] 

机构地区：[1]北京空间飞行器总体设计部,北京100094 [2]航天东方红卫星有限公司,北京100094

出　　处：《航天器工程》2016年第3期17-25,共9页Spacecraft Engineering

基　　金：国家重大航天工程

摘　　要：应用机械扫描实现的星载SAR马赛克模式对卫星平台敏捷机动能力提出高的要求,且由于存在不完全分辨率区域,导致成像效率下降。文章提出一种应用二维电扫描的星载SAR马赛克模式实现方案,它利用二维电扫描,形成多个彼此相邻的聚束图像块,通过拼接这些相邻的聚束图像实现成像范围的扩展,称之为凝视马赛克模式,对应地称采用机械扫描实现的马赛克模式为滑动马赛克模式。文章针对凝视马赛克模式的特点,提出了一种新的系统参数设计方法,通过系统参数设计实例对比分析了凝视马赛克模式和滑动马赛克模式的特点。此外,还分析了相控阵天线不同天线结构对凝视马赛克模式的影响,并通过优化设计得到了满足需求的系统参数。The space-borne SAR mosaic mode realized by mechanical steering requires very high agility maneuver ability,and the appearance of the imaging area with incomplete resolution brings on the decrease of the imaging efficiency.In the paper,we propose a novel mosaic mode based on two-dimensional electronic steering.The mode can generate many adjacent spotlight images using two-dimensional electronic steering.Then,it extends the coverage by integrating the spotlight images.In this paper,we name the novel mosaic as staring mosaic,whereas name the mosaic mode realized by mechanical steering as sliding mosaic.According to the characteristics of staring mosaic,we present a new system design method in the paper.Furthermore,staring mosaic mode is compared with sliding mosaic mode with a system design example.Moreover,we analyze the effect of different antenna configurations to staring mosaic mode.Finally,through optimization design,a satisfied system example is present.

关 键 词：合成孔径雷达 凝视马赛克 电扫描 高分辨率宽测绘带 

分 类 号：TN957.52[电子电信—信号与信息处理]