摘要
分布式小卫星SAR天线面小,存在严重的多普勒模糊,联合处理多颗卫星的回波可以有效消除模糊,实现高分辨宽测绘带成像。以一发双收的分布式构型为例,建立其回波信号模型并分析了两路回波信号之间的关系,在补偿由切航向基线引起的包络差和部分相位差后,得到两路回波信号频谱之间关系的解析表达式。根据回波谱之间的关系,设计加权函数,消除了回波的方位模糊,最后采用传统成像算法完成成像。
For a 3-D distributed space-borne SAR, small area antenna leads to serious Doppler ambiguity. Joint processing of all echoes from multiple antennas is able to eliminate Doppler ambiguity and obtain high resolution and wide swath. This paper firstly builds the echo model for the formation of one transmitting and two receivings. Then the relationship between the two received echoes is analyzed. After compensation for envelope difference and part of phase difference, the analytic expression which describes the frequency spectnan relationship between two echoes can be obtained accordingly. Based on this equation, two weight functions are designed to eliminate the Doppler ambiguity. Finally, a conventional imaging algorithm is used to get SAR images.
出处
《国防科技大学学报》
EI
CAS
CSCD
北大核心
2009年第2期64-69,共6页
Journal of National University of Defense Technology
基金
国家部委基金资助项目(41307020203)
关键词
分布式星载SAR
切航向基线
方位解模糊
distributed space-borne SAR
baseline across track
eliminating Doppler ambiguity
