%0 Journal Article
%T The Optimal Across-Track Baseline of Distributed Small Satellites Synthetic Aperture Radar for Terrain Elevation Measurement<br>分布式小卫星合成孔径雷达三维地形成像的最优垂直轨迹基线
%A Xu Hua-ping
%A Zhou Yin-qing
%A Li Chun-sheng
%A <br>徐华平
%A 周荫清
%A 李春升
%J 电子与信息学报
%D 2006
%I 
%X In distributed small satellites-synthetic aperture radar (DSS-SAR), the correlation of echoes is determined by both across-track and along-track baselines which are coupling, and the multi-baseline interferometry is obtained with multi small satellites SAR images. The optimal across-track baseline of DSS-SAR for terrain elevation measurement is more complicatedly determined than that of conventional SAR interferometry. A novel approach is presented in this paper to determine the optimal across-track baseline of DSS-SAR multi-baseline interferometry. On the basis of the statistical characteristics of phase difference of complex SAR image pair, the DSS-SAR interferometric phase estimation Crammer-Rao bound is deduced. The relationship between terrain height accuracy and across-track baseline is presented from the bound. And then the optimal across-track baseline is derived via derivative calculation. Finally, the optimal across-track baseline in different DSS-SAR configuration with three small satellites is calculated and analyzed. It is showed that the optimal baseline of single across-track baseline interferometry according to this paper is in agreement with that from known single satellite SAR interferometry. The result validates the novel approach proposed by this paper.
%K SAR<br>分布式小卫星
%K 最优基线
%K 编队构形
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=EFC0377B03BD8D0EF4BBB548AC5F739A&aid=00D925F9C6180EEC&yid=37904DC365DD7266&vid=D3E34374A0D77D7F&iid=0B39A22176CE99FB&sid=9D9F10A828991FA6&eid=A04F01817ECB9A48&journal_id=1009-5896&journal_name=电子与信息学报&referenced_num=0&reference_num=10