This paper ' s study is focused on the principle of bistatic sar on the basis of giving a brief introduction of sar principle , including azimuth resolution , mapping width , focusing deepness , pulse repetition frequency limitation and radar equation etc . then the paper studies the special form of bistatic sar with stationary transmitter 在簡要介紹了合成孔徑雷達的成像原理后,本文著重從原理方面對雙站sar進行了分析,討論雙站sar的方位向分辨率,測繪帶寬,聚焦深度,脈沖重復頻率限制,雷達方程等問題,然后對發(fā)射機固定的雙站sar這種特殊的雙站sar模式進行分析。