双基地SAR成像系统时频同步设计与试验

Timing and Frequency Synchronization Design and Experiments for Bistatic SAR Imaging System

双基地SAR成像具有常规单基地SAR成像难以实现的一些优点。常规单基地SAR成像收发一体,很容易实现SAR成像孔径合成时间内收发信号相位相参的基本要求,但该要求却是双基地SAR成像的难点。时频同步是双基地SAR成像的关键技术,文章简述了时频同步的常用方法,提出了采用GPS+高精度原子钟的时频同步设计方法,通过同步试验静态测试、微波暗室测试和动态同步试验的验证,表明该同步设计方法能够满足双基地SAR成像的需求。

Bistatic SAR imaging system has some advantages over conventional monostatic SAR system . Conventional SAR system which has transmitter and receiver in one system is easy to realize the basic requirements of signal phase coherent ,but this request is difficult to bistatic SAR imaging system . Time and frequency synchronization is the key technology of bistatic SAR imaging system .The paper outlines the common frequency synchronization methods and proposes a design using GPS ＋ precision atomic clock time .Through the static testing ,anechoic chamber testing and dynamic synchronization test ,it verified that the synchronous design method can satisfy the needs of bistatic SAR imaging system .