A Phase Synchronization Approach for Bistatic SAR Systems

Konferenz: EUSAR 2006 - 6th European Conference on Synthetic Aperture Radar
16.05.2006 - 18.05.2006 in Dresden, Germany

Tagungsband: EUSAR 2006

Seiten: 4Sprache: EnglischTyp: PDF

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Wang, Wenqin; Liang, Xingdong; Ding, Chibiao; Wang, Yanping; Hong, Wen (National Key Laboratory of Microwave Imaging Technology, Institute of Electronics, Chinese Academy of Sciences, P. R. China)
Wang, Wenqin (University of Graduate, Chinese Academy of Sciences, No. 19, BeiSiHuanXiLu, Beijing, 100080, P. R. China)

The requirements imposed on bistatic SAR systems have increased steadily. Directly associated with these requirements one has to solve the problem of highly accurate time and phase synchronization. This paper concentrates on the oscillator frequency instability between bistatic transmitter and receiver. An analytical model of phase noise is presented, in which Gauss noise is used as the input of a hypothetical low-pass filter and its output is considered as phase noise. Simulated results show that oscillator frequency instability may not only defocus the SAR image, but also introduce significant positioning errors along the scene extension. To obtain focused bistatic SAR image, phase synchronization must be ensured. Then one method of phase synchronization is presented, in which we use the direct-path echo as one reference signal to compensate the phase error caused by oscillator frequency instability. Finally, some recommendations for future work are given.