Space-Variant Filtering for Wavefront Curvature Correction in Polar Formatted Bistatic SAR Image

作者：Wang Xin^*; Zhu Daiyin; Mao Xinhua; Zhu Zhaoda

来源：IEEE Transactions on Aerospace and Electronic Systems, 2012, 48(2): 940-950.

DOI：10.1109/TAES.2012.6178040

An analytical expression of the phase error from wavefront curvature in bistatic spotlight-mode synthetic aperture radar (SAR) image reconstructed via polar format algorithm (PFA) is derived in this paper. The wavefront curvature effect, which arises from the unrealistic planar wavefront assumption in bistatic PFA, induces phase error terms resulting in space-variant geometry distortion and defocusing. Based on the analytical expression of the wavefront curvature error, a space-variant filtering approach is applied to compensate for it in the polar formatted bistatic SAR image. Analysis on the scene size limit after using the correction method indicates that the derived space-variant filter is capable of extending the focused scene size of bistatic PFA considerably. Point target (PT) simulation validates the approach.

• 出版日期2012-4
• 单位南京航空航天大学; 南京邮电大学