一种用于宽带机载SAR的空变相位误差补偿算法
doi: 10.3724/SP.J.1146.2006.00256
A New Approach to Compensating Spatially Variant Phase Error in Airborne Wideband SAR
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摘要: 该文提出了一种用于机载合成孔径雷达(SAR)的方位向空变相位误差补偿算法。传统的机载SAR运动补偿技术只补偿方位向相位误差的空不变分量，而常常忽略空变分量。对于高分辨率宽带SAR，传统的运动补偿算法由于没有补偿空变相位误差，不能满足分辨率要求。该文提出的子孔径算法通过在距离-多普勒域将SAR数据分为若干子孔径，每个子孔径数据进行单独的相位误差补偿，从而实现了空变相位误差的补偿。在传统的运动补偿处理中嵌入该算法可以大大提高SAR图像方位向分辨率。
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关键词:
- 合成孔径雷达;运动补偿;空变相位误差
Abstract: A new motion compensation algorithm dealing with spatially variant phase error in azimuth direction is purposed in this article. Traditionally, only the spatially invariant part of phase error can be compensated and the residual spatially variant part is ignored. It is essential to compensate the spatially variant part of phase error in the high resolution wideband SAR. The new algorithm purposed in this article manages this part of phase error by splitting the SAR data to several sub-apertures in range-Doppler domain and compensates the spatially variant phase error respectively. The azimuth resolution is enhanced when the new algorithm is embedded into the traditional motion compensation algorithm. -
Eichel P H, Ghiglia D C, and Jakowatz C V Jr. Speckle processing method for synthetic-aperture-radar phase correction[J].Optical Letters.1989, 14(1):1-3[2]Fornaro G. Trajectory deviations in airborne SAR: Analysis and compensation[J].IEEE Trans. on Aerospace and Electronic Systems.1999, 35(3):997-1009[3]Kirk D R and Maloney R P. Impact of platform motion on wide-angle synthetic aperture radar(SAR) image quality. Proceedings of the 1999 IEEE Radar Conference, Waltham, April 1999: 20-22.[4]Carrara W, Tummala S, and Goodman R. Motion compensation algorithm for wide beam stripmap SAR. Proceedings of the SPIE, Orlando FL, April 1995, 2487: 13-23.[5]张澄波. 综合孔径雷达原理、系统分析与应用.北京：科学出版社，1989, 第4章. -
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