相位梯度自聚焦在FFBP聚束SAR处理中的应用

doi:10.3969/j.issn.1001-2400.2014.03.005

J4 ›› 2014, Vol. 41 ›› Issue (3): 26-32.doi: 10.3969/j.issn.1001-2400.2014.03.005

相位梯度自聚焦在FFBP聚束SAR处理中的应用

李浩林;陈露露;张磊;邢孟道;保铮

(西安电子科技大学雷达信号处理国家重点实验室，陕西西安 710071)

收稿日期:2013-06-07 出版日期:2014-06-20 发布日期:2014-07-10
通讯作者: 李浩林
作者简介:李浩林(1987-)，男，西安电子科技大学博士研究生，E-mail: lihaolin322@163.com．
基金资助:
国家自然科学基金优秀青年基金项目资助(61222108)

Phase gradient autofocus within FFBP flow for spotlight SAR processing

LI Haolin;CHEN Lulu;ZHANG Lei;XING Mengdao;BAO Zheng

(National Key Lab. of Radar Signal Processing, Xidian Univ., Xi'an 710071， China)

Received:2013-06-07 Online:2014-06-20 Published:2014-07-10
Contact: LI Haolin

摘要/Abstract

摘要：

基于孔径分解和图像递归融合的快速分解后向投影算法具备接近频域算法的运算复杂度和媲美后向投影算法的聚焦性能．与频域成像算法不同，使用快速分解后向投影算法重建的直角坐标系图像或极坐标系图像均无法满足传统自聚焦方法的使用条件．为了解决这个问题，在原快速分解后向投影算法的基础上创新地引入了虚拟极坐标系，提出了改进快速分解后向投影算法，为自聚焦处理提供图像域与距离压缩相位历程域之间的傅里叶变换对关系．其次，建立全新的重叠子孔径构型，提出了嵌套多孔径相位梯度自聚焦的改进快速分解后向投影算法．最后，利用X波段聚束合成孔径雷达实测数据对该方法进行了验证．

关键词: 改进快速分解后向投影, 虚拟极坐标系, 傅里叶变换对, 相位梯度自聚焦, 运动补偿

Abstract:

Fast Factorized Back-Projection (FFBP) is an effective algorithm constructed based on aperture factorization. It is shown that the image quality is barely sacrificed compared with Back-Projection (BP). Different from frequency domain algorithms, SAR images reconstructed by FFBP cannot satisfy the requirement of autofocus. To solve this problem, we propose an improved FFBP (IFFBP) by introducing a fire-new coordinate system in this paper. Then, IFFBP can provide autofocus with Fourier transform pairs (FTP) between the image domain and the range compressed phase history domain. With a different framework of the overlapped subaperture in different stages, phase gradient autofocus (PGA) can be embedded into IFFBP to obtain a robust estimation of the phase error. Finally, the processed results of the collected data set validate this approach in spotlight SAR imagery.

Key words: fast factorized back-projection (IFFBP), pseudopolar coordinates, Fourier transform pairs, phase gradient autofocus, motion compensation

李浩林;陈露露;张磊;邢孟道;保铮. 相位梯度自聚焦在FFBP聚束SAR处理中的应用[J]. J4, 2014, 41(3): 26-32.

LI Haolin;CHEN Lulu;ZHANG Lei;XING Mengdao;BAO Zheng. Phase gradient autofocus within FFBP flow for spotlight SAR processing[J]. J4, 2014, 41(3): 26-32.

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相位梯度自聚焦在FFBP聚束SAR处理中的应用

Phase gradient autofocus within FFBP flow for spotlight SAR processing

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