基于两维空变滤波的PFA波前弯曲误差补偿
收稿日期: 2014-02-24
修回日期: 2014-09-28
网络出版日期: 2014-10-10
基金资助
国家自然科学基金(61301210);江苏省自然科学基金(BK20130815);教育部博士点基金(20123218120021)
Polar format algorithm wavefront curvature error compensation using 2D space-variant post-filtering
Received date: 2014-02-24
Revised date: 2014-09-28
Online published: 2014-10-10
Supported by
National Natural Science Foundation of China (61301210); Natural Science Foundation of Jiangsu Province (BK20130815); Ph. D. Programs Foundation of Ministry of Education of China (20123218120021)
丁岚 , 毛新华 , 朱岱寅 . 基于两维空变滤波的PFA波前弯曲误差补偿[J]. 航空学报, 2015 , 36(2) : 605 -613 . DOI: 10.7527/S1000-6893.2014.0272
The space-variant defocus effect introduced by wavefront curvature error in polar format algorithm (PFA) imagery limits its maximal focused scene size. Space-variant post-filtering (SVPF) is an efficient approach to compensate for this error. However, to simplify the analysis, all the existing SVPF methods take some approximation on the wavefront curvature error. They can still not meet the required precision when imaging large area with very high resolution. In this paper, we provide a new analytical interpretation of polar format algorithm and develop the accurate wavefront curvature expression in 2D spatial frequency domain. Base on this accurate expression, a 2D SVPF is proposed to accurately correct the wavefront curvature error. Finally, simulation experiment validates the theoretical analysis.
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