数据采集与处理2017，Vol.32Issue(4)：776-784,9.DOI:10.16337/j.1004-9037.2017.04.015
一种斜视滑动聚束SAR子孔径处理成像方法
Imaging Method for Sub-aperture Processing for Squinted Sliding Spotlight SAR
摘要
Abstract
In the advantages of low memory requirement and high flexibility,sub-aperture method is effective in solving the problem of azimuth spectrum aliasing in sliding spotlight SAR imaging.Image quality and imaging efficiency are affected by sub-aperture partition.However,sub-aperture division usually relies on experience value,which cannot be given with a clear theory analysis at present.Therefore,spectrum gaps may appear in the squint imaging processing if sub-apertures are not properly divided.First,we introduce sliding spotlight SAR model and analyze its Doppler frequency history.A sub-aperture imaging algorithm for squinted sliding spotlight SAR is proposed based on azimuth frequency domain scaling.Then according to two-dimensional spectrum of the adjacent sub-apertures,we investigate the sub-aperture spectrum stitching principle and derive the two equations,thus determine sub-aperture length and overlap rate.Afterward the flow for partitioning sub-apertures is given.Finally,effectiveness of the sub-aperture partition method and squinted imaging algorithm is verified by simulation experiments and real data.关键词
滑动聚束SAR/频谱混叠/子孔径划分/斜视Key words
sliding spotlight SAR/spectrum aliasing/sub-aperture partition/squint分类
信息技术与安全科学引用本文复制引用
张劲东,陈家瑞,朱岱寅,邱晓燕,唐笑为..一种斜视滑动聚束SAR子孔径处理成像方法[J].数据采集与处理,2017,32(4):776-784,9.基金项目
中央高校基本业务费(NJ2016041)资助项目 （NJ2016041）
装备预研基金(6140413020116HK02001)资助项目. （6140413020116HK02001）
