多通道扫描辐射计行间错位的配准方法研究
投稿时间:2019-08-24  修订日期:2019-10-24  点此下载全文
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作者单位E-mail
李凯 中国科学院上海技术物理研究所 likai_sitp@163.com 
基金项目:中国科学院上海技术物理研究所创新专项
中文摘要:本文针对风云四号A星的多通道扫描辐射计(AGRI)出现的行间错位问题,提出解决方案。首先,根据AGRI的扫描方式结合傅里叶相移特性,计算错位行相邻像元相位差谱曲线;其次,通过最小二乘法拟合相位差谱的低频部分获取错位值;最后,利用“权重分配”的方式根据行间错位值对错位行进行重建,解决行间错位问题。本文对该方案进行了仿真实验验证,并对AGRI的在轨数据进行了处理。结果表明应用该方案的重建可以将错位值配准到一个像元以内,实现较好的行间配准结果。
中文关键词:行间配准,相位差谱,图像重建,AGRI图像,风云四号
 
Study on registration method of dislocation row for the advanced geosynchronous radiation imager
Abstract:In this paper, the solution to dislocation between adjacent rows is proposed for the advanced geosynchronous radiation imager (AGRI) of Fengyun-4A (FY-4A). Firstly, according to the scanning mode of AGRI combined with the shift theorem of the Fourier Transform, the phase difference curve of adjacent pixels in the misaligned row is calculated. Secondly, the displacement value is obtained by fitting the low frequency portion of the phase difference spectrum by the least squares method. Finally, the dislocation rows are reconstructed by means of “weight assignment” according to the displacement value, and the problem of dislocation between the rows is solved. The scheme proposed is verified by simulation experiment, and the in-orbit images of AGRI is processed. The results show that the proposed algorithm can achieve registration between adjacent rows with high precision on sub-pixel level.
keywords:registration between adjacent rows, phase difference spectrum, image reconstruction, AGRI image, Fengyun-4A
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