作者
Jianlai Chen, Mengdao Xing, Guang-Cai Sun, Yuexin Gao, Wenkang Liu, Liang Guo, Yang Lan
发表日期
2018/4/11
期刊
IEEE Transactions on Geoscience and Remote Sensing
卷号
56
期号
7
页码范围
3963-3975
出版商
IEEE
简介
The available focusing algorithms for medium-Earth-orbit (MEO) SAR are all based on the complex nonhyperbolic range equation, which may make it more difficult in imaging processing. In this paper, we model the range equation as the standard hyperbolic form based on the motion compensation (MOCO) principle. However, the conventional two-step MOCO may introduce azimuth spectrum expansion due to the potential large motion error, which can lead to severe azimuth ambiguity. To resolve this problem, we develop an omega-K algorithm based on a modified two-step MOCO and an adaptively straight equivalent (ASE)-velocity model. The algorithm is implemented through three-step processing: 1) the modified two-step MOCO does not compensate for the quadratic motion error (the main factor for the spectrum expansion); 2) an ASE-velocity model is introduced to compensate for the quadratic motion error …
引用总数
20192020202120225354
学术搜索中的文章
J Chen, M Xing, GC Sun, Y Gao, W Liu, L Guo, Y Lan - IEEE Transactions on Geoscience and Remote …, 2018