作者
Guang-Cai Sun, Jixiang Xiang, Yong Wang, Zijing Zhang, Jun Yang, Mengdao Xing, Min Bao, Zheng Bao
发表日期
2021/1/5
期刊
IEEE Transactions on Geoscience and Remote Sensing
卷号
60
页码范围
1-14
出版商
IEEE
简介
Multiple azimuth channels (MACs) synthetic aperture radar (SAR) can theoretically achieve high azimuth resolution and wide swath (HRWS). Nevertheless, in practice, channel mismatch will lead to ghost or azimuth ambiguities, which will degrade the imaging quality. This article proposes a novel idea for estimating the channel mismatch of MACs SAR in the image domain. First, we found that the degree of freedom (DOF) of MACs signals doubles after signal reconstruction and imaging. As a result, when the channel number is not great enough, the subspace method for error estimation is unable to be implemented. To deal with this problem, we introduce a DOF compression method based on spectral filtering. This method can decrease the image-domain DOF. Finally, an image-domain subspace method is proposed to estimate the channel phase error, using the focused data and selecting the high SNR region of …
引用总数
学术搜索中的文章
GC Sun, J Xiang, Y Wang, Z Zhang, J Yang, M Xing… - IEEE Transactions on Geoscience and Remote …, 2021