徐震等:On Signal Modeling of Moon-Based Synthetic Aperture Radar (SAR) Imaging of Earth
被阅读 258 次
2018-06-25
On Signal Modeling of Moon-Based Synthetic Aperture Radar (SAR) Imaging of Earth
作者:Xu, Z (Xu, Zhen)[ 1,2 ] ; Chen, KS (Chen, Kun-Shan)[ 1 ]
REMOTE SENSING
卷: 10  期: 3
文献号: 486
DOI: 10.3390/rs10030486
出版年: MAR 2018
文献类型:Article
 
摘要
The Moon-based Synthetic Aperture Radar (Moon-Based SAR), using the Moon as a platform, has a great potential to offer global-scale coverage of the earth's surface with a high revisit cycle and is able to meet the scientific requirements for climate change study. However, operating in the lunar orbit, Moon-Based SAR imaging is confined within a complex geometry of the Moon-Based SAR, Moon, and Earth, where both rotation and revolution have effects. The extremely long exposure time of Moon-Based SAR presents a curved moving trajectory and the protracted time-delay in propagation makes the "stop-and-go" assumption no longer valid. Consequently, the conventional SAR imaging technique is no longer valid for Moon-Based SAR. This paper develops a Moon-Based SAR theory in which a signal model is derived. The Doppler parameters in the context of lunar revolution with the removal of 'stop-and-go' assumption are first estimated, and then characteristics of Moon-Based SAR imaging's azimuthal resolution are analyzed. In addition, a signal model of Moon-Based SAR and its two-dimensional (2-D) spectrum are further derived. Numerical simulation using point targets validates the signal model and enables Doppler parameter estimation for image focusing.
 
通讯作者地址: Chen, KS (通讯作者)
Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China.
地址:
[ 1 ] Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China
[ 2 ] Univ Chinese Acad Sci, Beijing 100049, Peoples R China