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Potential of geosynchronous SAR interferometric measurements in estimating three-dimensional surface displacements

Potential of geosynchronous SAR interferometric measurements in estimating three-dimensional surface displacements
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摘要 The ability of differential interferometric synthetic aperture radar(DIn SAR) technology used for centimeter level deformation detection has been well-proved. Nevertheless, the applications of DIn SAR under the low Earth orbit(LEO) are limited to the line-of-sight(LOS) measurements, the limited observation area and the long revisited time. Geosynchronous SAR(GEO SAR), which runs in the height of 36000 km with the advantage of a short revisit time and a large observation area, is a potential approach to overcome the series problems in LEO SAR. This paper focuses on estimating three-dimensional(3D) displacements by using GEO SAR DIn SAR measurements acquired from multiple imaging geometries. Aiming to provide a normal solution for geologic hazard monitoring and relative geophysical application in the future, the errors induced by decorrelation noise, orbital ramp and ionospheric distortion are analyzed for the GEO SAR DIn SAR measurements. A series of experiments have been conducted to find the relationship between the 3D displacements and the DIn SAR observations which are provided with different noises and combinations of imaging geometries. The results reveal that 3D displacements can be expected from the combination of left-and right-looking GEO SAR DIn SAR measurements. In particular, the north-south solution can achieve centimeter and even millimeter level. The ability of differential interferometric synthetic aperture radar(DIn SAR) technology used for centimeter level deformation detection has been well-proved. Nevertheless, the applications of DIn SAR under the low Earth orbit(LEO) are limited to the line-of-sight(LOS) measurements, the limited observation area and the long revisited time. Geosynchronous SAR(GEO SAR), which runs in the height of 36000 km with the advantage of a short revisit time and a large observation area, is a potential approach to overcome the series problems in LEO SAR. This paper focuses on estimating three-dimensional(3D) displacements by using GEO SAR DIn SAR measurements acquired from multiple imaging geometries. Aiming to provide a normal solution for geologic hazard monitoring and relative geophysical application in the future, the errors induced by decorrelation noise, orbital ramp and ionospheric distortion are analyzed for the GEO SAR DIn SAR measurements. A series of experiments have been conducted to find the relationship between the 3D displacements and the DIn SAR observations which are provided with different noises and combinations of imaging geometries. The results reveal that 3D displacements can be expected from the combination of left-and right-looking GEO SAR DIn SAR measurements. In particular, the north-south solution can achieve centimeter and even millimeter level.
作者 Wanji ZHENG Jun HU Wei ZHANG Changjiang YANG Zhiwei LI Jianjun ZHU Zheng, Wanji[1]; Hu, Jun[1]; Zhang, Wei[2]; Yang, Changjiang[1]; Li, Zhiwei[1]; Zhu, Jianjun[1]
出处 《中国科学:信息科学(英文版)》 SCIE EI CSCD 2017年第6期44-57,共14页 SCIENCE CHINA Information Sciences
基金 supported by Advanced Project of Civil Aerospace Research of China: Earth Application and Key Technology Research of 20 m-Resolution Geosynchronous SAR Satellite,National Natural Science Foundation of China (Grant Nos. 41404011, 41674010) Major Projects of High Resolution Earth Observation (Civil Part) (Grant No. 03-Y20A11-9001-15/16) National Research Foundation for the Doctoral Program of Higher Education of China (Grant No. 20130162110015)
关键词 SAR干涉测量 地球同步轨道 位移估计 三维表面 合成孔径雷达 地质灾害监测 物理应用 相关噪声 GEOSAR, 3D displacements, DInSAR, IGSO, random error, systematic error
作者简介 Corresponding author (email: csuhujun@csu.edu.cn)
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