1. School of Geosciences and Info-Physics, Central South University, Changsha 410083, Hunan, China
2. National Disaster Reduction Center, Ministry of Civil Affairs of the People's Republic of China, Beijing 100124, China
Corresponding author (email@example.com
The ability of differential interferometric synthetic aperture radar (DInSAR) technology used for centimeter level deformationdetection has been well-proved. Nevertheless, the applications ofDInSAR 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 theadvantage of a short revisit time and a large observation area, is apotential approach to overcome the series problems in LEO SAR. This paperfocuses on estimating three-dimensional (3D) displacements by using GEOSAR DInSAR measurements acquired from multiple imaging geometries. Aiming toprovide a normal solution for geologic hazard monitoring and relativegeophysical application in the future, the errors induced by decorrelationnoise, orbital ramp and ionospheric distortion are analyzed for the GEOSAR DInSAR measurements. A series of experiments have been conducted to findthe relationship between the 3D displacements and the DInSAR observationswhich are provided with different noises and combinations of imaginggeometries. The results reveal that 3D displacements can be expected fromthe combination of left- and right-looking GEO SAR DInSAR measurements. Inparticular, the north-south solution can achieve centimeter and evenmillimeter level.
This work was 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). The authors thank anonymous reviewers for their comments which greatly improve the quality of the manuscript.
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