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Precise recovery of the Earth's gravitational field with GRACE; intersatellite range-rate interpolation approach
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|Authors:||Zheng Wei; Hsu Houtse; Zhong Min; Yun Meijuan|
|Author Affiliations:||Primary: |
Chinese Academy of Sciences, Institute of Geodesy and Geophysics, Key Laboratory of Dynamic Geodesy, Wuhan, China
Wuhan University of Science and Technology, China
|Volume Title:||IEEE Geoscience and Remote Sensing Letters|
|Source:||IEEE Geoscience and Remote Sensing Letters, 9(3), p.422-426. Publisher: Institute of Electrical and Electronics Engineers, Piscataway, NJ, United States. ISSN: 1545-598X|
|Note:||In English. Based on Publisher-supplied data. 15 refs.|
|Summary:||First, a new observation equation of a satellite from the intersatellite range-rate interpolation approach (IRRIA) is created by inserting the precise intersatellite range-rate measurements into the line-of-sight component of the orbital velocity difference vector. Second, by a comparison of the two-point, four-point, six-point, and eight-point interpolation formulas, the accuracy of the Earth's gravitational field is substantially improved using the six-point IRRIA formula due to an optimum signal-to-noise ratio. Third, a new Gravity Recovery and Climate Experiment (GRACE) satellite-only Earth gravity field model WHIGG-GEGM02S is produced by GRACE-Level-1B real data during the year 2009 using the IRRIA, and the cumulative geoid height error and cumulative gravity anomaly error are 1.140 ×10-1 m and 1.807 ×10-6 m/s2 at degree 120, respectively. Finally, the new WHIGG-GEGM02S model is much closer to the existing GGM02S model by a comparison of the root mean square of the geoid height differences between the global positioning system/leveling observations and the existing seven GRACE global gravity field models.|
|Subjects:||Global navigation satellite systems; Global Positioning System; GRACE; Gravity anomalies; Gravity field; Orbits; Remote sensing; Satellite methods|
|Copyright Information:||GeoRef, Copyright 2021 American Geosciences Institute.|
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