- Title
- On computation of potential, gravity and gravity gradient from GRACE inter-satellite ranging data: a systematic study
- Creator
- Ghobadi-Far, K.; Han, S.-C.; Loomis, B. D.; Luthcke, S. B.
- Relation
- International Symposium on Advancing Geodesy in a Changing World. International Symposium on Advancing Geodesy in a Changing World: Proceedings of the IAG Scientific Assembly (Kobe, Japan 30 July-04 August, 2017) p. 91-96
- Publisher Link
- http://dx.doi.org/10.1007/1345_2018_39
- Publisher
- Springer Cham
- Resource Type
- conference paper
- Date
- 2019
- Description
- In situ gravimetric observables are computed from GRACE inter-satellite K-band ranging (KBR) and GPS measurements, along with non-gravitational accelerations. For time-variable gravity field analysis, residual KBR data could be directly used to approximate gravimetric observables. We study the systematic errors in approximating potential difference, line-of-sight (LOS) gravity difference and LOS gravity gradient with residual KBR data. Based on a simulation study, we show that the approximation errors are significant at the low frequency part of the gravity spectrum for all three observable types. The approximation errors remain below 10% of the signal for the potential difference, LOS gravity difference, and LOS gravity gradient, at frequencies >1 cycle-per-revolution (CPR), >7 CPR, and 7-40 CPR, respectively. Considering the actual error of residual KBR data, it is feasible to accurately compute the gravimetric observables directly from band-pass filtered residual range-rate and range-acceleration data, and employ them for analyses concerning the regional time-variable gravity field of the Earth such as continental hydrology.
- Subject
- GRACE; KBR; LOS gravity gradient; LOS gravity difference; potential difference
- Identifier
- http://hdl.handle.net/1959.13/1453277
- Identifier
- uon:44637
- Identifier
- ISBN:9783030129149
- Identifier
- ISSN:0939-9585
- Language
- eng
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