1. The Impact of Temporal Geopotential Variations on GPS
- Author
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Melachroinos, Stavros, Lemoine, Frank G, Zelensky, Nikita P, Beckley, Brian D, Chinn, Douglas S, Nicholas, Joseph B, McCarthy, John J, Pennington, Teresa, and Luthcke, Scott B
- Subjects
Space Sciences (General) - Abstract
Lemoine et al. (2006) and Lemoine et al. (2010) showed that applying more detailed models of time-variable gravity (TVG) improved the quality of the altimeter satellite orbits (e.g. TOPEX/Poseidon, Jason-1, Jason-2). This modeling include application of atmospheric gravity derived from 6-hrly pressure fields obtained from the ECMWF and annual gravity variations to degree & order 20x20 in spherical harmonics derived from GRACE data. This approach allowed the development of a consistent geophysical model for application to altimeter satellite orbit determination from 1993 to 2011. In addition, we have also evaluated the impact of TVG modeling on the POD of Jason-1 and Jason-2 by application of a weekly degree & order four gravity coefficient time series developed using data from ten SLR & DORIS-tracked satellites from 1993 to 2011 (Lemoine et al., 2011).
- Published
- 2012