Accuracy assessment and refinement of the JGM-2 and JGM-3 gravity fields for radial positioning of ERS-1 |
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| Authors: | P Moore S Ehlers S Carnochan |
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| Institution: | (1) Department of Civil Engineering, Aston University, Birmingham, B4 7ET, UK Tel.: +44 121 359 3611; fax: +44 121 333 3389; e-mail: moorep@aston.ac.uk, GB |
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| Abstract: | ERS-1 radial positioning using the JGM-2 and JGM-3 gravity fields is assessed by analysing dual crossovers with TOPEX/Poseidon,
neither field containing ERS-1 data. This method allows a more complete recovery of ERS-1 radial orbit error, specifically
of the previously unattainable mean geographical error. The global analysis shows that the theoretical error derived from
the JGM-2 covariance matrix is realistic and that JGM-3 represents a slight improvement, at least at the inclination of ERS-1.
A latitudinal-based study in the southern ocean indicates possible weaknesses in both fields, notably for low and resonant
geopotential orders m. A refinement of JGM-2, RGM-2, is undertaken through inclusion of ERS-1 and STELLA laser tracking and ERS-1 altimetry, reducing
several of its deficiencies.
Received: 14 May 1996 / Accepted: 17 February 1997 |
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| Keywords: | , JGM-2 and JGM-3 gravity fields,Dual crossovers,ERS-1-geographically correlated and anti-correlated errors, |
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