EIGEN-1S is a satellite-only gravity field model including 88 days of CHAMP data. The model is a combination of

• GRIM5-1S normal equation system
  More can be found on the section 1.3 webpages
• Lageos-1,-2, Starlette derived constraints on zonals
• additional Lageos-1,-2, Starlette and Stella laser tracking data (year 2000)
• CHAMP GPS satellite-to-satellite tracking data: 88days within the periods 2000, July 30 - Aug. 10, and Sept. 24 - Dec. 31 (accelerometry used for surface force reduction)

Please note: although higher degree/order terms are solved in EIGEN-1S, the solution has got full power only up to about degree/order 35, which is typical for a satellite-only solution. Higher degree/order terms are solvable applying stochastic a priori information according to a degree variance model (regularization of the normal equation system).

The EIGEN-1S data set

• contains fully normalized spherical harmonic coefficients complete to degree/order 100 with higher degree terms up to maximum degree 119 for CHAMP sensitive and resonant orders
• permanent tide is not included in C(2,0)
• C(0,0) and degree 1 terms are not solved
• DOT-terms (C(2,0) to C(4,0)) represent drifts per year, epoch for corresponding static terms: 1997.0
• standard deviations are given along with the coefficients. The standard deviations were posteriori calibrated applying a degree dependent calibration factor (cf. header of EIGEN-1S data set)
• The EIGEN-1S correlation matrix of the spherical harmonic coefficients is available as a CHAMP OG Level 4 product through the CHAMP Information System and Data Centre (ISDC)
• the formats are described on the CHAMP web pages (op.gfz-potsdam.de/champ) under 'Online Available Documents' in the document 'CHAMP gravity field solution data formats'.

 

 

from:http://www.gfz-potsdam.de/pb1/op/champ/results/index_RESULTS.html

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