G05 GNSS++: Emerging Technologies and Applications

IAG (Geodesy)

25-Jun-2015, 15:00 - 16:30

Abstract content:

Validation of GNSS orbits using satellite laser ranging data

The Center for Orbit Determination in Europe (CODE) is a global analysis center of the International GNSS Service (IGS) regularly delivering products such as precise satellite orbits, station coordinates, Earth rotation parameters, as well as satellite and receiver clock corrections based on a rigorously combined GPS and GLONASS processing. Starting from January 4, 2015, the operational CODE orbit products are based on an extended version of the Empirical CODE Orbit Model (ECOM): additional harmonic terms for the direct solar radiation pressure component were added and the angular argument for the harmonic terms was modified. The new model noticeably reduces spurious effects resulting from deficiencies in the solar radiation pressure modeling. Prior to that extension, ECOM was used for the IGS-style processing for many years. Using the new ECOM we reprocess the CODE product series. In this context additional experiments for the further improvement of the GNSS orbit modelling are planned. In this contribution we quantify the impact on the computed GNSS orbits. Since all GLONASS and two GPS satellites are equipped with corner cube reflector arrays dedicated to Satellite Laser Ranging (SLR), SLR is a powerful tool to validate microwave-based GNSS orbits. The discrepancy between the GNSS orbits and the laser distances (residuals) may serve as an indicator for the radial accuracy of the computed GNSS orbits.

A. Maier1, A. Susnik1, D. Arnold1, K. Sosnica1, R. Dach1, A. Jäggi1.
1University of Bern, Astronomical Institute, Bern, Switzerland.


GNSS     SLR     Orbit Validation     CODE     ECOM