Bulletin des sciences géographiques de l'INCT
Volume 13, Numéro 2, Pages 2-8
2009-11-30

Satellite Laser Ranging Mobile Station : Presentation And Geodetic Applications



Authors : Gourine B . Kahlouche S . Ghezali B . Taibi H .

Abstract

The present work is subscribed in the framework of cooperation in space geodesy domain between the Centre des Techniques Spatiales (CTS, Algeria) and the observatory of the Azure coast (GEMINI/OCA, France). The paper deals With the presentation of the French Transportable Laser Ranging Station (FTLRS) and its experiences of geographie positioning at Corsica (France). The geodetic site of Ajaccio in Corsica is the main calibration site of satellite altimeters in the Mediter­ ranean area. It has been developed for altimetric missions such as TOPEX/Poseidon (T/P, 992), Jason-1 (2001) and Envisat (2002). The FTLRS was deployed there during t\vo laser campaigns, at 2002 and 2005. Here, we present the computation of the two sets of geocentric coordinates from the FTLRS range data acquired in the two Campaigns mainly on the lovv Earth geodetic satellites: Starlette and Stella (altitude of 800 km). The paper summarizes the different steps of the laser data processing. The average arcs RMS (Root Mean Square) obtained are about 1-2 cm for Lageos-1, Lageos-2, Starlette and Stella satellites; it is showed that best results of satellite orbits determination and geocentric positioning are obtained with Eigen-Grace03s gravity model. The difference of FTLRS absolute 3D positioning, between 2002 and 2005, of about 7.7 mm (i.e., 2.6 mm/yr) is less than residual en•ors of TRF2005 velocities (of about 4.3 mm/yr). Finally, sorne suggestions of the use of FTLRS in Algeiia for geodetic applications are made.

Keywords

French Transportable Laser Ranging Station (FTLRS), Positioning, Stability, Satellite Laser Ranging (SLR), Earth gravity field model.

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