Contribution of Helwan's laser ranging station in the international laser ranging services

Abstract

This paper introduces the main features of Helwan SLR and analysis date recorded by the station about tectonic motion and Earth sensing by monitoring the satellites Lageos-1 and Topex. The ranging precision of Helwan SLR station has been continually improved from the original value of several meters (when constructed in 1974) down to a centimeters.