An automatic SLR normal point analysis service which operates on a daily basis has been set up within the NERC Space Geodesy Facility based on work done in collaboration with the Department of Satellite Geodesy, Austrian Academy of Sciences, Graz. This makes it possible to carry out quality checks on the measurements from the SLR community on a very short timescale. This service includes a check on the global set of LAGEOS-1, LAGEOS-2, ETALON-1 and ETALON-2 normal points via a long-arc solution plus a short-arc solution for the majority of SLR-tracked satellites.

A multi-day orbital arc is fitted to the global set of SLR observations, achieving a post-fit residual RMS typically of about 2 cm for LAGEOS and for ETALON. The range residual of each normal point from that fitted arc gives an indication of the precision of the normal point. The residuals for each station are plotted daily, those for Lageos-1 being shown in RED, for Lageos-2 in BLUE, for ETALON-1 in GREEN and for ETALON-2 in MAGENTA.
As well as this LAGEOS and ETALON long-arc analysis, a short-arc solution is carried out for a more extensive set of satellites for any arc tracked simultaneously by two or more of the CORE ILRS stations. This analysis is capable of identifying bias at the level of about 10mm, but it should be noted that any such deductions are subject to the quality of the station coordinates being used; as from 2001 April 4, coordinates are taken mainly from ITRF2000 and are not adjusted during these analyses. However, coordinate updates are computed when required; for example after significant motion following an Earthquake (e.q. near Arequipa, Peru on June 23, 2001).