Canberra, Australia Assessing Tracking Performance of High Satellites at Mt Stromlo SLR Station Chris Moore.

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Presentation transcript:

Canberra, Australia Assessing Tracking Performance of High Satellites at Mt Stromlo SLR Station Chris Moore

Background Recent Changes to Mt Stromlo SLR Station –June/July 2007 – Laser power upgraded from approx 400 to 1200 mW. Pulse energy increased from approx 13 to 20 mJ and fire rate from approx 30 to 60Hz. Provide an Objective Analysis of Results of the Upgrade on Productivity –using Giove A tracking data. –using other HEO (Etalon, Glonass) tracking statistics. –using average productivities for all satellites –using geostationary satellite tracking.

Performance Factors Primary changes in performance expected to result from increase in laser power, but assessment is affected by other factors including; Changed operational mode – before the upgrade tracking was operator (manual) control with no dome window. After the upgrade, tracking has been automatic through a glass dome window. Coude mirror replacement – Most mirrors in the coude path were replaced after the upgrade (coatings had significant degradation). Effects of weather – A very significant period of overcast weather experienced in months after the upgrade. Changed tracking priorities – fewer Giove A tracking periods to accommodate Giove B, Etalon, Glonass, ETS8 etc. passes.

Conclusions Significant improvement in LEO productivity following laser power upgrade. HEO and Lageos productivity levels maintained, despite dome window in path and auto-tracking.