Physics
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988bapl.rept.....g&link_type=abstract
Final Report British Aerospace Public Ltd. Co., Stevenage (England). Space and Communications Div.
Physics
Data Links, Multiple Access, Optical Communication, Satellite Networks, Spacecraft Communication, Tdr Satellites, Satellite Design, Satellite Tracking, Systems Engineering, Target Acquisition
Scientific paper
The feasibility of an optical implementation of a multiple access medium data rate data relay service on the timescale of Euro-DRS was assessed. The service requirements for the feasibility study are based on the service which, in existing or planned systems, is implemented at S band. The system should communicate simultaneously with up to 8 LEO users in orbits of radii up to 7400 km providing 8 independently agile links. On each link, it should communicate at up to 2Mb/sec, at bit error rates of 10 to the minus 6th power in the return direction (LEO to GEO). A design concept for the GEO central node was produced. Mass and power estimates were evaluated and a preliminary spacecraft accommodation study performed. The system weighs 130 kg and has a power consumption of 300 W. The optical subsystem occupies a 75 x 75 x 30 cm volume on the top floor of the spacecraft. A number of trade-offs were identified and performed in reaching the final system configuration. The system should have 1 telescope system per user, a periscope mirror configuration for coarse pointing, a single telescope for both transmit and receive, and the use of both 0.8 micron for the LEO-GEO link and 1.3 micron for GEO-LEO.
Grant Malcolm A.
Matthews N. F.
Robson Dave
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