Computer Science – Performance
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.340..125b&link_type=abstract
In ESA, Frequency and Time Forum p 125-136 (SEE N93-24978 09-70)
Computer Science
Performance
Beacons, Frequency Stability, Orbit Calculation, Oscillators, Position (Location), Satellite Instruments, French Space Program, Nasa Space Programs, Poseidon Satellite, Spot (French Satellite), Systems Engineering, Topex, Very Long Base Interferometry
Scientific paper
Elements of the DORIS (Doppler precise positioning System) performances and performances of the DORIS USO (Ultra Stable Oscillators) are described. The DORIS system was designed and developed to meet new needs in precision orbit determination and high accuracy beacon location. DORIS payload was integrated on three French SPOT satellites and on the Topex-Poseidon NASA satellite. The first model DORIS SPOT 2 began operating on 22 Jan. 1990. The fundamental measurement precision depends strongly on the stability of USO, which are used in the onboard receiver, and in ground location beacons.
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