Mathematics – Logic
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.340..231r&link_type=abstract
In ESA, Frequency and Time Forum p 231-238 (SEE N93-24978 09-70)
Mathematics
Logic
Atomic Clocks, Frequency Standards, Global Positioning System, Navstar Satellites, Rubidium, Standards, Aging (Materials), Crystal Oscillators, Electrical Engineering, Electronic Packaging, Frequency Stability, Radiation Hardening, Reliability, Temperature Control
Scientific paper
The design, improvements, test results, and progress of the Rubinium Atomic Frequency Standards (RAFS) for the GPS (Global Positioning System) Block 2R Navstar satellites are described. These satellites will replenish and upgrade the space segment of the GPS in the mid 1990's. The RAFS offer an aging rate in the low pp 10 to the 14th power/day range and a drift corrected 1 day stability in the low pp 10 to the 14th power range. The Block 2R version of these devices will have improved performance, higher reliability, smaller size, and greater radiation hardness. The GPS Block 2R atomic clocks have a 'natural frequency' configuration whereby they output a frequency of about 13.4 MHz that is a submultiple of the atomic resonance. The RAFS operate at a low fixed C field for increased stability. The unit was repackaged into a smaller 4.6 by 8.5 by 5.8 inch outline, but is somewhat heavier (12 lbs.) because of additional radiation shielding. Elimination of the ground tuning logic and the secondary loop synthesizer (with its ovenized crystal oscillator) reduced the RAFS complexity and improved its reliability to 0.80 for the 7.5 year mission. The RAFS power consumption is only 13 W at +20 C in vacuum.
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