Computer Science – Performance
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.340..297h&link_type=abstract
In ESA, Frequency and Time Forum p 297-300 (SEE N93-24978 09-70)
Computer Science
Performance
Crystal Oscillators, Frequency Stability, Frequency Standards, Spacecraft Electronic Equipment, Systems Engineering, Electromagnetic Noise, Frequency Measurement, Satellite Instruments, Specifications, Temperature Control
Scientific paper
An ultrastable 5 mHz reference oscillator performance specification and a list of satellites that use source ultrastable crystal oscillators are presented. The circuit design and physical package provides an output frequency noise of -145 dBc/Hz 10 Hz from carrier; short term frequency stability is better than 5 pp 10 to the 13th power/second; temperature coefficient is less than 2 pp 10 to the 12th power/C over the operating temperature -20 C to +50 C; vibration 'g' sensitivity less than 6 pp 10 to the 10th power/g; and long term frequency stability less than 5 pp 10 to the 12th power/day in the actual space environment. These precision oscillators have frequency update capability allowing them to be tuned from the ground by command. A built-up 12 bit D/A converter with either parallel or series command codes controls the oscillator frequency. This tuning ability enables the oscillator to remain at an accurate frequency for missions of 10 to 15 years. Radiation hardening protection is also incorporated as required.
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