Computer Science
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.340..309k&link_type=abstract
In ESA, Frequency and Time Forum p 309-313 (SEE N93-24978 09-70)
Computer Science
Crystal Oscillators, Drift Rate, Frequency Standards, Rubidium, Signal Analysis, Television Transmission, Algorithms, Frequency Control, Frequency Measurement, Frequency Stability, Synchronism
Scientific paper
The methods and results of using the 15625 Hz frame synchronizing frequency of a normal television (TV) broadcast as a reference to automatically stabilize a local rubidium oscillator are described. The characteristics of the Finnish TV network were studied. Consequently, TVCRO (TV Controlled Rubidium Oscillator) microcomputer control algorithms and TVCRO prototype hardware were designed. Prototype measurements showed that the daily frequency can be maintained within 5 x 10(exp -12) (peak to peak). The standard deviation around the mean value is 0.9 x 10(exp -12). During a 40 day test run, the TVCRO output phase was within 0.8 microseconds of the TV phase. The long term drift of the TVCRO is in the order of a few parts on 10(exp -13) per year when referenced to transmission center frequency.
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