Accession Number : ADP004571

Title :   Timing Accuracy of LF and TV Synchronization Techniques,

Corporate Author : SHAANXI ASTRONOMICAL OBSERVATORY (CHINA)

Personal Author(s) : Miao,Y. R. ; Pan,X. P. ; Luo,D. C. ; Zhuang,Q. X. ; Song,J. A.

Report Date : 02 APR 1984

Pagination or Media Count : 8

Abstract : Low frequency and television synchronization techniques have been widely used in China for several years. Shaanxi, Shanghai and Beijing Astronomical Observatories have cooperated with the U.S. Naval Observatory in making two portable clock calibration experiments in 1981 and 1982. The results indicate that the LF synchronization method can reach a timing accuracy of + or - 1 microseconds and a precision of + or - 0.05 microseconds to + or - 0.20 microseconds over a range of 2000km with complex mixed paths. In addition, it has been found that there is a systematic difference of about 4 microseconds between USNO and other laboratories via the North-West Pacific Loran-C chain. The experiment also shows that the timing accuracy for the passive TV synchronization method is about + or - 1 microseconds and the prevision of daily frequency calibrations is better than 2 parts in 10 to the 12th. (Author)

Descriptors :   *TIMELINESS, *SYNCHRONIZATION(ELECTRONICS), *ATOMIC CLOCKS, ACCURACY, LOW FREQUENCY, TELEVISION SYSTEMS, CALIBRATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE