Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pshao..21...45c&link_type=abstract
Publ. Shaanxi Astron. Obs., Vol. 21, No. 2, p. 45 - 48
Astronomy and Astrophysics
Astronomy
Clocks: Time Signals
Scientific paper
The relation between GPS system time and weeknumber is introduced, and it is explained that the limited number of (10 bits) used in the GPS navigation message causes the problem of GPS weeknumber rollover which is similar to that the millennium problem will occur when the year number becomes 00 from 99. The GPS weeknumber has the maximum of 1023 so that it will rollover from 1023 to 0 at the midnight of August 21 - 22, 1999. The GPS users should check if the receivers can work correctly once the "rollover" occurs. If the equipments or softwares for the GPS receiver are not perfect. The receiver will interpret the new week 0 as January 6, 1980, and some receivers may display wrong information or wrong locating results, even stop tracking any satellite. The GPS users should contact the manufacturer of the GPS receiver to determine if the GPS receiver will be affected by the GPS weeknumber rollover. It should be noted that the problem of time rollover often occurs for timing service.
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