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The GPS week number rollover is a phenomenon that happens every 1,024 weeks, which is about 19.6 years. The Global Positioning System (GPS) broadcasts a date, including a week number counter that is stored in only ten binary digits , whose range is therefore 0–1,023.
As opposed to the year, month, and day format of the Gregorian calendar, the GPS date is expressed as a week number and a seconds-into-week number. The week number is transmitted as a ten-bit field in the C/A and P(Y) navigation messages, and so it becomes zero again every 1,024 weeks (19.6 years). GPS week zero started at 00:00:00 UTC (00:00: ...
GPS time is expressed with a resolution of 1.5 seconds as a week number and a time of week count (TOW). [13] Its zero point (week 0, TOW 0) is defined to be 1980-01-06T00:00Z. The TOW count is a value ranging from 0 to 403,199 whose meaning is the number of 1.5 second periods elapsed since the beginning of the GPS week.
GPS dates are expressed as a week number and a day-of-week number, with the week number initially using a ten-bit value and modernised GPS navigation messages using a 13-bit field. Ten-bit systems would roll over every 1024 weeks (about 19.6 years) after Sunday 6 January 1980 (the GPS epoch ), and 13-bit systems roll over every 8192 weeks.
GPS counts weeks (a week is defined to start on Sunday) and 6 January is the first Sunday of 1980. [ 35 ] [ 36 ] Weeks are stored in a 10 bit integer, and the first GPS week number rollover occurred in August 1999.
This page was last edited on 7 February 2023, at 03:11 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
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Something like what exists at the top of Swatch Internet Time or at French Republican Calendar#Current_date_and_time would be nice, where the reader is informed of ISO weeks since the launch of GPS (which is what the GPS week number would be if stored in as many digits as necessary for it not to roll over) and below it, the current GPS week number (so the previous number modulo 1024).