| | Frequently Asked Questions: u-blox 5 FAQTopic 4 | When and what is the GPS week rollover problem and how will u-blox receivers behave? |
When and what is the GPS week rollover problem and how will u-blox receivers behave?
Background
GPS has its own date and time scale for expressing satellite positions, based on counting weeks, and seconds within a week. To limit the size of the numbers used in the data and calculations the GPS Week Number is a ten-bit count in the range 0-1023, repeating every 1024 weeks. Week 0 started at 00:00:00 UTC on Sunday, 6th January 1980, so the week number 'rolled over' from 1023 to 0 on Saturday, 21st August 1999. The next GPS week rollover from 1023 to 0 is going to occur on April 06, 2019.
Problem
The GPS Signal Spcification states it is up to the user equipment (i.e. the GPS receiver) to handle the week number rollovers correctly. The problem is that some GPS receivers may be confused by the rollover event, which is similar to the year-2000 software problems.
u-blox 5 GPS and GALILEO Receivers
u-blox 5 GPS and GALILEO receivers are designed and have been tested to correctly handle the next GPS week rollover on April 06, 2019.
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