Spectra Geospatial GNSS Receivers and GPS Week Number Rollover - April 2019

GPS provides a current date and time, represented as a week number. The week number parameter is generated via a 10-bit binary number. The valid range for the week number parameter is 0 to 1,023, for a total of 1,024 weeks. After that time, the week number rolls over to 0. The first week number period started when GPS was launched in January 1980, and the last GPS WNRO was 19.7 years ago, on Aug. 21, 1999. The next WNRO occurs on April 6, 2019, when the week number will again reach the maximum value of 1,023 and roll over to 0.

Any GNSS receiver that does not account for this rollover will report an erroneous date. This is an urgent required action and receivers will not function correctly without the correct firmware.

Gamintojas