On the 6th of April the transmitted GPS week number will rollover from 1023 to 0000.
What does that mean?
GPS Time is a uniformly counting time scale beginning at midnight on the 1/5/1980 to 1/6/1980. GPS Time counts in weeks and seconds of a week from this instant with the weeks beginning at the Saturday/Sunday transition. The days of the week are numbered, with Sunday being 0, 1 Monday, etc. This needs to be converted to Universal Time (or GMT).
GPS time is based on an 8-bit system and that means there’s only a limited number of digits and once we reach 1023 we need to roll back to 0000.
So it’s the Millennium Bug?… Do I need to know about this?
Probably not. Most GNSS manufacturers can simulate and test the effect of the addition of a leap second and can adjust their software if required. However, most will not test old versions of firmware as you should be keeping your kit up to date.
How have Leica Geosystems prepared for the change?
“The week rollover has been simulated using a GPS signal generator. Tests have been done with Leica Geosystems GNSS receivers introduced since 2004. This includes the System 1200, GPS900, Viva GNSS and GR/GM/GG product families. The latest firmware versions were installed in all tested receivers.
Based on the performed tests, we do not expect that the GPS week rollover will cause any issues regarding signal tracking, positioning or observation data logging.”
What if it all goes wrong?
Then contact your helpful Opti-cal support team using the hotline 01293 565 565 or drop us an email on firstname.lastname@example.org and we’ll see you right.