Although we cannot always control or precisely simulate how a GPS satellite will perform during an actual WNRO event, this proactive approach is designed to ensure any impacted products have firmware updates in place to address the GPS rollover event and avoid any potential interruptions in connectivity.
Trimble continuously performs testing and analysis on its products, simulating anticipated WNRO events and circumstances prior to actual events.
GPS WEEK NUMBER ROLLOVER SOFTWARE
These are comprised of hundreds of GPS products with thousands of versions of software and firmware that are subject to frequent change. Since starting business in 1978, Trimble has shipped millions of GPS units. Trimble’s Approach to GPS Rollover Events Each product and GPS receiver, modem or module must be identified to determine whether a WNRO issue exists and, if so, what its rollover date is. While the official GPS WNRO event occurred in April 2020, the actual rollover date is dependent on the GPS receiver software. The first of these events occurred in 1999 and we experienced our second rollover event in early 2020. A GPS receiver that does not have compliant firmware may experience errors. The GPS Week Number Rollover (WNRO) event requires special testing and validation using simulation techniques to ensure that it is properly handled by GPS receivers. It all has to do with GPS satellites, which transmit signals that use a 10-bit binary counter to represent the GPS Week Number, a key piece of the date and time information.Įvery 19.7 years, this week number counter reaches its limit and rolls back to zero. So, what exactly is a GPS rollover event? These events can result in lost connectivity, missing data, and plenty of headaches. There has been some recent buzz in the transportation industry about certain telematics devices potentially being impacted by a GPS rollover event.
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