![]() One of the things that makes this issue different from the Millennium Bug is that the impact won’t necessarily be felt on rollover day itself. Problems could occur on or after 6 April 2019 That means from that date onwards, we are likely to start seeing rollover problems in GPS receivers that aren’t programmed to cope with the week number reset. We are now nearing the end of the second epoch, which will fall on the 6 April 2019. The first GPS satellites went live on 6 January 1980, meaning that the first epoch of GPS time lasted until 21 August 1999. GPS used a 10 bit field to encode the week number in each GPS time message, which means that a maximum of 1,024 weeks (19.7 years), could be handled. Each of these periods is known in GPS terms as an “epoch”.Īt the end of each epoch of 1,024 weeks, the receiver resets the week number to zero and starts counting again. ![]() The Week Rollover Problem is a known issue caused by the way that GPS used to handle the week element of the data that forms an essential part of the navigation signal. The good news is, it’s easy to check now whether your receivers are affected or not, giving plenty of time to implement a solution.īut first, let’s look at what’s causing the problem. Similar – but different – to the Millennium BugĪs we’ll see, it’s not quite the Millennium Bug for GPS receivers, but it does share some similarities. (To give just one example, GPS trackers employed in a fleet management system to track deliveries could cause system errors or even a crash if they suddenly start to output location data timestamped with a date 20 years in the past.) But it will create week, month and year timestamps that are wildly wrong, which could seriously impact any systems and applications that rely on GPS data at that level. This won’t affect the receiver’s ability to navigate and/or calculate precise time from the day level down to the microsecond level. The data they output may suddenly jump backwards in time, putting timestamps on your timing and navigation data that are nearly 20 years out of date. If they are, you may find your receivers start to behave strangely on – or more likely at some point after – 6 April 2019. If your vehicles or equipment rely on GPS receivers, now is the time to check if they’re affected by the GPS Week Number Rollover issue. Here’s what that means and how to check if a receiver is vulnerable. Please feel feel free to contact us on should you require any additional information or clarification.Some GPS receivers may malfunction on or after 6 April 2019 due to the GPS Week Rollover. It is possible to support in August 2025 with this software to be released. For the software update, the corresponding cost will be charged. *5: For more information, and countermeasures, please contact us. ![]() Notice and countermeasures are same as this. *4: Next rollover of KE51719 and after will be May 2022. *3: Next rollover of KE50479 and after will be May 2022. *2: Next rollover of KE54239 and after will be May 2022. *1: Next rollover of BB51401 and after will be August 2025. Note that time and date will go back to the starting date (December 19, 1999) when a master-reset of equipment or a battery replacement is carried out after rollover day. notice and countermeasures below or click here to download the file. The subject models are designed to turn the clock back 19.6 years (December 19, 1999), and will continue to work incorrectly under normal use, however there is no influence on positioning operation.įor details, please see the 2. JRC announces measures for GPS week number rollover for equipment that is to occur on some of the GPS' on 4th August 2019. Due to this inaccurate date, the positioning operation may temporarily become unstable or be interrupted.All dated data output by equipment date back to 19.6 years ago.Date displayed dates back to 19.6 years ago (19 December 1999).When GPS week number rollover occurs, our GPS navigator and or sensor may show the following erroneous phenomena: Therefore, when 19.6 years have passed from the reference date in the systems, the clock time incorporated in GPS sensors and navigators will be reset, causing as a result errors in display or output of date or unstable occurrence in positioning operation. The GPS week number rollover occurs every 1,024 weeks which means about once every 19.6 years. This is called “GPS week number rollover”. After week 1,023, the week number count is reset to zero. The GPS system calculates time by counting the number of weeks up to a maximum of 1,023 weeks. This newsletter contains information in regard to the "GPS week number rollover" and how this affects JRC's GPS receivers and the GPS incorporated equipment.
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