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The GPS receivers used in these models are now obsolete. #Gps week number seriesThe tServe 5000 series models have been out of production for over 10 years. TimeTools recommends replacing these devices with new T-Series units. TimeTools s5000, s5100 and s5500 models have been out of production for over 10 years. However, TimeTools strongly recommends that the SR-SC Series firmware is kept up to date. Summary: No immediate action is required. #Gps week number serial numberThe receivers have a base week number derived from the firmware build date.Īll models up to serial number SR1443 (manufactured before April 2010) week number rollover: June 2025Īll models after serial number SR1443 (manufactured after April 2010) week number rollover: 29 December 2029. Legacy Models TimeTools SR, SC and LC Series Models Summary: No immediate action is required. However, TimeTools strongly recommends that the T-Series firmware is kept up to date. Currently, the week number of these devices will rollover on 9 August 2036. ![]() The beginning of the GPS week is offset from midnight UTC by the accumulated number of leap. #Gps week number softwareThe receivers have a software updatable base week to extend the week number. The Z count gives the current GPS week number (modulo-1024). ![]() TimeTools T100, T300 and T550 models utilize Trimble GPS and Multi-GNSS receivers. The next rollover event is due on 6th April 2019. The start date for the week number count was 6th January 1980. Therefore, every 1024 weeks, the week number rolls over to zero. On April 6, 2019the first Saturday in Aprilthe GPS week counter will reset to zero. That week counter uses 10 bits and needs to be reset every 1,024 weeksroughly every 20 years. The GPS system stores the current week number as a 10-bit number. What is the GPS Week Number Rollover GPS uses a week counter that enables receivers to calculate the appropriate date. #Gps week number freePlease feel feel free to contact us on should you require any additional information or clarification.On 6 April 2019 there will be a Global Positioning System (GPS) week number (WN) rollover on Coordinated Universal Time derived from GPS receivers and devices. 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. Unfortunately most GPS satellites send the GPS week number encoded in 10 bits only, covering a range of 1024 weeks (week numbers 0 through 1023), and after week 1023 the week number transmitted by the satellites rolls over to 0. *1: Next rollover of BB51401 and after will be August 2025. The GPS system time is based on week numbers since an epoch, and seconds of the current week. 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. #Gps week number downloadnotice 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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