The World Positioning System time epoch is ending and one other one is starting, an occasion that would have an effect on your units or any tools or legacy system that depends on GPS for time and placement.
Most clocks acquire their time from Coordinated Common Time (UTC). However the atomic clocks on satellites are set to GPS time. The timing indicators you will get from GPS satellites are very correct and globally obtainable. And they also’re typically utilized by techniques as the first supply of time and frequency accuracy.
When World Positioning System was first applied, time and date operate was outlined by a 10-bit quantity. So in contrast to the Gregorian calendar, which makes use of yr, month and date format, the GPS date is a “week quantity,” or WN. The WN is transmitted as a 10-bit subject in navigation messages and rolls over or resets to zero each 1,024 weeks.
Since that point, the rely has been incremented by one every week, and broadcast as a part of the GPS message.
The GPS week began January 6, 1980 and it turned zero for the primary time midnight August 21, 1999. At midnight April 6, the GPS WN is scheduled to reset, which could possibly be problematic for legacy techniques and influence time and the time tags in location knowledge. Utilities and mobile networks additionally use GPs receivers for timing and controlling sure capabilities. As an example, the U.S. energy grid makes use of timestamps embedded in GPS. The U.S. Division of Vitality says that “GPS helps all kinds of crucial grid capabilities that permit separate parts on the electrical system to work in unison.”
It must be famous that the WN restart date could possibly be completely different in some units, relying on when the firmware was created.
The bug, which some has described because the Y2K of GPS, will trigger issues in some GPS receivers comparable to resetting the time and corrupting location knowledge. The GPS WN rollover occasion could damage the reliability of the reported UTC, in keeping with U.S. Division of Homeland Safety. HDS mentioned an GPS system that conforms to the newest IS-GPS-200 and offers UTC shouldn’t be adversely affected. The company additionally supplied a phrase of warning:
Nonetheless, assessments of some GPS units revealed that not all producer implementations accurately deal with the April 6, 2019 WN rollover. Moreover, some producer implementations interpret the WN parameter relative to a date apart from January 5, 1980. These units shouldn’t be affected by the WN rollover on April 6, 2019 however could expertise an analogous rollover occasion at a future date.
For those who personal a more moderen industrial system with up to date software program, it’s most probably advantageous. However double verify and ensure the software program is up-to-date.
The U.S. Naval Observatory suggests contact the producer of your GPS receiver when you have been effected by the GPS week quantity rollover. Some GPS receiver producers may be discovered on the GPS World web site.
Work has been performed to keep away from this type of rollover challenge — or a minimum of punt it down the road. The modernized GPS navigation message makes use of a 13-bit subject that repeats each 8,192 weeks.