The World Positioning System time epoch is ending and one other one is starting, an occasion that would have an effect on your gadgets or any gear 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 alerts you will get from GPS satellites are very correct and globally out there. And they also’re typically utilized by techniques as the first supply of time and frequency accuracy.
When World Positioning System was first carried out, time and date perform 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 area in navigation messages and rolls over or resets to zero each 1,204 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 impression time and the time tags in location information. Utilities and mobile networks additionally use GPs receivers for timing and controlling sure capabilities. For example, the U.S. energy grid makes use of timestamps embedded in GPS. The U.S. Division of Power says that “GPS helps all kinds of vital grid capabilities that enable separate elements on the electrical system to work in unison.”
It must be famous that the WN restart date could possibly be totally different in some gadgets, 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 akin to resetting the time and corrupting location information. The GPS WN rollover occasion might harm the reliability of the reported UTC, in line with U.S. Division of Homeland Safety. HDS mentioned an GPS gadget that conforms to the newest IS-GPS-200 and supplies UTC shouldn’t be adversely affected. The company additionally offered a phrase of warning:
Nonetheless, assessments of some GPS gadgets revealed that not all producer implementations appropriately 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 gadgets shouldn’t be affected by the WN rollover on April 6, 2019 however might expertise an analogous rollover occasion at a future date.
Should you personal a more recent business gadget with up to date software program, it’s most probably wonderful. However double test and ensure the software program is up-to-date.
The U.S. Naval Observatory suggests contact the producer of your GPS receiver in case you have been effected by the GPS week quantity rollover. Some GPS receiver producers could be discovered on the GPS World web site.
Work has been finished to keep away from this sort of rollover concern — or not less than punt it down the road. The modernized GPS navigation message makes use of a 13-bit area that repeats each eight,192 weeks.