Z powrotem

GPS Přetečení čísla týdne

Dear customers, 

In the past, you may have ordered one or more Trimble modules or system level products. With this, we want to bring to your attention an upcoming event that could affect the performance of your GPS devices.

On April 6, 2019 there will be a GPS rollover that could affect all GPS / Timing units in the world, regardless of manufacturer.


The Background
In addition to providing an accurate location information, the Global Positioning System provides accurate timing information to many critical systems – power grid, communications, financial markets, emergency services, and industrial control to name a few. It also includes the ability to transmit the proper date and time to a receiver by supplying the receiver with the current week and the current number of seconds into the week. This allows the receiver to translate the date and time into a more typical format – day, month, year, and time of day.

However, the field from the Satellite system that contains the week number is a 10-bit binary number. This limits the range of the week number to 0 – 1023, or 1024 total weeks.

GPS week zero started January 6, 1980. The 1024 weeks counter ran out and rolled over on August 21, 1999. The week counter then reset to zero, and it has been recounting ever since. The next time the counter will reach week 1023 and rollover to zero is on April 6, 2019.

April 6, 2019 is the 1024th week and unless a GPS module or application has already accounted for this, the date may not report accurately. If the application does not use the date or if there are other sources for the date outside of the GPS module, you may not be affected.

Which GPS Units are affected?
Below is a partial list ofTrimble GPS modules with part numbers and names.  The units that have the potential to be affected by the April 6 WNRO Event have a star (*) beside it.  Not all products will have the same WNRO date.  Even if your product is not affected by the imminent WNRO Event, all products have a WNRO date.  Please use the below links to review the bulletin of your particular product for full information.

Note:  Position data (lat, lon), velocity and PPS will continue as normal and will not be effected. Only the week number will be affected.  The actual time should not be affected. The Week Number problem just affects the calculated date.  Therefore, the roll over event should only affect the UTC date.  The position output will not be effected.


Product Number
Product Description
incl. Bulletin Link
Potentially Affected
by April 6, 2019 WNRO
46240-00
Lassen SQ
*
46240-05
Lassen SQ
*
46240-20
Lassen iQ


46240-25
Lassen iQ


38116-20
Lassen SK8 II
*
38116-25
Lassen SK8 II


39263-00
Lassen LP
*
39263-10
Lassen LP


39263-15
Lassen LP


36916-00
Ace III


38223-61
Thunderbolt
*
39448-61
Thunderbolt
*
48050-61
Thunderbolt II
*
58048-00
Copernicus
*
58048-10
Copernicus
*
58048-20
Copernicus
*
58048-30
Copernicus
*
63530-00
Copernicus II
*
63530-10
Copernicus II
*
63530-50
Copernicus II
*
67415-00
Copernicus IIA
*
68674-00
Condor C1011
*
68674-05
Condor C1011
*
68674-10
Condor C1011
*
68676-10
Condor C1216
*
68676-20
Condor C1216
*
68675-00
Condor C1722
*
67650-10
Condor C1919A
*
67650-20
Condor C1919C
*
70896-00
Condor C2626
*
68677-05
Silvana with C1919A
*
68677-55
Anapala with C1919A
*
80300-07
TM3000
*
80300-08
TM3000
*
80300-28
TM3000
*
80300-77
TM3000
*
80300-78
TM3000
*
52664-05
Resolution T


52664-15
Resolution T


66266-00
Res SMT


66266-05
Res SMT


77766-00
ICM SMT


99899-00
Res SMTx


39091-00
Acutime 2000


39091-20
Acutime 2000


55238-00
Acutime Gold


97975-05
Res SMT 360


96975-00
ICM 360


106406-00/05
Acutime 360


89999-00
Res GG


92626-00/05
Acutime GG


95959-00
Mini T GG


60333-30
Thunderbolt E


60333-50
Thunderbolt E



How to Fix?
Please review the bulletin for the particular module that you use.  For some devices, there is a fw upgrade that will allow your device to continue normal operation beyond the WNRO date.  Most Condor family devices have fw updates available to download. Unfortunately, some modules will not have a fw update available.

In lieu of a fw update to the GPS device itself, the customer may wish to update their fw on their end product to accommodate for the week number change from the GPS module.  Additionally if the end product is connected over the air to a backend....the fw on the backend application can be modified to accommodate for the week number change.

Should you wish to change your host fw on your device or backend to detect and correct the date......sample source code and instructions can be found here.






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Hotline: 599 509 599

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