IMPORTANT NOTICE: GPS Week Number Rollover Deadline Approaching
As has been widely publicized throughout the geospatial industry, there is GPS Week Rollover scheduled for Saturday, April 6. Many of you have contacted Precision Midwest reps with concerns about GNSS equipment and its ability to handle the impending change. Trimble released the following statement earlier this year:
“A GPS week rollover will occur at the end of the GPS day on 6 April 2019, at which time the GPS week will transition from week 2047 to 2048. However, because the GPS message structure broadcast by the satellites defines the week as a 10-bit value, the GPS messages will indicate that the week has changed from 1023 to week 0.
Trimble has performed tests using a GNSS simulator to verify that the receiver firmware correctly handles the week rollover in different scenarios, including real-time kinematic and static surveys with various input and output messages, as well as data file format conversions.
To prepare for the week number rollover, it is recommended to install the latest receiver firmware version using Trimble Installation Manager for current products or Trimble WinFlash for legacy products. All Trimble receivers with firmware version >2.32 will continue to operate normally following the rollover.”
What Does This Mean for Trimble Users?
For users of recent Trimble GNSS receivers running firmware of 2.32 or greater, your GNSS equipment should operate as expected, based on tests conducted by Trimble. If you’re in doubt of your current firmware, please update to the most current version available at this time. For a list of available firmware updates consult the table below.
What Does This Mean for Spectra Precision Users?
Spectra Precisions users should install, at least, the firmware version applicable to their receiver, which is listed in our chart below. This MUST be done before the rollover date April 6, 2019. If you fail to do so, your receive will provide you with incorrect data, including GPS week number, UTC time, incorrect date in the output messages, data files and in the web user interface. Reliability of GNSS positioning will be negatively impacted in real-time mode and post-processing.
Do You Have Questions?
If you have any questions about any of the information listed above, please do not hesitate to contact the Precision Midwest Service Team or your rep. Call us today at (630) 836-1000.