Are You Ready For The GPS Week Rollover?

Are You Ready For The GPS Week Rollover?

From the U. S. Department of Energy’s Office of Electricity:

On April 6, 2019, there will be an event affecting the electric transmission and distribution system that has industry concerned about the potential for a major disruption.  During the Week Number rollover of the Global Positioning System (GPS), the week number that uses the 10-bit binary system will reach its limit of 1,024 weeks and will be forced to roll over and be reset to week 0.

For more details, please read this excellent article by Gavin Schrock, PLS at xyHt Magazine.

Wendell

Wendell

Wendell was a Land Surveyor for 26 years, then moved on to building websites for his second career. But he never lost sight of the surveying community and the other disciplines related to surveying. He's purposely stayed involved in the surveying industry because he has always been — and will continue to be — a Land Surveyor at heart.

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Shelby H. Griggs PLS
Member

I will let you know on April 7th!SHG

Eric Kara
Member

This is Leica’s response on there “Myworld” website. They have been affected by these rollovers in the past, so will be crossing my fingers at 12:01am.”GPS Week RolloverOccurring 6 April 2019, the transmitted GPS week number in the navigation message will rollover from 1023 to 0. All currently operational Leica Geosystems GNSS receivers will not be affected by this rollover.Nevertheless, to ensure the best possible performance, it is a good practise to use the latest firmware. Please refer to the myWorld portal or contact your local Leica Geosystems representative to obtain the latest firmware versions.”

gschrock
Member

Two more GPS Week related tech bulletins:   Spectra Trimble

antcrook
Member

Topcon also has a list of receivers that will get the firmware upgrade and which ones will not.

A Harris
Member

@ Mark SilverWill this affect Ashtech and ProMark series GPS units?

gschrock
Member

I have not been able to find anyone to comment on much of the legacy gear (of any type). And in most cases, when I get a hold of an engineer at (any of the) manufacturers, they were not working there when legacy models were more common. I’ll keep trying…

A Harris
Member

Hope my Promark 3s are not blow out of use by this.@Mark Silver, any knowledge about their use after the rollover?

Mark Silver
Member

I honestly don’t know, however I suspect that the PM3’s will fail. I also doubt new firmware will be made available for them. I also suspect that it will be possible to fix the errant RINEX with a software shim.
My semi-official responce can be found here: http://ymlp.com/zDSqbb  

george tsipas
Member

PROMARK 3 & GNSS SOLUTION
  I am a owner of a pair of promark 3 .
After the gps week rollover after I was download the data from rover and the base at the same time the program crash down ( the program don’t respond)
SOLUTION
STEP 1

CREATE NEW PROJECT (par example TEST 1)
DOWNLOAD OR IMPORT DATA FROM ONE UNIT ONLY (BASE OR ROVER)
IMPORT
EXIT FROM PROGRAM

STEP 2

RUN GNSS SOLUTION
OPEN EXISTING PROJECT (TEST 1)
DOWNLOAD OR IMPORT DATA FROM THE SECOND UNIT ONLY (BASE OR ROVER)
IMPORT
PROCCESS AND AJUST

All the static solutions are perfect.
GEORGE TSIPAS
CIVIL ENGINEER
XYLOKASTRO GREECE
Email:gtsipas@windowslive.com

toivo1037
Member

I did not see an issue with my old receivers (using for static work) on the last rollover.  Hoping that is the case again. I will be testing the following week for sure.

True Corner
Member

For TBC users won’t “Fix-Week” fix this latest rollover?

Mark Silver
Member

This is an URGENT NOTICE for users of the following GNSS receivers:ProFlex 500, ProFlex 800MobileMapper 100, 120ProMark 100, 120, 200, 220, 700, 800SP 20, 60, 80, 90mContinue reading [ https://ymlp.com/zDSqbb ]. The official Spectra Geospatial note is here [ http://trl.trimble.com/docushare/dsweb/Get/Document-905123/Spectra_SupportNote_GPS_Week2048.pdf ]

Mark O
Member

Mark,
 
My PM 220’s are not up to date, do I just run the .cab file? I’m a bit reluctant as I just bricked one trying to reload software. 

James Vianna
Member

From Marks article:
“it is my guess that the PM2/PM3 receivers will fail on rollover. In addition, I believe that the desktop tool ‘GNSS Solutions’ will probably also fail.”
It will be a bad day for me should this occur. Both the PM3 and GNSS Solutions have served me well over the years and produced some excellent static work for a next to nothing cost. They were a good tool for me to cut my teeth into GPS.
Now I know just enough to be dangerous, 😋 
Jim

Larry Scott
Member

If the date is wrong gnss will fail. Convert to rinex and fix the dates, download a broadcast eph. Import the edited rinex into gnss. 

Mark O
Member

Mark,

 

My PM 220’s are not up to date, do I just run the .cab file? I’m a bit reluctant as I just bricked one trying to reload software. 

Bryce
Member

Is it a safe bet that GNSS Solutions will be affected?

A Harris
Member

After 8in of rain thru 3days and nights ended, on Monday I was able to setup three PM3s in the back yard and only one needed updating and the one I use for rover needed reset.
All were reading 9 sats and knew where they were.
Will see in a week or so if they are collecting data and will load into GNSS Solutions.
GNSS Solutions has had me to process only one location at a time since some time last year.
Hoping it will still work………….. 🤔 

Mark Silver
Member

ProMark 100, 120, 200, 220 + MobileMapper 100, 120:Download the update file from the Trimble file source. Put it (as a .CAB file) on an SD card. The SD card should be 4GB or less so that the device can read it.                Link: http://trl.trimble.com/docushare/dsweb/Get/Document-907151/PM5_V2.5.aW215Hm27.CAB Make sure device battery is fully (or very nearly fully) charged.Turn on the device. Wait for it to fully boot.From the ‘File Explorer’ on the mobile device (NOT ON YOUR PC!) navigate to the card and then click on the .CAB file. The installer will auto-run. (You can find the ‘File Explorer’ under Start(flag), Programs then drag… Read more »

Siim Randveer
Member

Thank you very very much for this post! It helped me a lot! One device (I have a whole lot of Ashtechs and Spectras here to fix) still doesn´t want to go through the entire installation process. Could you please give me a clue what could go wrong? I think the process stops in the beginning of “GNSS Upload”…

Siim Randveer
Member

Now another Ashtech Promark100 has a same kind of problem. Although installation process seems to run smoothly finally I can´t choose a tracking mode in GNSS Toolbox anymore- “The current option is not available!”. I get messages like that “2.70 Bad parameter on port F” and “30.13 No GNSS detected”. It seems to be a problem related to older devices (Ashtechs Promark 100) because Spectra MobileMapper 120 are fine after firmware installation. Is there some things I can try to solve this problem? After the installation the GNSS Toolbox>About is like that:                GNSS Toolbox Version: 2.0.5                GNSS Service: Version 2.5.a               … Read more »

Siim Randveer
Member

Is it possible that firmware installation still doesn’t help my Ashtechs and Spectras? The first firmware installation I thought was successful turned out to be a failure. GNSS device showed a correct date and also the post-processing raw data file name had the right day and year numbers but nevertheless it was impossible to do the post-processing – the measurements start time was 20 years off…
Is it important that the firmware update was done after April 6th? Not all the GNSS devices doesn’ t have the latest software – is this the reason why installation fails?

David Livingstone
Member

I know one issue I have is upgrading the Firmware in my Hiper II’s.  I am running a couple of newer Rangers with my GPS and when I upgrade the firmware, they stop working.  It appears that after doing this in the past and having problems I would have to pay for an OAF file or Legacy file for the Hipers to make them work with the Rangers if I upgrade firmware.  I’m hoping to get by doing nothing.

spyropas
Member

I have PM500 with v4 firmware could i update to the v6.8 ? And what about the fast survey software of the MMCX controller in v2.3.5? Is there any chance of incompatibility  ?

Mark Silver
Member

Monday 25 March 2019: Update (#4 I think): PM2 and PM3 should survive with no firmware update:See [ https://ashgps.com/2/wnro/Spectra_SupportNote_GPS_Week2048_RevD.pdf ] for latest update including additional information on:  MobileMapper CE, CX, 6, 10 20  ProMark 2, 3  EPOCH 10,25 

James Vianna
Member

Mark, thank you very much for staying on top of this. Hopefully GNSS will survive.
Jim

Jules J.
Member

Thank you for the update Mark. 

A Harris
Member

Mark, this news will allow me stop banging my head against a post about my PM3s for the time being.
Will see what the rollover brings.
🍺

Dave Karoly
Member

I have a lot of good memories using my PM3 receivers.  I sold them, of the three one wasn’t working but I shipped all three. When I was using them 15 to 10 years ago they would get more satellites than the Trimble 4700s and 4800s I was using at work.  Processed them in GNSS Solutions with really amazing results.  GNSS solutions had a really handy ground coordinate system generator, I would routinely check coordinate pairs with my Total Station in under a hundredth. The stop&go was like super cheap RTK, worked great.  I even used them to stake out… Read more »

leegreen
Member

Surprising Topcon just released NEW firmware for the old Hiper Lite series and most of their other GPS receivers this month, for the April Rollover.To download go to https://www.topconpositioning.com/gpsrollover#feature-110916

toivo1037
Member

‘End of life’ my butt.  These things still collect data – they are still alive and kicking.  Hopefully they still work in a couple of weeks.

Dave Karoly
Member

I updated the two GR3s we still have.  The file light wouldn’t come on.  It turns out the file system needs to be initialized.  I got a green REC light on one, initializing the other one.
The FC500 controller is dead, on charge now so can’t test RTK yet but can test static.
So the moral of the story is you may lose all the files still on the receiver so download them if necessary.  The last use these ones saw was two years ago so they were downloaded long ago.

Jim Frame
Member

I was surprised to see that the PM2 isn’t affected.  I haven’t turned mine on in about a decade, but apparently they still work.

Dave Karoly
Member

According to the email from Trimble we need at least firmware version 2.32; we have 4.84 on three R4-3 receivers and 5.35 on three R8s receivers so we should have a go for launch.

Eric Kara
Member

This is Leica’s response on there “Myworld” website. They have been affected by these rollovers in the past, so will be crossing my fingers at 12:01am.

“GPS Week Rollover

Occurring 6 April 2019, the transmitted GPS week number in the navigation message will rollover from 1023 to 0. All currently operational Leica Geosystems GNSS receivers will not be affected by this rollover.
Nevertheless, to ensure the best possible performance, it is a good practise to use the latest firmware. Please refer to the myWorld portal or contact your local Leica Geosystems representative to obtain the latest firmware versions.”

gschrock
Member

A new WNRO resource page from Unavco (the folks that run the Earthscope PBO GNSS array). They have links to info for all of the models/makes they have (or have had) in their inventory,  and results of some of their own tests (and an interesting video of one of those tests).

toivo1037
Member

The sky is falling! The sky is falling!GPS rollover is upon us!I set 5 nails in the yard yesterday, in a line 5 feet apart.  I collected 2.5 hours of data with 5 receivers, 1 new Javad, and 4 older units.  I will download and process the data myself against a local CORS station and compare the results.  I will also upload each file to OPUS to verify their software is getting the same results as mine, and everything is 5ft apart and in a line.  Next week I will repeat the procedure and see if the results match.  I… Read more »

RETIRED69
Member

I tested some Promark Xcm units … dates were about 19-1/2 years off(August 1999), but everything else “appears”, okay … we shall see once I re-learn how to download the data, make Rinex files and how I used to change the dates on the Rinex files.
BTW … I have 14 Promark Xcm’s, and they look virtually brand new. I plan on giving 4-5 to a buddy in southern Ohio, might keep 2-3 and would like to find someone who could use what’s left …
 
John

Bill93
Member

I don’t think you need a careful test of accuracy.  With this change, either it will process or it won’t.’

leegreen
Member

I was told Topcon ran some tests. They concluded that receivers made after 1999 will survive tomorrows rollover, even without the suggested firmware updates. Basically, those that do not update the firmware will have clock issues that will likely take much longer to initialize. However, accuracy should not be affected.