GPS WEEK ROLLOVER 2019

Sean Joyce

Sean Joyce

Well-Known Member
I just received these questions in an email. I doubt this is even an issue for Javad GNSS but thought I would solicit an answer.



https://spectracom.com/resources/blog/lisa-perdue/2018/gps-2019-week-rollover-what-you-need-know





Hello,

I’m a featured writer for the New Jersey Society of Professional Surveyors Good Points and am looking to publish on the GPS week rollover. I’d like to spotlight comments from network providers and receiver manufacturers. Please provide any input, as many of the end-users of your equipment or broadcasted corrections should be following suit with preparations you may be making now. Also, I would love to feature any responses to the questions below (feel free to elaborate). Please forward this on to anyone who can offer information that can be featured and distributed to my State’s Society and the Tri-State area.

  • · What is/has your organization done to successfully observe the April 2019 GPS week rollover?

  • · What are some of the other improvements included in firmware updates to GPS receivers?

  • · What are the minimum versions of firmware in your systems required to successfully observe the rollover?

  • · Are there software solutions to correct for the errors in time observations after the rollover for those who cannot/will not update?


Thanks again for the time, and we look forward to featuring you in the latest edition of Good Points!


Sincerely,

Jacob Elliott
Staff Surveyor II
 
Matt Johnson

Matt Johnson

Well-Known Member
5PLS
I think your questions are mostly answered in the article you linked:

1541608494819.png


The firmware improvements are listed in the release notes for each version. They can be found at http://www.javad.com/jgnss/support/update.html
 
Sean Joyce

Sean Joyce

Well-Known Member
Thanks Matt I kind of figured that was the case but was just looking for an answer from Javad GNSS.
 
toivo1037

toivo1037

Active Member
Some of us are operating Javad receivers that are that old. Could not even guess when the firmware was updated. I just know that they still work as of today, and are useful on projects where I need a load of static receivers. I think I will hold off on the new battery system I mentioned until I am sure they don't brick though.
 
John Troelstrup

John Troelstrup

Active Member
Erhmm....
Today - My base was collecting data from 8/22/1999 to 04/07/2019
And I could not DPOS...
I left the field. I need to go back tomorrow - Is there a fix for this or do I start over?
 
John Troelstrup

John Troelstrup

Active Member
I bought my Triumph in late 2017. I have read about the GPS rollover for the last 2 weeks, but every article I read said "older" and "outdated" GPS equipment such as GPS navigation in older vehicles or phones etc....
 
Adam

Adam

Well-Known Member
5PLS
It appears to be a JField issue. The GNSS boards are displaying the date correctly. You should still be able to rtk but i'm not sure about using dpos.

John, can you post the file?
 
Adam

Adam

Well-Known Member
5PLS
An update on pre release just came thru with the date fix. Look for update to release soon.
 
Steve Douty

Steve Douty

Well-Known Member
Adam said:
An update on pre release just came thru with the date fix. Look for update to release soon.
Click to expand...
So, are you saying that without the pre-release there is no point in gathering data today?
A simple, straight answer from JAVAD qwould be nice.
 
Adam

Adam

Well-Known Member
5PLS
RTK should work. I'm not sure about DPOS though. I have nothing to test.
 
Shawn Billings

Shawn Billings

Shawn Billings
5PLS
DPOS is accessible with the update to 3.0.1.419

I don't know what will happen with data collected with wrong date. Pre-Release 3.0.1.419 fixes the date in J-Field, so I would expect DPOS to work properly with data collected with this version or higher.
 
Nate The Surveyor

Nate The Surveyor

Well-Known Member
This is the second time this week-rollover has occurred. 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.
And, guess what? That was yesterday.
So, my thoughts are: don't try to "survey through the rollover". Do a firmware upgrade after the rollover, before attempting field work. Pay extra attention to dates, and times.
Expect a little trouble.
Give the mfr's a little room to sort out things. It only happens about once every 19 yrs.
Nate
 
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