Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: Possible GPS Date Rollover problems week of April 6, 2019
    From: Richard B. Langley
    Date: 2019 Mar 28, 05:01 -0700

    1) Even some modern GNSS receivers may fail if they don't have the latest firmware installed. Natural Resources Canada, for example, has been busy the past few weeks updating the firmware  in some of the receivers of their continusouly operating reference network. The correct date and time is needed to compute the coordinates of the satellites. If done incorrectly, the receive will produce bogus positions. So, it's not just about displaying the correct date.

    2) The firmware in some receivers has a coded reference date used to compute the correct date and time. If too far removed from the current date, the receiver will fail at some point, not necessarily at the epoch of the rollover. This is true of NovAtel receivers and the ones I have in my instrument on the CASSIOPE satellite will fail about three years from now.

    3) I have been helping the journal Nature on an article about the rollover. We'll see if they think the event is important enough to publish it.

    -- Richard Langley

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site