GPS satellites visible over a location on earth

Discussion in 'General GPS Discussion' started by GPS Baseband, Jun 12, 2008.

  1. GPS Baseband

    GPS Baseband Guest


    Can anyone please tell me where I can get the information regarding
    satellites visible to a receiver given the location of the receiver
    and the time.
    Thank you in advance.

    GPS Baseband.
    GPS Baseband, Jun 12, 2008
  2. GPS Baseband

    Sam Wormley Guest
    Sam Wormley, Jun 12, 2008
  3. GPS Baseband

    GPS Baseband Guest

    GPS Baseband, Jun 12, 2008
  4. GPS Baseband

    webpa Guest

    My many-years-old Garmin eMap does this automatically. Slew the
    location cursor anywhere on the globe and it does the same. Your
    machine doesn't?
    webpa, Jun 22, 2008
  5. GPS Baseband

    s_anode Guest

    You could also look at: to see
    where each GPS is at the current time.

    Slew through the prior day's video to see where they are at a time
    other than the current. Positions are 4 minutes earlier every day.
    s_anode, Jun 29, 2008
  6. GPS Baseband

    Jon Guest

    Nice page, Tom.
    Could you explain why the GEOs are highlighted as NPA?

    Jon, Jun 29, 2008
  7. GPS Baseband

    Wayne R. Guest

    I'm going to guess that the position info of those satellites aren't
    used for precision approaches, just the data they transfer for WAAS.
    Wayne R., Jun 29, 2008
  8. GPS Baseband

    s_anode Guest

    The governing spec for airborne WAAS equipment RTCA DO-229
    requires the User Differential Range Error (UDRE) to be 15 m or less
    before a ranging source is a allowed in a precision approach
    navigation) solution. The GEOs can be used as ranging source for
    Non-precision approach (horizontal only) if the UDRE is 150 m or
    The GEOs can also be used any time the UDRE is other than Do Not
    Use or Not Monitored in non-safety of life applications.

    The WAAS GEOs currently have an artificial UDRE floor of 50 m.
    UDRE is a 4 bit number, 50 is the next size after 15. That floor will
    changed to 7.5m later this summer when the next version of WAAS
    software is fielded.

    s_anode, Jun 29, 2008
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