Question about 16-channel vs 12-channel GPS receivers.

Discussion in 'General GPS' started by hamilton, Jan 10, 2005.

  1. hamilton

    hamilton Guest

    I have a question about the 16-channel GPS receivers that are becoming
    popular. What, if any, is the practical benefit of having 16 channels?
    Are such receivers more accurate or stable in operation? Can anyone
    point me to a source of details about the differences in operation?
    Best regards Alexander Nikolayev
     
    hamilton, Jan 10, 2005
    #1
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  2. hamilton

    Sam Wormley Guest

    hamilton wrote:
    > I have a question about the 16-channel GPS receivers that are becoming
    > popular. What, if any, is the practical benefit of having 16 channels?
    > Are such receivers more accurate or stable in operation? Can anyone
    > point me to a source of details about the differences in operation?
    > Best regards Alexander Nikolayev
    >


    What 16-channel GPS receivers are becoming popular?
     
    Sam Wormley, Jan 10, 2005
    #2
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  3. hamilton

    hamilton Guest

    I don't have any specific information. I seem to be seeing them
    advertised with greater frequency.
     
    hamilton, Jan 10, 2005
    #3
  4. hamilton

    Mike R. Guest

    >> What 16-channel GPS receivers are becoming popular?

    I did a google search and found a bunch, mostly in bluetooth GPS and
    GPS integrated into astronomy telescope. It appears that the latest
    chipset can accommodate 16 channels.

    >>What, if any, is the practical benefit of having 16 channels?


    I guess the more channel the better when it comes to GPS. Right off
    the bat, if you have a 12-channel GPS and you use WAAS, two channels
    are used for this (Garmin units at least). So you are left with 10
    channels to track satellites. In some cases the receiver can see more
    than 10 satellites. The ability to see more than 4 satellites needed
    for 3D navigation is helpful when one or more satellites (being used)
    are blocked by trees and bridges, etc. I'm not sure you'd need 16 but
    since it's available on one chip...why not?
     
    Mike R., Jan 11, 2005
    #4
  5. Mike R. wrote:
    >>>What 16-channel GPS receivers are becoming popular?

    >
    >
    > I did a google search and found a bunch, mostly in bluetooth GPS and
    > GPS integrated into astronomy telescope. It appears that the latest
    > chipset can accommodate 16 channels.
    >
    >
    >>>What, if any, is the practical benefit of having 16 channels?

    >
    >
    > I guess the more channel the better when it comes to GPS. Right off
    > the bat, if you have a 12-channel GPS and you use WAAS, two channels
    > are used for this (Garmin units at least). So you are left with 10
    > channels to track satellites. In some cases the receiver can see more
    > than 10 satellites. The ability to see more than 4 satellites needed
    > for 3D navigation is helpful when one or more satellites (being used)
    > are blocked by trees and bridges, etc. I'm not sure you'd need 16 but
    > since it's available on one chip...why not?
    >

    In the old days, there were 24 active GPS satellites. Usually half of
    them are on the other side of earth so they are useless. So we got a
    channel for every visible satellite, that's a total of 12. You mention
    WAAS using two channels, that's 14. Then the EU is still developing
    Galileo which brings some more satellites in orbit, so in a few years
    you might be able to use ~26 channels at the same time. Every used
    satellite adds a (every time a bit tinier) bit to accuracy.

    --
    Hans Fleischmann

    h-nl
    PGP-KeyID: 0x676FB35B - A26E A57D C006 C19B 9A42 A688 C241 C255 676F B35B
    +31650525455
     
    Hans Fleischmann, Jan 11, 2005
    #5
  6. hamilton

    Mike R. Guest

    Hans, we are talking about GPS satellites, right? Unless Galileo
    satellites are identical...that's not the same. The existing
    16-channel GPS can't understand Galileo signals I don't think.
     
    Mike R., Jan 11, 2005
    #6
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