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Re: glonass receiver?

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  • prague
    just to update this thread: garmin etrex 10 has dual gps/glonass http://www.garmin.com/us/#/outdoor/etrex10 also, the iphone 4s uses gps/glonass
    Message 1 of 7 , Nov 26, 2011
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      just to update this thread:

      garmin etrex 10 has dual gps/glonass
      http://www.garmin.com/us/#/outdoor/etrex10

      also, the iphone 4s uses gps/glonass
      https://www.google.com/search?q=iphone+4s+glonass




      --- In PanoToolsNG@yahoogroups.com, "Keith Davison" <megakd@...> wrote:
      >
      > Yes, that is how DGPS works, the location of the base station, such as a single one on
      > your farm, or one in a nationwide network, is known precisely. The base station GPS
      > receiver continually compares the GPS fix for its location with the known location and
      > transmits correction data via radio to the remote GPS receiver (in a tractor, for example),
      > the remote unit then takes its own GPS received location and corrects this with the radio
      > data from the base station.
      >
      > Obviously the nearer the remote GPS receiver is to the base station, the more accurate the
      > correction will be.
      >
      > Free DGPS data used to be transmitted around the coastlines of some countries to aid
      > marine navigation, Garmin used to sell a DGPS radio receiver that would connect to their
      > handheld units and make the necessary corrections.
      >
      > Uncorrected GPS accuracy with handheld units varies with conditions, but you should be
      > within 10m most of the time with spot fixes on a modern unit. Averaging over time with a
      > static unit improves accuracy considerably, (under 3m by 15min) but clock errors limit
      > uncorrected units to a maximum accuracy of about two metres.
      >
      > As mentioned earlier, if your unit succesfully receives WAAS or EGNOS, sub-2m accuracy
      > is possible for spot fixes.
      >
      > Keith D.
      >
      >
      > > I think that farmers use differential GPS where there is a fixed
      > > receiver on a building and is radio linked to the vehicle mounted unit.
      > >
      > > This gives a difference in readings this eliminating all satellite and
      > > atmospheric variations. Use a bluetooth or USB GPS receiver I have managed
      > > to get about 3 meters accuracy with them. Under bad conditions like under
      > > wet foliage or between tall buildings the error can go up to 25 meters.
      > > Quentin.
      >
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