Re: GPS Navigation for Ship - Single Receiver or Multiple Receivers?

From: Clay Turner (physics_at_bellsouth.net)
Date: 06/09/04 

Date: Wed, 9 Jun 2004 15:01:53 -0400

Hello Ray and others,

The U.S. Coast Guard is currently working on a Nationwide Differential GPS
network.

Some info here:

http://www.tfhrc.gov/its/ndgps/02072.htm

http://www.navcen.uscg.gov/dgps/ndgps/default.htm

http://www.uscg.mil/hq/g-cp/comrel/factfile/Factcards/DGPS.html

I hope this helps,

Clay

"Ray Andraka" <ray@andraka.com> wrote in message
news:40C74F5F.378AA0EB@andraka.com...
> In order to improve on the raw GPS accuracy, you have two options I am
> aware of, neither of which fits the bill in this case. The first is time
> averaging over an extended interval, which is used for surveying. This
> obviously is not compatible with a moving vehicle or ship. The second
> involves placing a second GPS at a known fixed location somewhat near the
> area of the GPS on the moving platform and using the errors in its
> readings to correct the moving GPS position. This is differential GPS,
> which is usable for things like precision approaches to airports (there
> are two versions of that, a wide area version covers a larger area but at
> reduced precision, a local area one that needs the second receiver fairly
> close by but is only effective for a relatively small local area). You
> could use other sensors (inertial or Loran) combined with the GPS current
> position and recent history to get some of the advantages of the time
> averaging at the expense of more processing.
>
> "Yan.L" wrote:
>
> > Is one GPS receiver enough to get the precise position? Or we need to
> > use multiple GPS receivers, for instance, four GPS receivers installed
> > on bow, tail, port and starboard, respectively?
> >
> > If we use four GPS receivers, how to manipulate the GPS information
> > collected by these four receivers to get the precise position of the
> > ship?
>
> --
> --Ray Andraka, P.E.
> President, the Andraka Consulting Group, Inc.
> 401/884-7930 Fax 401/884-7950
> email ray@andraka.com
> http://www.andraka.com
>
> "They that give up essential liberty to obtain a little
> temporary safety deserve neither liberty nor safety."
> -Benjamin Franklin, 1759
>
>

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