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Posted by John Nagle on May 10, 2008, 2:14 pm
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Si Ballenger wrote:
> On Fri, 9 May 2008 10:27:43 -0700 (PDT), mattrapoport@gmail.com
> wrote:
>
>> Lots more helpful responses. It sounds like it will be very difficult
>> to achieve. It seems strange that we can get accuracy to a meter with
>> transceivers flying 20,000 kilometers above the earth (GPS) but we
>> can't get accuracy to a millimeter in a system where the transceivers
>> are all a couple feet from each other.
>
> Not strange at all unless one continues to believe that apples =
> oranges.
You can get that accuracy. It just takes the quality of engineering
that goes into GPS receivers. There has not, to date, been enough of
a market to justify the engineering investment.
Look into the GPS systems used for "precision farming".
John Nagle
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>to achieve. It seems strange that we can get accuracy to a meter with
>transceivers flying 20,000 kilometers above the earth (GPS) but we
>can't get accuracy to a millimeter in a system where the transceivers
>are all a couple feet from each other.