Re: questions about accuracy
From: Peter (prathman_at_comcast.net)
Date: 11/19/04
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Date: Fri, 19 Nov 2004 13:17:25 -0800
PM wrote:
> I have a Garmin V that can achieve 7' accuracy on the external car ant. A
> farmer friend of mine tells me about using GPS to plant, apply chemicals,
> etc. The way he explains it the hardware/software he is using would have to
> be a lot more accurate than 7'
>
> Is it just because the consumer GPS devices are just not that accurate to
> hold the prices down? Can anyone shed some light on this or direct me to a
> site that can.
The high-accuracy farming systems use Differential GPS where one
receiver in a fixed location receives the same satellite signals
as the mobile receiver. The receiver in a fixed location determines
what errors there are in the satellite signals and sends that
information to the mobile receiver so the effect of the errors can
be removed. Your GPS V also has the ability to accept differential
corrections and use them to improve the accuracy, but you'd need
to add a radio receiver for getting the differential data and it
would only work in places where there's a suitable fixed station
broadcasting the data.
Trimble makes many of the GPS systems used in agriculture and
their website www.trimble.com is a good source for information
about GPS in general and DGPS in particular.
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