[Loadstone] Observations on Accuracy with Two Receivers

Kevin Chao g.unit89 at clearwire.net
Tue Oct 23 03:59:58 BST 2007


What is this user range error? 

I have read of various other equations and ones that require integrals and
simations, but not ones that use the "user range error."

Kevin 

-----Original Message-----
From: loadstone-bounces at loadstone-gps.com
[mailto:loadstone-bounces at loadstone-gps.com] On Behalf Of Shawn Kirkpatrick
Sent: Monday, October 22, 2007 5:19 PM
To: loadstone at loadstone-gps.com
Subject: Re: [Loadstone] Observations on Accuracy with Two Receivers

The equation for getting the accuracy in metres is to multiply the hdop by
the user range error setting. The same goes for the vertical accuracy,
multiply vdop by user range error. The conversion to feet is done if the
user has it set to use imperial. I'm not completely sure if this is the
correct equation but I think it is. Vertical accuracy is a lot less accurate
but that's up to the receiver.

On Mon, 22 Oct 2007, Kevin Chao wrote:

> I am sure that the hdop reading is taken into account when reporting 
> the accuracy in number of feet.
>
> I am wondering what equation is the LoadStone team using to take the 
> hdop value and giving the user a number of feet?
>
> Is there a similar equation that can be used for the vdop? I know that 
> the vertical reading is a lot more flakey and less accurate, but just
wondering.
>
>
> Thanks,
>
> Kevin
>
> -----Original Message-----
> From: loadstone-bounces at loadstone-gps.com
> [mailto:loadstone-bounces at loadstone-gps.com] On Behalf Of Michael O. 
> Hanson
> Sent: Monday, October 22, 2007 1:25 PM
> To: loadstone at loadstone-gps.com
> Subject: [Loadstone] Observations on Accuracy with Two Receivers
>
> Changing accuracy from a number to a number of feet was a great
improvement.
>
> I don't want to start the great GPS receiver controversy or anything 
> like that.
>
> Some users might find the information below helpful.  I do not claim 
> that these test results are anything close to conclusive.  They are my 
> observations.
>
> My testing was not performed under scientific or controlled conditions.
> Other users could get vastly different results for any number of reasons.
>
> I tested a Holux M-2000 and a Royaltec RBT-2110.  I tested both 
> receivers in my living room and outside.
>
> The Holux got average readings of between twenty and thirty feet.  The 
> lowest was 20.8 feet.  The highest was thirty feet.
>
> The Royaltec got readings of between fifty-five feet and ninety-four feet.
> The lowest was fifty-four feet.  The highest was ninety-six feet.
>
> The Holux averaged eight to ten out of twelve satellites.  The 
> Royaltec averaged four out of twelve.
>
> I know the Royaltec is somewhat better at tracking direction changes.  
> It is a perfectly usable receiver in my experience.  If there is some 
> factor I am not taking into account, please let me know.
>
>
> Mike Hanson
>
>
>
>
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