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[aprssig] APRS resolution

Andrew Rich vk4tec at people.net.au
Fri Oct 5 19:03:03 UTC 2007


Well not really - my GPS is currently doing 4.5 meters res.

When we did the APRS airplane tracking it put it off the runway and on the
grass.

In that case, the system did not support the capable resolution.




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Andrew Rich VK4TEC
vk4tec at people.net.au <mailto:vk4tec at people.net.au>
http://www.tech-software.net




-----Original Message-----
From: aprssig-bounces at lists.tapr.org
[mailto:aprssig-bounces at lists.tapr.org]On Behalf Of Ken H>
Sent: Friday, 5 October 2007 11:29 PM
To: TAPR APRS Mailing List
Subject: Re: [aprssig] APRS resolution


Hey guys - this whole thing about 1 foot accuracy vs 1 foot resolution
is sorta silly - GPS just doesn't do that good.  The whole thing is a
lot like measuring with a tape measure, then writing the results to
0.001 inch - just is not there.

IF you go to differential GPS you do get to a few feet - but NOT with
the normal GPS being used for APRS.... OK, I guess there are a few
folks using differential GPS... but how many?

I've just been involved with APRS for a couple of months and find the
whole APRS thing amazing.  It's really neat.  I've been involved with
GPS for many years - from Loran A, to Loran C, to SatNav, then to GPS
with SA, then FINALLY to GPS with no SA. Is deleting SA the best thing
that happened during the Clinton years?  Well, other than all the good
jokes {grinning}

73 all.
Ken K9FV

On 10/3/07, Steve Noskowicz <noskosteve at yahoo.com> wrote:
> Since I know the difference, I take that as a yes.   (:-)  73, Steve
>
>
>
> Tapio Sokura <oh2kku at iki.fi> wrote:
> Steve Noskowicz wrote:
> > I'm no expert on GPS, but what about the random wander
> > of GPS. Does this level of accuracy need differential
> > GPS with a local GPS reference transmitter?
>
> There's a difference between accuracy and resolution. I'm not going to
> repeat the definitions, google can do that for you. Anyway your accuracy
> can be limited by resolution, which is the case with the regular 2
> decimals of minute APRS. Of course good resolution doesn't guarantee
> accuracy (or precision), but at least good enough resolution doesn't
> prevent you from reaching good accuracy.
>

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