[chbot] Differential GPS

[Mark Atherton]

splendid, splendid...


Correction is normally carried at LF 
<http://en.wikipedia.org/wiki/DGPS>http://en.wikipedia.org/wiki/DGPS

Strangely enough 
<https://www.sparkfun.com/products/163>https://www.sparkfun.com/products/163

http://www.robotshop.com/content/PDF/gps-dgps-sbas-rtcm-english-gps-pa6b-dip.pdf 


looks like RTCM SC-104 might be useful "TRANSMISSION CHARACTERISTICS 
OF MARINE DIFFERENTIAL GPS (DGPS) STATIONS"

<http://diydrones.com/forum/topics/how-to-build-my-own-dgps>http://diydrones.com/forum/topics/how-to-build-my-own-dgps 


and you have probably seen 
<ftp://ftp.tapr.org/gps/dgps.assembly.manual.pdf>ftp://ftp.tapr.org/gps/dgps.assembly.manual.pdf

am sure you have seen most of this already, but a module that accepts 
SC-104 data input seems to be what you need - and uBlox rings a bell...

<http://www.u-blox.com/en/tutorials-links-gps.html>http://www.u-blox.com/en/tutorials-links-gps.html 


-Mark


At 01:53 p.m. 29/05/2013, you wrote:
>Greetings all
>
>I'm just mulling over ideas for a walnut picker-upper and one of the
>requirements will be accurate positioning to make sure that I don't run
>into trees or irrigation nozzles. I think that if I can get below 0.5m
>accuracy within 300m of a fixed reference then it would be doable.
>
>Does anyone have information on such a system, perhaps transmitting in the
>433MHz ISM band at very low power.
>
>TAPR did have one but the Motorola Oncore VP OEM GPS receiver they used is
>no longer available so it looks like the whole project is dead.
>
>I'm sure with the cheap GPS receivers available now there must be
>something available that can lock to a defined set of birds so that mobile
>and static receivers look at the same ones and correction information can
>be sent at a low rate from the static to the mobile station.
>
>Thoughts appreciated...
>
>--
>Robin Gilks
>
>
>
>
>
>
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