[FOSS-GPS] RTKLIB Vehicle Accuracy

Danny Miller dannym at austin.rr.com
Tue Jul 1 12:05:02 PDT 2014

Also of note your link to your base station data must be reliable, and 
constant.  It would be difficult to (legally) transmit this yourself 
over a substantial range.  More likely you'd use your cellphone's data 
plan.  You will need reception across the areas you wish to map.

Keep in mind your orientation is very variable if you're talking 
off-roading.  The antenna will be on TOP of the truck, right? Could be 5 
ft off the ground.  If you're climbing a 15% grade, your height would 
appear 2" lower, and your position would read 15.5" to the side of where 
your wheelbase is actually centered above.

IF this is an offroading scenario, you'd want a MEMS accelerometer to 
read your roll/pitch of the vehicle in order to compensate for problems 
in antenna position.

Public surveys of elevation over the USA and the whole world do exist, 
and are fairly accurate.  DEM- Digital Elevation Map- comes to mind.


On 7/1/2014 1:24 PM, Nick wrote:
> Hello,
> I am interested in getting an RTK GPS setup working for a moving 
> vehicle, not fast, perhaps 10 mph. I would postprocess the data 
> collected later, using data downloaded from a nearby station.
> My desire is to log elevation data every few seconds as the vehicle 
> drives. I hope to achieve 10-20 cm accuracy for the position and the 
> elevation.
> As I research RTKLIB, it seems like most information I come across is 
> regarding a static location. Is my goal feasible to achieve this kind 
> of accuracy as the vehicle moves?
> If so, can anyone recommend a good board to get me started? I'm hoping 
> to be able to do this for under $200 (just one receiver since the base 
> station is public) -- please give me a reality check if this is 
> unlikely. Thanks,
> Nick
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