[FOSS-GPS] RTKLIB Vehicle Accuracy

Tue Jul 1 13:07:01 PDT 2014

Ok, interresting. Is is working with the patch on both rover and base?
I have tried with a setup, but I had had very bad results, especially
when I moved. Attached is results I have had, and that with antennas
as [1] with bias voltage on and half a meter of coax. The signal is
great as far as I remember. I have LEA6T's also (maybe 4T), although I
don't quite remember exactly, it is quite some time ago since I tried.

Attached is a post processed result.

[1] http://dk.rs-online.com/web/p/smt-antenner/7239151/?searchTerm=SM-1575&relevancy-data=636F3D3226696E3D4931384E4B6E6F776E41734D504E266C753D6461266D6D3D6D61746368616C6C7061727469616C26706D3D5E5B5C707B4C7D5C707B4E647D2D2C2F255C2E5D2B2426706F3D313326736E3D592673743D4D414E5F504152545F4E554D4245522677633D424F5448267573743D534D2D3135373526

2014-07-01 21:38 GMT+02:00 Anton Strydom <agstrydom at gmail.com>:
> Hi Nick
>
> Yes I get a reasonable plot using that specific unit. However for what we
> intend doing in the long term we will be using a different design helical
> antenna that we are in the process of developing.
>
> The units in the photographs are only for testing and setting up but we get
> good results. For communication we use cellular routers connected to Leica
> GGO2 L1/L2 base or else we use 3D Robotics XBEE radios. On the roving unit I
> use an ARM processor where I have 4 rs232 ports available. It works very
> well and is very stable.
>
> The radios I use where i have no cellular coverage.
>
> Attached is a photograph of  the base setup
>
> Regards
>
> Anton
>
>
> On Tue, Jul 1, 2014 at 9:27 PM, Nick Østergaard <oe.nick at gmail.com> wrote:
>>
>> Hi Anton
>>
>> Really? You get by with that small patch antenna? Is that a good (green in
>> rtkplot) RTK solution you get from that constant?
>>
>> Regards
>> Another Nick
>>
>> Den 01/07/2014 21.11 skrev "Anton Strydom" <agstrydom at gmail.com>:
>>
>>> Hi Nick
>>>
>>> I have done a lot of testing with U-Blox LEA 6T at speeds of up to 120 km
>>> / h. Lat & Lon does not appear to be a problem but elevation is a problem. I
>>> paid the equivalent of $60 for the 2 receivers and ceramic patch antennas.
>>>
>>> They are accurate on base line up to 10km where after accuracy
>>> drastically degrades.
>>>
>>> I do all my testing in real time and do not post process.
>>>
>>> If you want to I can speak to my supplier and see if they still have some
>>> of the LEA 6T's in stock at the price I paid for them.
>>>
>>> Attached are photographs of the units I am using
>>>
>>> Regards
>>>
>>> Anton
>>>
>>>
>>> On Tue, Jul 1, 2014 at 8:50 PM, Danny Miller <dannym at austin.rr.com>
>>> wrote:
>>>>
>>>> It does work in moving.  But signal problems do still make the position
>>>> jump around, trees and buildings and an antenna's orientation changing can
>>>> make an error happen.  Antenna quality has a lot to do with that, too.
>>>>
>>>> RTKLib requires a GPS with RAW pseudorange outputs.  The NV08C is a
>>>> good, cheap one to do it:
>>>>
>>>> http://www.nvs-gnss.com/contacts.html
>>>>
>>>> Contact your local sales rep there- it was actually easy in my
>>>> experience to order a couple from them, and oddly cheaper than Newark
>>>> element 14, as well as quicker to ship.
>>>>
>>>> Danny
>>>>
>>>>
>>>> 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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>>>
>>>
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>>
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>
>
>
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