[FOSS-GPS] RTKLIB Vehicle Accuracy

[Anton Strydom]

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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