[FOSS-GPS] Differential GPS with RTKLIB 2.4.2

[Vangelis Roumanis]

>From my experience i guess you should achieve +-5cm. What is the average
SNR you have at your setup? Did you give correct voltage to the antennas?
Also have a look at the troposhere and ionosphere correction method you
chose. I dont have the knowledge to tell you the best config for them.
Good Luck



2013/6/6 <rolf.elsing at online.de>

>
> Hello,
>
> I’am trying to build a differential GPS using RTKLIB 2.4.2.
> The accuracy that I can achieve is around +/-2 m.
> Which is about the same that one of my sensor achieves in PPP kinematic
> mode.
> My expectation is to achieve something around +/- 5 cm.
> The set up:
> Sensors2 UBLOX NEO6P
> AntennaTrimble Bullet III
> The sensors are installed on the roof with a free 360 °view. RTKLIB
> indicates that 6 to 8 Satellites are visible. The distance between both
> sensors is < 20 cm.
>
> Ublox Center Configuration:
> NEMA Child Messages Disabled
> UBX Child Messages Enabled
> RXM-RAW Enabled
> RXM SFRB Enabled
> RXM-RATE 200ms
> Dynamik Mode Pedestrian
> RTKLIB Configuration
> Input Streams
> Rover Serial COM 1, UBLOX
> Base Serial COM 2, UBLOX
> Log Streams
> Rover to File
> Base to File
> Solution Log
> Solution 1 toFile
> Solution 2 to File
> Options
> Positions
> Base Station Position is acquired by 10hour static measurement.
>
> So, with this setting I usually get FLOAT (90%) and intermediate FIX (10%)
> soloutions with an accuracy of +/- 2m.
> My expectation is to achieve something around +/- 5 cm.
> Is my expectation wrong?
> Have I selected the correct configuration?
> When I run the sensors stand alone in PPP Kinematic mode I also get around
> +/- 2m accuracy which matches the manufacturer provided data.So I assume
> that my Antenna, Sensor are working fine.
> Can somebody HELP ?
>
>
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