Re: [talk-au] Experiments in sub meter accuracy for under $30 (thirty) dollars

2019-12-12 Thread Alex Sims
Well it sort of works, I'm having trouble testing as I need to use a Windows 
machine to run u-center, and my main machine is not Windows. It is also very 
bright outside and the screen is not.

Nevertheless I've tried running it in a single position (ie leave it on the 
ground) and get the drift within a 1.5m x 1m box on the edge of an oval. 

It does appear to work and switches to Differential Mode rather than 
Autonomous. Key things I've found out are the satellite is at an elevation of 
49 degrees and an Azimuth of 9 degrees (from Adelaide) and C/NO 42. You have to 
manually set the PRN code to 122 to use only the Australian SBAS. You need to 
turn Galileo off as there are no corrections for it (on L1) and just use GPS 
and GLONASS. In the SBAS menu you must turn on "allow test mode use Msg 0". It 
was recommended to turn off Ranging. 

Things specific to my setup are you need to save the configuration to the Flash 
memory otherwise you have to reconfigure each time you plug it in (CFG Menu). 
In the config it was recommended to me to set in the NAV5 menu an appropriate 
Dynamic Model, I'm using "Stationary". I lose the SBAS each time an aircraft 
passes between me and the SBAS satellite.

Running it indoors (concrete tiles, brick walls) for about twenty minutes 
stayed in a 10m x 10m box.

The next step is to get it running under OSX and be able to detect it is in 
Differential mode, and try visiting some survey marks sometime next week.

Alex


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[talk-au] Experiments in sub meter accuracy for under $30 (thirty) dollars

2019-12-12 Thread Alex Sims
Hi,

I have been trying for some time to get better accuracy for survey mapping and 
think I might now be on to something. I’ve just got off the phone with Chris 
Marshall from Frontier SI who is promoting the use of the Geoscience SBAS test 
bed and was really helpful

I’m now armed with a Ublox M8030 USB dongle (birthday present, Chinese 
manufacturer, appears genuine at least from the boot messages etc) and 
instructions on key points in configuring it in u-center.

I’m hoping to get sub meter accuracy,  which should be possible as long as I 
can see the SBAS satellite.

Failing that I’ll wait for the Xiaomi Mi8, with dual band (1&5) to fall in 
price to be within my grasp

Alex
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