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raspitrick
Posts: 29
Joined: Fri Jun 07, 2013 12:49 pm
Contact: Website

Precision GPS+GLONASS+SBAS GNSS expansion board

Thu Jun 26, 2014 1:14 pm

Hi everybody!

We developed a precision combined GPS+GLONASS+SBAS GNSS receiver expansion board for the RasPi called RasPiGNSS (see http://drfasching.com/products/gnss/raspignss.html).
It is based on the NV08C-CSM GNSS chipset, one of the most advanced L1 receivers available from NVS Technologies (http://www.nvs-gnss.com).
Here's how it looks like:
Image
Besides NMEA output this board delivers also raw GNSS data that can be processed with RTKLIB (http://www.rtklib.com), either on the RasPi itself or elsewhere, enabling PPP (precise point positioning) solutions up to decimeter-precision, and even centimeter-precision in RTK (real-time kinematics) mode using a reference station!
Note that this is not your everyday convenience GPS stick - don't buy it if you're just after a longitude/latitude position. It is more suited as a precise measurement device for field survey, robotics, drones or traffic tolling applications.

A commercial service selling a complete device plus server account for RTKLIB postprocessing is available from http://www.pi-gnss.com. We made parts of the software available as open source, as well as the STEP files for 3D-printing the smart case that fits exactly to a PI model A with the RasPiGNSS expansion board. You can download the software and the STEP files here: http://drfasching.com/products/gnss/ras ... ation.html.

Please find more information about RasPiGNSS at http://drfasching.com/products/gnss/raspignss.html!
RasPiGNSS - a precision GPS+GLONASS+SBAS expansion board (drfasching.com/products/gnss/raspignss)

erezpeleg
Posts: 2
Joined: Tue Sep 16, 2014 12:03 pm

Re: Precision GPS+GLONASS+SBAS GNSS expansion board

Tue Sep 16, 2014 12:19 pm

hello,
WHat can I expect for PPP accuracy results in real time.
Is it possible to load corrections for the next day and still recieive high accuracy? less than 1m 3sigma?
also,
what is the fix rate that can be prcessed bu the R-Pi with the RTKLIB doing RTK or PPP?
Thanks.

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raspitrick
Posts: 29
Joined: Fri Jun 07, 2013 12:49 pm
Contact: Website

Re: Precision GPS+GLONASS+SBAS GNSS expansion board

Tue Sep 16, 2014 2:31 pm

erezpeleg wrote:hello,
WHat can I expect for PPP accuracy results in real time.
Is it possible to load corrections for the next day and still recieive high accuracy? less than 1m 3sigma?
also,
what is the fix rate that can be prcessed bu the R-Pi with the RTKLIB doing RTK or PPP?
Thanks.
You can expect 1-sigma down to 20cm, even with ionosphere corrections for the next day (Note: Quality GNSS antenna highly recommended!)
The NV08C is able to deliver raw data up to 10Hz. We're currently testing with rtkrcv and SBAS corrections on the RasPi, but CPU usage is very low, so in theory there's nothing against RTKLIB fix rates of up to 10Hz as well.
RasPiGNSS - a precision GPS+GLONASS+SBAS expansion board (drfasching.com/products/gnss/raspignss)

erezpeleg
Posts: 2
Joined: Tue Sep 16, 2014 12:03 pm

Re: Precision GPS+GLONASS+SBAS GNSS expansion board

Sun Nov 30, 2014 4:31 pm

Thanks,
I bought the baord and just got it.
Will try to use it in the next few days.
Is there any specific setup to have the serial port working that is not documented in your setup page?
first trial did not work.
I hope to have more time by the next weekend.
Sincerely,
Erez

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raspitrick
Posts: 29
Joined: Fri Jun 07, 2013 12:49 pm
Contact: Website

Re: Precision GPS+GLONASS+SBAS GNSS expansion board

Sun Nov 30, 2014 5:24 pm

Hi erezpeleg,

just follow the instructions on the setup page.
Most important thing is that the /dev/ttyAMA0 port is not used by Raspbian as a console, and that the serial port parameters are set correctly. Try "stty -aF /dev/ttyAMA0" to display the current settings.
RasPiGNSS - a precision GPS+GLONASS+SBAS expansion board (drfasching.com/products/gnss/raspignss)

andrewhack
Posts: 1
Joined: Fri Apr 03, 2015 12:38 pm

Re: Precision GPS+GLONASS+SBAS GNSS expansion board

Fri Apr 03, 2015 12:41 pm

Hi,
The board cover the entire GPIO. Probably you are using the serial and power pins - can I use the others?

Regards

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