How to select and access RTCM in LIV4F

[patrikpordi]

Hey!

I updated the firmware to the ME version, I am receiving some RTCM messages, but only a limited amount shows up in the message monitoring, also nothing can be decoded. Is there any documentation available on how to configure which RTCM messages should show up. I want to experiment with RTK calculations, so if there is any material on how to access and decode these RTCM messages would be highly appreciated.

Thanks is advance,

Patrik

[Tesla DeLorean]

The standards documents describing RTCM3 messages and formats of the MSM, are available for purchase from http://www.rtcm.org/

You could perhaps review tools like RTCM3TORINEX, PYRTCM or RTKLIB

Firmwares  https://www.st.com/en/embedded-software/teseo-liv4fsw.html

https://pypi.org/project/pyrtcm/

https://software.rtcm-ntrip.org/browser/ntrip/trunk/rtcm3torinex/lib

[patrikpordi]

I have the definitions, but the LIV4F only publishing a limited amount of them. My question is on how to configure the firmware to publish the rest.

[Tesla DeLorean]

Which do you actually need? A single MSMx for a given constellation, you don't need 4 thru 7, or whatever. They are different ways of expressing the same data, the 7's having the most precise data, the packets a little larger.

The table is for the "INPUTS" supported.

All stations get to see the same Ephemeris, so for RTK not a lot of value, for post-processing you can pull them from CORS.

Could be helpful for aiding in poor signal situations

1107 is SBAS MSM7

[patrikpordi]

Thanks, I just wanted to understand how it works and how to customize it.

The module suddenly stopped working and does not send any data, also no SW is possible, I tried different baud rates, recovery and factory settings as well, nothing happens.
How can I make it work again?

[GalaxyQuest]

Hi Patrik,

While reprogramming, please check the boxes, Erase NVM and Recovery. 

As indicated in previous thread the RTCM documents are only available for purchase.

The RTCM strings we output are the essential ones to get RTK fix.

RTKLib is an open source library for RTK. There is also a Windows executable called RTKNavi that you can use to get RTK working. 

If you want to understand RTCM data, there is also a tool called convbin that is included with RTKNavi that will convert the RTCM binary data into RINEX file. This will provide you a meaningful representation of the data.

Please let me know if you have questions.