Optimized GPS & PPS config for u-blox NEO-M8N
geoffreyheller opened this issue · 2 comments
Thanks for providing this great script for setting up the RPi Stratum One time server!
In addition to your script, I thought you might want to add some documentation for how to optimally set up the common u-blox NEO-M8N as a time source.
The following are the notes I used to configure my own M8N. I was hoping to share this and potentially get some feedback / questions. Once the config is agreed we could make an automated configuration script to set up the GPS devices themselves.
The following instructions are for u-center v21.09 and the NEO-M8N:
The following assumes that for configuration purposes you are connecting your PC to the M8N using a USB cable, and that your Raspberry Pi's ttyAMA0 UART is connected directly to UART1 on your M8N.
FIRST RESET TO FACTORY DEFAULTS
Tools > Firmware Update Utility
Check "Program FIS only"
FIS file: C:\Program Files (x86)\u-blox\u-center_v21.09\flash.xml
Check "Use chip erase"
GO
-or-
UBX > CFG > CFG
Reset to defaults
Send
CONFIGURATION
View > Configuration View
UBX > CFG > PRT
Target: 1 - UART1
Protocol out: 1 - NMEA
Change Baudrate to 115200
Send
UBX > CFG > CFG
Save current configuration
Send
NOTE: U-center won't show a baud change since we are connected with USB and not UART1
UBX > CFG > GNSS
Enable GPS only (32 channels)
Send
UBX > CFG > SBAS
Subsystem: Disabled
Send
UBX > CFG > NAV5
Dynamic Model: 2 - Stationary
Send
UBX > CFG > TP5
Check Active
Pulse Period: 1000000
Check Align to TOW=0
Set: 0-UTC Time
Check Rising Edge on TOS
Send
UBX > CFG > PMS
Setup ID: 0-Full Power
Check: Save configuration
Send
UBX > CFG > RATE
Time Source: 0 - UTC Time
Send
UBX > CFG > MSG
Uncheck all boxes for:
F0-01 NMEA GxGGL
F0-02 NMEA GxGSA
F0-03 NMEA GxGSV
F0-04 NMEA GxRMC
F0-05 NMEA GxVTG
Check all boxes for:
F0-00 NMEA GxGGA
F0-08 NMEA GxZDA
(Summary: Keep only the GPGGA and GPZDA messages)
UBX > CFG > CFG
Save current configuration
Send
Update: I'm going to see if I can get the same settings using ubxtool
thanks,
but i do not plan to add documentations for a specific device (i not own).
i think the u-blox documentation / Interface Manual 'u-blox8-M8_ReceiverDescrProtSpec_UBX-13003221.pdf'
is good enough.
i will keep you feedback open for a while