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GNSS-EGNOS-EDAS-public_copy

This repository is designed to gather data from 3 GNSS receivers at the same time and send them into a database.

In this case, one receiver gets corrections from EGNOS, one gets correction from EDAS, and one stays autonomous.

File Descriptions:

  • sqlcreate.txt: Input into the database to create tables.
  • run.py: Runs read_filtered1.py, read_filtered2.py, and read_filtered3.py at the same time.
  • read_filtered1.py: Retrieves data from the receiver set to autonomous.
  • read_filtered2.py: Retrieves data from the receiver set to EGNOS.
  • read_filtered3.py: Retrieves data from the receiver set to EDAS.

Files read GGA, GSA, GSV, and GST NMEA messages. The main table data is averaged every 15 seconds. GSV messages are saved every 60 seconds, and GSA messages are saved every hour. The data is being sent into the database

Data visualization examples:

Comparison of 1 autonomous receiver and 2 EGNOS receivers:

Dashboard Link - click here

LIVE MAP OF EGNOS/EDAS MONITORING

Dashboard Link - click here

Serial ports settings on Linux:

For the proper functioning of the scripts, it is necessary to set the correct symbolic links to physical USB ports.

  • Symbolic link for the EGNOS receiver is: "downblue"
  • Symbolic link for the autonomous receiver is: "topblue"
  • Symbolic link for the EDAS receiver is: "downblack"

To do that, you need to input the following into /etc/udev/rules.d/10-local.rules:

SUBSYSTEM=="tty", ATTRS{devpath}=="1.1", SYMLINK+="topblue" 
SUBSYSTEM=="tty", ATTRS{devpath}=="1.2", SYMLINK+="downblue"
SUBSYSTEM=="tty", ATTRS{devpath}=="1.4", SYMLINK+="downblack"

Where 1.1, 1.2 and 1.4 first number represents usb controller and second number represents usb hub.
After saving the 10-local.rules file, you need to load these rules with the command:

sudo udevadm control --reload-rules

To obtain the USB controller and USB hub, use the command:

udevadm info -a /dev/ttyACM0

You will find these numbers in the following lines at the top:

looking at device '/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.1/1-1.1:1.0/tty/ttyACM0'
looking at device '/devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.2/1-1.2:1.0/tty/ttyACM1':

To obtain the correct device file (/dev/ttyACM0), use:

dmesg

To test if everything works correctly, use:

ls -l /dev/topblue
ls -l /dev/downblue