Galileo OSNMA Authentication Analyzer

A Python script for analyzing and visualizing Galileo OSNMA (Open Service Navigation Message Authentication) authentication status from GNSS-SDR log files.

Features

Log parsing: Extracts OSNMA authentication data from GNSS-SDR log files.
Visualization: Creates timeline plots of OSNMA authentication status.
Multiple output formats: Supports PDF, PNG, SVG, EPS, and JPG formats.

Prerequisites

Python 3.6+
Required Python packages:
- pandas
- matplotlib

Usage

usage: osnma_log_viewer.py [-h] [--localtime] [--no-show] [-o OUTPUT] [--start START] [--end END] [-v] logfile

Generate a Galileo navigation message authentication timeline plot from a GNSS-SDR log file.

positional arguments:
  logfile              GNSS-SDR log file path

options:
  -h, --help           show this help message and exit
  --localtime          Display results in local time instead of UTC
  --no-show            Run without displaying the plot window
  -o, --output OUTPUT  Output file for plot (default: osnma_auth_timeline.pdf)
  --start START        Initial datetime in "YYYY-MM-DD HH:MM:SS" format
  --end END            Final datetime in "YYYY-MM-DD HH:MM:SS" format
  -v, --version        Show program version and exit

Example: osnma_log_viewer.py gnss-sdr.log --output auth_timeline.png --no-show --localtime

Basic Usage

osnma_log_viewer.py gnss-sdr.log

This will create a plot named osnma_auth_timeline.pdf in the current directory.

Specify output file name

osnma_log_viewer.py gnss-sdr.log -o authentication_timeline.png

Supported output formats
- .pdf - Vector PDF (recommended for publications)
- .png - Raster PNG image
- .svg - Scalable Vector Graphics
- .eps - Encapsulated PostScript
- .jpg - JPEG image

Select the time range to plot

Plot from a specific start time to the end of the log file:

osnma_log_viewer.py gnss-sdr.log --start "2025-08-26 10:35:00"

Plot from the beginning of the log file to a specific end time:

osnma_log_viewer.py gnss-sdr.log --end "2025-08-26 10:40:00"

Plot between a specific start and end time:

osnma_log_viewer.py gnss-sdr.log --start "2025-08-26 10:35:00" --end "2025-08-26 10:40:00"

If --localtime is passed, the --start and --end date-times are interpreted in the local time zone.