GNSS data processing scripts

GNSS data processing scripts are a collection of Python scripts for analyzing Android GNSS data.

Requirements

To use the program, you must have at least Python 3.9, installed coordinates.converter, and numpy.

Configuration

Change values in configuration.yaml file to match your needs. main.py uses those values.

Input folder

Make an input folder and nest a date folder (matching the one in configuration.yaml), that includes Android GNSS raw data log (.txt), post-processed Android GNSS data from RTKPOST (.pos), and reference data from u-blox (.ubx) by date (dd_mm).

gnss_data_processing_scripts
|--automated_calculation
    |--input
        |--dd_mm
           |--raw_data_001.txt
           |--processed_data_001.ubx
           |--reference_data_001.pos
        |--dd_mm
           |--raw_data_002.txt
           |--processed_data_002.ubx
           |--reference_data_002.pos

NB! If you don't provide all 3 files then script won't calculate results. It will still convert all of the provided files into csv. format.

Output files

Ground_truth_{date}_{location}.csv File contains

• rover latitude/longitude WGS84 coordinates
• datetime stamps (secong accuracy)

{device}Fix{provider}{date}{location}.csv File contains

• rover Fix latitude/longitude WGS84 coordinates
• datetime stamps (secong accuracy)
• number of satellites seen using Galileo E1 frequency in current epoch
• number of satellites seen using Galileo E5 frequency in current epoch
• number of satellites seen using GPS L1 frequency in current epoch
• number of satellites seen using GPS L5 frequency in current epoch
• Average of Cn0DbHz in current epoch
• Pseudorange rate meters per secong average in current epoch

{device}pos{provider}{date}{location}.csv File contains

• rover latitude/longitude WGS84 coordinates
• datetime stamps (secong accuracy)

{device}{date}{location}_analysis.csv This file is a combination of processed android GNSS data and ground truth information. Coordinates or provided in L_Est97 format.

Results_{constellations}{device}{date}_{location}.csv In this file you can see the calculation results (standard deviation and mean error between rover and ground truth)

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.