Ecosyste.ms: Awesome

An open API service indexing awesome lists of open source software.

Awesome Lists | Featured Topics | Projects

https://github.com/rokubun/android_rinex

This repository contains a python script that converts logs from Google's GNSS measurement tools to RINEX
https://github.com/rokubun/android_rinex

Last synced: 3 months ago
JSON representation

This repository contains a python script that converts logs from Google's GNSS measurement tools to RINEX

Awesome Lists containing this project

README 

        
Android GNSS Logger to RINEX converter

======================================



This repository contains a Python script that converts logs from Google's GNSS

measurement tools to RINEX



The repository for the GNSS measurement Android app can be found in this link:



https://github.com/google/gps-measurement-tools



Once installed in your Android device, the app will log GNSS measurements

and will write a text file with the GNSS measurements. There is a file in

the `data` folder that contains an example data file collected with a Nexus 9

tablet:



    data/pseudoranges_log_2017_07_17_13_46_25.txt



This file can be used with this tool to generate a RINEX file that can be

then used in GNSS data processing software such as e.g. RTKLib.



Standalone test

------------



If you are developing the code it might be easier to run it as a standalone library.



* in Linux this can be done via

    ```

    export PYTHONPATH=$PWD;$PYTHONPATH

    bin/gnsslogger_to_rnx

    ```

* in Windows, most of the time PYTHONPATH is not set so its easier to use batch file



    gnsslogger_to_rnx.bat -o nex91980.17o .\data\pseudoranges_log_2017_07_17_13_46_25.txt



That is



    gnsslogger_to_rnx.bat -o OUTPUT FILE INPUT FILE



Installation

------------



This package has been built using Pyhton's setuptools. As such, you can 

install it into your system by issuing the command



    python setup.py install



You might need the root password to issue this command. Alternatively, you can

install in a non-default directory by specifying the install path with the 

`--prefix` option:



    python setup.py install --prefix /path/to/instal



Examples

--------



The script has a small help that explains the different options of the 

program. This help is accessed through the command:



    gnsslogger_to_rnx -h



There are several options that allow the user to change several standard

RINEX fields ('MARKER NAME', 'RECEIVER TYPE', ...)



Some execution examples follow:



(a) Process the data file and generate a RINEX file in the standard output 

    (discard the error messages)



    gnsslogger_to_rnx data/pseudoranges_log_2017_07_17_13_46_25.txt 2> /dev/null



(b) Process the data and save the results into a specified file name (and 

    disregard warning messages)



    gnsslogger_to_rnx -o nex91980.17o data/pseudoranges_log_2017_07_17_13_46_25.txt 2> /dev/null



(b) Process the data, trying to "integerize" the observations to the nearest

    time stamp (i.e. integerize the time stamp to the closest second and

    modify the pseudorange uaing the PseudoRangeRateMeterPerSecond measurements=.

    Note: this option does not touch the carrier phase. In theory the same could

    be done to the phase, but strictly speaking we would need the Doppler. not

    the PseudoRangeRate measurements.



    gnsslogger_to_rnx -i -o nex91980.17o data/pseudoranges_log_2017_07_17_13_46_25.txt 2> /dev/null



    This option might be useful to process data from various smartphones at 

    once.



(d) Process the data and generate a named RINEX data but maintaining 

    constant the 'FullBiasNanos' instead of using the instantaneous value.

    This avoids the 256 ns jumps each 3 seconds that create a code-phase

    divergence due to the clock.



    gnsslogger_to_rnx -b -o nex91980.17o data/pseudoranges_log_2017_07_17_13_46_25.txt 2> /dev/null