GNSS Compare
GNSS Compare is the winning Android application developed by the Galfins Team (https://gnss-compare.readthedocs.io/en/latest/team.html) as part of the internal European Space Agency (ESA) competition called Galileo Smartphone App Challenge introduced in October 2017. Furthermore, the competition was supported by the European Commission (EC) and European GNSS Agency (GSA). The Challenge was about creating a smartphone application, which will allow the user to choose which satellite constellation to use for Position, Velocity, and Time (PVT) estimation. The aim was to increase the awareness about the European Union’s Galileo satellite navigation programme and also to allow users from common public to view and use Galileo signals.
The current features of GNSS Compare include:
- Open-source code on github: https://github.com/TheGalfins/GNSS_Compare
- Online documentation: https://gnss-compare.readthedocs.io
- Modular software framework for extending GNSS Compare’s PVT algorithms
- Supported GNSS constellations: Galileo only, GPS only, Galileo&GPS combined
- Support for dual-frequency receivers
- Available PVT estimators: Weighted Least Squares, Extended Kalman Filter
- Data logging formats: Simple Logger (UTC timestamp, X, Y, Z), NMEA (UTC timestamp, lat, lon, alt, CN0), Raw GNSS measurements (Google’s GnssLogger format)
- note: all calculations are initialized with phone's FINE location
Please note that for this application to work properly, your phone needs to support both the Galileo Satellite System and Android raw GNSS measurements.
The list of Galileo compatible phones can be found here: https://www.usegalileo.eu/EN/inner.html#data=smartphone.
The list of phones supporting Android raw GNSS measurements can be found here: https://developer.android.com/guide/topics/sensors/gnss.
So far we’ve been testing the application on:
- Samsung Galaxy S8
- Samsung Galaxy S8+
- Xiaomi MI8
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Acknowledgements:
GNSS Compare’s developers would like to thank the European Space Agency for the continuous support throughout the development of this application. Especially we would like to mention the ESA employees that shared their experience and knowledge regarding the Dual-Frequency aspects: Paolo Crosta, Nityaporn Sirikan, Gaetano Galluzzo, Paolo Zoccarato, and Tim Watterton.
Category : Education
Reviews (23)
There's something wrong with the app as the message "failed to download ephemeris" keeps popping up as others have noted. I have a Mi 8 which the developers claim has been tested to work, this is incorrect at the time of this review (02/21)
Garbage app that does not work. Opens and hangs at White or black screen. Even causes phone to become unresponsive.
The concept is nice, would be useful to compare GPS versus GLONASS v.Beidou v.Galileo. Unfortunately not working on my ZenFone 5Z (ZS620KL), although I can use it to receive Galileo with other apps.
Have a samsung galaxy note 10 plus, on startup goes to a white screen and stays there. totally useless at the moment. will revise if i have a reason to.
Installed on my Galaxy S6. I could not receive any data from any satellite group. Strange as GPS Test works fine though it does not display Galileo the Galileo constellation.
There's years of complaints about the ephemeris errors. It's still happening, making the app unusable.
Fails to get emphemeris data. Samung Galaxy S9+. Seems to be the same issue with the rest of the comments.
Does not work on my phone, despite that the phone is on that list of Galileo capable phones. BQ aquarus X.
Repeatedly crashes on startup after permitting required permissions. Galaxy s20, android 11.
Doesn't download emphemeris data on my OP5 either, I'd be willing to try and help the devs sort out the issue if that'd help
Keeps crashing on android 11.
The app works on my Huawei p10+, running Android 8.
Doesn't run on Android 11.
On my Huawei mate 10, it does not find any Galileo satellites
This is perfect! Best of luck!
Doesn't even open on a Samsung S10
It doesn't download emphemeris data. It is retrying without luck :(
No satellites found !
Detects Galileo signal but doesn't download the ephemeris on my Mi 9.
This app will not load on my android phone
BROKEN 💔 need updated version.
A lot of work and effort have been put in order to bring GNSS Compare to the store. We do believe in its usefulness for the Android GNSS raw measurements processing research, development and education. Any feedback is highly appreciated!
Fails to get Ephemeris data (see other reports of this) and on my Google Pixel 3 / Android 9 (bought specially because it was listed as compatible) whilst the GPS Status app shows E satellites (Galileo), your app shows something for Galileo satellites for a second or two on the opening screen, they quickly revert to all zeros. Please fix this - I'm happy to test a beta.