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I am currently working with QField on my tablet (Samsung Galaxy Tab S5e) and my smartphone (Samsung Galaxy A40). Since the positioning accuracy on my devices is rather low (absolute best case ~3m on an open field with clear sky), I am looking for lowcost ways to improve it in real time. Due to the high costs, I don't want to use an external GNSS receiver.

I've read that with RTK networks accuracies can be improved to sub-meter levels if you have raw measurements from your GNSS receiver, use a Ntrip-client and have access to correction data. This discussion: GNSS raw measurements on Android: Does real time/post processing Differential techniques possible?, and this article and the corresponding video: https://www.gpsworld.com/how-to-achieve-1-meter-accuracy-in-android/; https://www.youtube.com/watch?v=vywGgSrGODU gave me an overview of the topic, but I am still missing some things:

In the mentioned article/video from 2018 it says that there might be apps in a few years which will offer high-accuracy positioning with your smartphone. Does anyone know of an app that has been developed in the meantime and that achieves sub-meter accuracies with the GNSS-data received from a smartphone?

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  • Positing that kind of technology change that far out sounds more fanciful than predictive.
    – Vince
    Apr 27, 2021 at 0:49
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    Even without looking at carrier phase, you could still use differential GPS. Use 2 phones. Leave one at a known location nearby as a base station. As the mobile unit moves, its changes are are a sum of actual movement and path difference due to atmospherics. The base unit will only respond to the atmospherics, which it can time-tag and store or send as a correction. Average the long-term data recorded at the static base station to get a more accurate position of the base, and therefore the mobile unit, post-mission (over coffee).
    – wingnut
    Apr 27, 2021 at 7:44

2 Answers 2

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This thread on the GPSTest Google Group discusses this topic: https://groups.google.com/g/gpstest_android/c/uT2fmvu7ktA

That thread lists several apps, although I don't know if any of them have definitively proven sub-meter accuracy:

I've been tracking open-source GNSS apps here:

https://github.com/barbeau/awesome-gnss#android-apps-open-source

...but I don't know of any that have proven sub-meter accuracy using integrated GPS.

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Try mobile topographer it's very good for your situation.

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