internal gps rtk

[Stefan Moisei]

Hello,

Does anyone know why since the raw internal gps mesurement has been introduced in android in 2018, no ap has taken advantage of it by implementing rtk or some other corrections. Is it simply because no one bothered to do it, or are there any technical factors I have overlooked? Google implemented some kind of 3d aided corrections, using 3d maps of cities. Did they not choose rtk because building rf reflections in cities would have made it ineffective?

thanks.

[gpsfan]

Good question...there might be some Pro apps out there. As for "consumer" apps the market is probably close to...zero ! Apart from here and a couple of threads on XDA the silence is deafening ;-)

There was an app callez PPP WizLite that specifically used the new GNSS raw measurements made available in Android in 2018 but it's no longer available for download. It was just a demo though, you couldn't log any data.

[Валерий Заподовников]

Oh, but that is the beauty of Android, you can always get the deleted apps, like https://play.google.com/store/apps/details?id=jocs.fr.gnss_ppp by going to https://apkcombo.com/ru-ru/apk-downloader/?device=&arches=&sdkInt=&sa=1&lang=en&dpi=480&q=jocs.fr.gnss_ppp for example.

The classical way to operate rtk stuff is rtklib though. https://github.com/tomojitakasu/RTKLIB/tree/rtklib_2.4.3

воскресенье, 24 января 2021 г. в 00:03:04 UTC+3, gpsfan:

[gpsfan]

Yes I'd ended up finding the .apk but it's not quite clear what that app is doing TBH ;-)
I've also post-processed Rinex files recorded on the Mi 8 with rtklib (and using a CORS station) but I haven't been able to get a "fix", it's been a "float" so far only and a static accuracy of about 2 meters when comparing to Google Earth, the statistical accuracy is a lot better though. For dynamic data it's pretty much unusable compared to the output you get in a navigation app, like Locus for instance.
Have you had better luck yourself ?

[Stefan Moisei]

The problem with rtklib is that it doesn’t support internal receiver, even though it could.

Maybe that app had a server or something which has been taken down, it doesn’t seem to work for me.

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[gpsfan]

Maybe one of the reasons that no high accuracy, i.e. RTK apps have been developed to leverage the Dual Frequency phones is that the results are not great as anyone who's experimented with PPK will have noticed. Don't take my word for it, there are a bunch of research papers out there and an interesting article called " A first look at the Broadcom BCM47755 dual-frequency receiver " here https://rtklibexplorer.wordpress.com/2019/08/28/a-first-look-at-the-broadcom-bcm47755-dual-frequency-receiver/