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barbeau / gpstest

The #1 open-source Android GNSS/GPS test program
Apache License 2.0
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How to check if there is dophler effect support by the device? #388

Closed avkonst closed 4 years ago

avkonst commented 4 years ago

Summary:

Just a question. Want to review how accurate speed measuments by my phone.

Expected behavior:

Would like to see if the devices measures the speed using dophler effect or not.

Device and Android version:

Armor X5, android 9

barbeau commented 4 years ago

Unfortunately Android doesn't provide any indication for how speed is calculated. You can look at the S. Acc field to get some idea of speed accuracy (https://developer.android.com/reference/android/location/Location#getSpeedAccuracyMetersPerSecond()):

We define speed accuracy at 68% confidence. Specifically, as 1-side of the 2-sided range above and below the estimated speed reported by getSpeed(), within which there is a 68% probability of finding the true speed.

avkonst commented 4 years ago

Thanks for the answer. Very nice. I can benchmark 2 phones now. One is clearly better. I am going to compare my best mobile phone with the gps speed watches which are used during Luderitz windsurfing speed challenge. It will take some time with this virus lockdown. I can post here the update if you are interested in.

barbeau commented 4 years ago

Yes, please share results!