Support for Gnss measurements

Navroop Singh

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Oct 21, 2021, 12:13:39 PM10/21/21

to GPSTest

HI,

I'm looking for some kind of support platform for queries related to Gnss measurements, GnssClock code usage for GPS time. I have some queries regarding various variables within the class and what timestamps do they provide.

Thanks

Navroop Singh

Sean Barbeau

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Oct 21, 2021, 12:15:42 PM10/21/21

to Navroop Singh, GPSTest

Navroop,

Are you using these in your own app?

I assume you've looked at the Android documentation?

If you outline your exact questions with some examples of the APIs you're using and the data you're seeing maybe someone in the group can help.

Sean

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Navroop Singh

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Oct 21, 2021, 12:34:09 PM10/21/21

to Sean Barbeau, GPSTest

Hi,

Thanks for the reply

I followed this documentation for implementing the code for getting trueGPStime:

https://developer.android.com/reference/android/location/GnssClock

So, I created a cordova plugin to implement the native code for my own app with a javascript interface, here's the github link :

https://github.com/navroopsinghsandhu/GnssClockPlugin

The code is under development.

So, I'm getting following values:

mTimeNanos = -9223372000000000000

mFullBiasNanos = -9223372000000000000

mBiasNanos = 0

So, as we know, gps time is calculated as:

trueGpstime = mTimeNanos - (mFullBiasNanos + mBiasNanos)

So, I'm getting final gpstime as:

trueGpstime = 0

Note: I tested this on Samsung galaxy A20

I would like to know what's causing it to give me zero gpstime. Please let me know if anyone can help.

Also I would like to know, what other variables represent such timestamps that could be helpful in any way