Accelerometer data colibration

[winice-test]

Platform your question concerns:

• [* ] Android
• [ ] iOS
• [ ] Other
• [ ] Platform is not relevant for this question

Device:

• [ ] Polar OH1
• [ ] Polar Verity Sense
• [ *] Polar H10
• [ ] Polar H9
• [ ] Other
• [ ] Device is not relevant for this question

Description: I would like to study my running dynamic data. I tried ot read the accelerometer data from Polar H10. Now I can get those data. And I also reordered the data so that X means move forward, Y means move left/right and Z is upside (Gravity is in the opposite direction).

After some seconds, I can always find X/Y is not zero even I sit at the same location without any movement. Do we need to do some colibration after get the data from sample?

Attached is a sample curve after 10s.

[winice-test]

I think I have some idea now. But further guidance is still appreciated. Thank you.

The problem is that I need to do some projection so that the Gravity is exactly 1.0. Then the rest direction can be computed.