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Time between request and receive varies

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I got some Zigbees S2C and trying to do some distance measurements with it.
I have tried the RSSI option, and got some decent results (+- 2-5m) but not where i am aiming for (+- 0.5-1m).

Second option is Time of Flight. But i got variations within the request and receive time.
Examples of measured times:

So is varies with like 1mS. Any idea where this difference come from and if this can be reduced?
asked Jul 7, 2020 in DigiMesh Proprietary Mesh Networking by 414184 New to the Community (2 points)

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2 Answers

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Most part of time taken between serial input on Tx module and serial output on Rx module is consumed in processing of data by modules.

Therefore, this makes distance calculation based on transmission time, not a practical application with these units.

Digi Support
answered Jul 9, 2020 by mathur Veteran of the Digi Community (289 points)
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I understand that part.
But why does that time vary?

I dont mind that there is a delaying time. I can put that delaying time in my calculations. But why does it vary by 1mS?

answered Jul 9, 2020 by 414184 New to the Community (2 points)