I’m currently investigating the clock drift during single-sided two-way ranging with two dw1000.
The manual proposes two different methods to compensate the clock-offset between receiver and transmitter:
- Carrier Recovery Integrator (see page 148, UserManual Version 2.14)
- Receiver Time Tracking (see page 99, UserManual Version 2.14)
My observations indicate that both methods give a good estimation of the clock-offset. However the first method seems to be a little bit better.
Now my question: Does anybody know how the dw1000 estimates the clock-offset? Why is there a difference between both estimations?
Thanks in advance
I think i found the answer. The Carrier Recovery Integrator seems to be a result of the coherent analysis. The receiver time tracking seems to be a estimation based on the technique also suggested by the IEEE 802.15.4 standard. The values of the Carrier Recovery Integrator works better for me.