Phase Slope Calculation in distance measurement webinar

[Runnit]

Hey,

I am planning on using the Nordic SDK for some distance measurements between two nRF52840 boards. 

For my documentation I would also want to understand how the technology works. I was following the Webinar on the different distance measurement methods (Phase Slope, IFFT, High Accuracy, RTT) but I do have some questions.

How is the phase slope calculated from the phase difference? In the presentation slides the phase difference is 0.52pi (for a distance of 2m) but the diagram in the following slide shows completely different values on the y-axis (here 1.39m and 2.69m). What is shown on that y-axis and how do I get from the phase difference to the graph?

Also, are there any more documentations on the IFFT and the High Accuracy methods? How do they work?

Thank you!

[Runnit]

These are the slides I was talking about.

And here is the full slide set:

6710.Measuring_distance_with_Nordic_Distance_Toolbox_slides.pdf

[ketiljo]

There's not much additional info, but you can find more here: https://ieeexplore.ieee.org/search/searchresult.jsp?newsearch=true&queryText=phase-based%20ranging%20BLE