Nordic Distance Measurement MCPD Algorithm

[ethan-l]

Hi，Recently I have been using the Distance Measurement Demo. When I use MCPD,There are three ways to calculate distance:ifft,phase_slope,rssi_openspace.Among them, I have seen the relevant explanation of phase_slope in the official PPT, And as far as I know rssi is not related to phase ranging and only make rough estimates. As for ifft, I haven't seen any introduction to the principle. So,I have some questions:

• What is the principle of ifft, Is it also calculated based on phase information?

• Why are these three algorithms used at the same time, even though they seem to work differently？

• I see the final result as "best", always consistent with iffi，why?

 

[ovrebekk]

Hi 

What is the principle of ifft, Is it also calculated based on phase information?

I don't think we document this algorithm anywhere, but I will do some checking internally and get back to you. 

Why are these three algorithms used at the same time, even though they seem to work differently？

The different algorithms might perform differently in different situations, at different ranges and so forth, and there is some value in getting results from all of them. 

I see the final result as "best", always consistent with iffi，why?

The IFFT based algorithm is the most accurate one, and it is to be expected that this algorithm would provide the best results most of the time. 

Best regards
Torbjørn

[ethan-l]

Thanks for your reply. look forward to hearing more from you after checking.

[ethan-l]

By the way, is high_precision also an algorithms like ifft ?

[ovrebekk]

Hi

The high_precision algorithm is based on the super resolution principle, meaning oversampling is used to increase the resolution of the signal. 

A more detailed description is not available unfortunately. 

Best regards
Torbjørn