RE: bt6.0 channel sound distance calculation

Elfving — Thu, 20 Nov 2025 10:29:45 GMT

Hi,

[quote user="qingsong"]Does the product need to be calibrated before leaving the factory?[/quote]

Not necessarily, you might want to calibrate the clock and write to the UICR or something though.

Regarding the rest, it is true what witc says below here.

The printed value you get the there are acctually 3 attempts at getting the real value; the numbers there are guesses at the range, in meters. First of all, we need to keep in mind that CS isn't UWB; the best you can expect is ±0.5m. Differentiating between ±0.5m would be impossible/hard. But you can differentiate better than what the sample is currently doing - the sample is more of a demo of the underlying technology, giving you the ingredients to make something out of yourself.

Secondly, it is tempting to simply say that you should disregard anything but the IFFT measurement - which I would also claim performs ok-ish in the tests you've shown. However, the truth is rather that all of these metrics work best in different situations. RSSI is okay in short range for instance, and RTT is best for very long ranges. This old webinar (which is meant to describe how our old "Distance Toolbox" worked, but the tech is almost the same) goes a bit further into the details of what separates these measurements. Another thing I just realized when finding the webinar now is that phase slope might get you a max range, but don't quote me on that.

Most importantly: if you really want a good accuracy for your product, what you would typically do is to buy a third party algorithm that gets you a better accuracy than what our free code does. I assume the better algorithms combine all of these metrics in some fancy way. If you contact your local regional sales manager I bet he would be able to put you in contact with someone selling third party CS

Regards,

Elfving

RE: bt6.0 channel sound distance calculation

qingsong — Thu, 20 Nov 2025 07:54:25 GMT

Does the product need to be calibrated before leaving the factory?

RE: bt6.0 channel sound distance calculation

qingsong — Thu, 20 Nov 2025 07:53:02 GMT

are you some suggest?

RE: bt6.0 channel sound distance calculation

witc — Wed, 19 Nov 2025 14:42:37 GMT

Here I guess each must find their own way to combine these values. Kalman filter, weighted average, median...?