when i try to use the ddfs to calculate the distance, i can't understand the comments in the README file,
"Zero-distance calibration
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The measured values of distance measurement include an offset.
The offset value may depend on the design of the radio circuit, the antenna used, or the PCB layout.
When using a library and a sample, you need to compensate the zero-distance offset and perform the calibration manually.
To determine the offset value, place the devices at a reference distance of 60 cm from each other and collect a batch of measurement data.
The difference between the average measurement value and the actual distance can be used as an estimate of the offset."
Appreciate if you can provide your valuable comments
Thanks