Minimum ranging distance

What is the minimum distance between two DWM1001 modules that can have the distance between them calculated?
In our application, we have one module mounted on a mobile device and another attached to a table. At full transmit power, they have to be at least 18" apart to report the range. At minimum power, they work when they are at least 10 inches apart. We would like to get the distance when they are as close as 4". Is there anyway to accomplish that?

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I Have the same question. Im using the PANS Software. 30 cm is the minimum Distance. Also i have a negative Offset of 10cm in short Distances (Until several meters of Distance) Can someone explain why it is negative ? Does it has to do With the TWR ?

I have the same problem. Does anyone know what causes the decrease in uwb ultra close communication accuracy?