Hi securigy,
the reason of inaccuracy you have measured is due to the antenna radiation pattern.
Physically it is impossible to create a perfect omni-directional flat antenna, in this case PCB antenna. So depends on the orientation the distance measurement might differs resulting in errors in position estimation.
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The antenna calibration has been done between two nodes with antenna pointing face-face. If you measure the distance between Anchor-Tag you should get the accuracy described in the Application Notes.
I think you are mixing 2 accuracy terms together. Distance accuracy should be as mentioned in the Application Notes. Position accuracy is a combination of errors in: all distance measurements, anchor positions, location engine. -
DWM1001 - all modules have been calibrated as mentioned above. DWM1000 - I don’t know.
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Again, if you talk about distance measurement then you need to define the antenna orientation. Or you need to use another antenna, see this post: Antenna orientation Calibration
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No, it should not.
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The accuracy of distance or position? See my response above.
Cheers,
TDK