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Are there any known procedures for calibrating a precise position of an external processing/display device (e.g. a smartphone or a tablet) relative to the GNSS receiver?

Apparently, such a procedure is unnecessary when the display/processing unit is mounted on the pole in a fixed position like this:

fixed mounted processing unit

However, if the distance between the receiver and the processing unit is not fixed, how does one handle measurement and calibration of this distance? Imagine, for example, a surveying session when one has to walk around the area holding only the display/processing unit in their hands, while the receiver position does not change (think underground utility mapping).

Or, when a GNSS receiver is mounted in a backpack like this:

example

When we talk about centimetre accuracy, any hands and/or backpack movements will introduce a measurement error. Of course, most of the tablets/smartphones have IMUs whose readings should help make necessary adjustments, but the question of initial distance calibration remains open.

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