The home point is automatically updated when the GPS in the drone has good enough sattellite reception and knows where it is located. You can change the homepoint during flight, but you need to be aware of what that means.
As for calibrating the...
You probably think of DJI Aeroscope, a drone detection system launched in 2017. They sold a lot of it (very expensive) to law enforcement, airports and military. I think they have stopped making them now. Here is a quote from DJI:
"Every DJI...
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