Arrangement for calibrating a radio system

Arrangement for calibrating a radio system for determining the position of at least one mobile station in a three dimensional space with a plurality of receivers, of which at least one (2) is fixed to a fluctuating due to environmental influences construction, and with a system for determining the movement of the fluctuating construction, at least three reference transmitter (4), each with a known and fixed position whose transmission signals are received with a defined carrier frequency from the receiver to the varying structure and an evaluation device comprises formed, received from the receiver (2) transmission signals of the single reference transmitter (4 ) to determine, taking into account the carrier frequency defined phase measurement values ​​from which the distance in each case to the reference stations (4) and the change in position of the receiver (2) and thus the fluctuating construction can be calculated, wherein the evaluation device is further designed to to take account of the change in position secured to the receiver structure (2) in determining the position of the mobile transmitter.