Method for determining position information, position determination system and medical device describing a relative position between two relatively movable units

摘要

Method for determining a position information describing a relative position between at least two relatively movable units (6, 7), characterized in that one of the units (7) emits an acoustic signal by means of at least one electro-acoustic transducer (8) and the other of the Units (6) by means of at least one electro-acoustic transducer (9) receives the acoustic signal, wherein the relative position information is determined by evaluating at least one time value with respect to the received signal, wherein by means of at least one receiving transducer (9, 19) ambient noise measured and evaluated be adapted to at least one property of the acoustic signal for better measurability of the acoustic signal by the receiving transducer (9) in dependence on the evaluation result of the ambient noise.