Patent ID: 8738028

Claim:
Method for detecting a movement of at least one receiver, in which radio signals are transmitted from at least one stationary transmitter to said least one receiver and the received signals are evaluated in order to establish a movement, the radio signals being designed as a prescribed bit sequence which is modulated onto a high-frequency carrier and being demodulated by the receiver in order to form a received sequence which is correlated for determining correspondences with the prescribed bit sequence stored as reference sequence, wherein the prescribed bit sequence is chosen such that, for an autocorrelation function, a pronounced maximum with a large spacing relative to one or more secondary maxima is produced and the maximum is stationary even with interferences, wherein quality constants for the received field strength of the received radio signals are determined as a function of the height of the correlation maximum in connection with spacing relative to a secondary maximum established by the correlation of the received sequences with the reference sequence, and wherein the radio signals with the prescribed radio sequence are transmitted in series from the transmitter at at least two different transmission powers and the series is repeated at temporal intervals and the quality constants of the received sequences of the series are evaluated in order to establish a movement of the receiver with respect to the transmitter.