Patent ID: 7245252

Claim:
A method for determining the distance between two transmitting and receiving stations ( 1 , 2 ), characterized in that in each transmitting and receiving station ( 1 , 2 ) a transmission signal (S 1 , S 2 ) is generated and is transmitted as a series of microwave pulses having a predefined pulse repetition frequency (fp 1 , fp 2 ) to the respective other transmitting and receiving station ( 2 , 1 ) and is received thereby in the form of a received signal (E 2 , E 1 ), said pulse repetition frequencies (fp 1 , fp 2 ) of the transmission signals (S 1 , S 2 ) varying according to a predefined differential frequency value (fd), in each transmitting and receiving station ( 1 , 2 ) the coincidence of pulses of the transmission signal (S 1 , S 2 ) sent by the respective transmitting and receiving station ( 1 , 2 ) and the received signal (E 1 , E 2 ) is detected as a coincidence event, for each transmitting and receiving station ( 1 , 2 ) two numbers of pulses (m(i), n(i), p(j), q(j)) allocated to the respective transmitting and receiving station ( 1 , 2 ) are determined, which as a transmission pulse number (m(i), q(j)) and as a received pulse number (n(i), p(j)) represent the number of the pulses transmitted and received by the respective transmitting and receiving station ( 1 , 2 ) at the point in time of a coincidence event, the distance between the transmitting and receiving stations ( 1 , 2 ) is calculated from the numbers of pulses (m(i), n(i), p(j), q(j)).