Importance

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Abstract

A method for determining a mutual position between two objects, comprising transmitting a microwave signal from the first object towards the second object, causing the second object to receive the transmittal signal and re-transmit a signal, which is caused to be received by the first object. According to the invention the first object includes a transmitter/receiver unit (S/M-unit), which transmits the aforesaid signal (f.sub.o) from a transmitter antenna. The second object (T) is caused to re-transmit the aforesaid signal modulated with a signal (f.sub.m), the first object being caused to receive the transmitted signal through at least two antennae (M.sub.1, M.sub.2) placed symmetrically on a respective side of the transmitter antenna (S) and in an antenna plane common with the transmitter antenna (S). The angle (.theta.) between the antenna plane and the second object, at least in one dimension, is determined by a phase comparison or an amplitude comparison of received signals, in dependance on whether or not the second object (T) is located in the so-called proximity zone of the first object. The invention also relates to apparatus for carrying out the method.

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First Claim