| 摘要 |
PCT No. PCT/SE86/00569 Sec. 371 Date Jul. 21, 1987 Sec. 102(e) Date Jul. 21, 1987 PCT Filed Dec. 11, 1986 PCT Pub. No. WO87/03697 PCT Pub. Date Jun. 18, 1987.A method of measuring the distance between two objects and/or the speed of one object in relation to the other, the objects incorporating respectively a transmitter-receiver unit and a transponder or reflector, in which method a phase comparison is made between a signal transmitted by the transmitter-receiver unit and a signal received in the transmitter-receiver unit and transmitted from the transponder or reflector. In accordance with the invention the transmitter-receiver unit is caused to transmit signals of microwave frequency, preferably about 2450 MHz, this transmission comprising the transmission of a first signal having a first frequency, the transmission of at least one second signal having a higher or lower frequency, and the transmission of a third signal having the same frequency as the first mentioned signal, wherewith the phase differences phi between the transmitted signals are formed, these phase differences corresponding to the distance between the transmitter-receiver unit and the transponder.
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