Method for measuring the distance and/or the relative velocity between two objects
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United States of America Patent
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Jul 25, 1989
Grant Date -
N/A
app pub date -
Jul 21, 1987
filing date -
Dec 12, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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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