Communications – electrical: acoustic wave systems and devices – Distance or direction finding – With time interval measuring means
Patent
1990-07-12
1992-06-16
Williams, Hezron E.
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
With time interval measuring means
73597, G01S 3801
Patent
active
051229919
ABSTRACT:
A distance measuring apparatus and method using an acoustic signal. It includes a transmitting probe for transmitting an acoustic signal from a transmitter, a plurality of receiving probes having resonance frequencies different from the central frequency of the signal transmitted from the transmitting probe, and a control circuit for controlling the functions of those probes. The acoustic signal is received by a receiving probe having a resonance frequency which provides the maximum received-signal sensitivity at the central frequency of the received acoustic signal under the control of the control circuit to thereby measure a long distance accurately.
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patent: 4446740 (1984-05-01), Wilson et al.
patent: 4914642 (1990-04-01), Fraser et al.
Furukawa Toshiyuki
Kajiyama Sigeru
Koike Masahiro
Sawa Toshiyuki
Takaku Kazuo
Finley Rose M.
Hitachi , Ltd.
Williams Hezron E.
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