Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1978-06-15
1980-12-16
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367112, 367909, G01S 1542, G01S 1593
Patent
active
042401526
ABSTRACT:
A system for locating and determining the distance to an object with respect to a movable vehicle is provided which utilizes at least three transducers wherein at least two of the three transducers operates either as a receiver transducer, in which case the remaining transducer operates as a transmitter transducer, or two of the three transducers operate as transmitter transducers in which case the remaining transducer operates as a receiver transducer with the system also including means for sequentially operating the three transducers for sending and receiving reflected ultrasonic signals to simultaneously determine both the location and distance of persons or objects with respect to the transducers.
REFERENCES:
patent: 3528053 (1970-09-01), Rubin
patent: 3539978 (1970-11-01), Stedtnitz
patent: 3705772 (1972-12-01), Andreas
patent: 3842397 (1974-10-01), Sindle
patent: 4015232 (1977-03-01), Sindle
patent: 4045766 (1977-08-01), Iida et al.
patent: 4119939 (1978-10-01), Katakura
Duncan Robert L.
Wiley Paris H.
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