Communications – electrical: acoustic wave systems and devices – Distance or direction finding – With time interval measuring means
Patent
1990-10-22
1992-08-25
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
With time interval measuring means
367907, G01S 380
Patent
active
051425068
ABSTRACT:
A positional locating method and apparatus (10) for measuring distances by accurately determining the transit time of ultrasonic wave bursts (22) between two or more points is disclosed. Timer clocks (60), (62), (64) and (66) are started when each of the bursts (22) is triggered to be emitted from a transmission point (14), and are stopped when a highly defined point (56) in the burst (22) is received at a corresponding receiving point (32), (34), (36) and (38). The highly defined point (56) is determined by first analyzing the burst (22) to identify a particular cycle (54) within the burst (22). That particular cycle (54) is then analyzed to detect the specific point (56) within the cycle (54). Use of multiple transmitters (9312), (9314) and (9316) or receivers (932), (934) and (936) permits the dimensions using ordinary trigonometric calculations. The calculation of position within two or three physical inventive method also has sufficient resolution to permit the calculation of attitudinal data by detecting very fine positional differences in a plurality of reference points located at relatively close distances on a movable marker device (912).
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Logitech Inc.
Pihulic Daniel T.
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