Sonic ranging systems to eliminate errors due to variations in t

Details Sonic ranging systems to eliminate errors due to variations in t Sonic ranging systems to eliminate errors due to variations in t

1978-03-13

1980-07-01

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

73290V, 367902, 367908, G01S 968

Patent

active

042109698

ABSTRACT:
An improved sound ranging system increases the precision of range measurement by automatically correcting for any variation in the velocity of sound in the medium. The automatic correction for the sound velocity utilizes a small sound reflecting target located at a precise fixed distance from the transducer surface. A digital circuit, including a microcomputer, improves the measurement accuracy of the system. The invention includes a time delay and sensitivity control in one of the two time measurement circuits employed in the system to prevent "ghost" signals caused by multiple round-trip target reflections from introducing errors in the range measurements.

REFERENCES:
patent: 2753542 (1956-07-01), Rod et al.
patent: 3123797 (1964-03-01), Ehrman
patent: 3184969 (1965-05-01), Bolton
patent: 3290490 (1966-12-01), Auer, Jr.
patent: 3394589 (1968-07-01), Tomioka
patent: 3745829 (1973-07-01), Franchi
patent: 3834233 (1974-09-01), Willis et al.
patent: 4145914 (1979-03-01), Newman

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