Sonic ranging/detection system employing varied beamwidth

Details Sonic ranging/detection system employing varied beamwidth Sonic ranging/detection system employing varied beamwidth

1982-11-01

1985-11-05

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367103, 367116, G01S 1514, G01S 752

Patent

active

045518254

ABSTRACT:
A sonic ranging and/or object detection system, particularly useful for the blind, periodically employs widely different pulse frequencies in order to distinguish between objects located directly in front of the energy transmitting portion of this system and those located to either side. The higher frequency pulses produce a relatively narrow sonic energy beam width for detecting centrally located objects and the lower frequency pulses produce a relatively broad sonic energy beam width for detecting lateral or off-center objects. One or more time-related audible tones are superimposed on each of the pulse frequencies for range determining and/or object distinguishing purposes.

REFERENCES:
patent: 3321737 (1967-05-01), Russell
patent: 3366922 (1968-01-01), Kay
patent: 3757285 (1973-09-01), Ferre
patent: 3943482 (1976-03-01), Murphree et al.
patent: 4199246 (1980-04-01), Muggli
patent: 4280204 (1981-07-01), Elchinger
Kuhl et al., Acoustica, vol. 4, No. 5, 1954, pp. 519-532.

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