Communications – electrical: acoustic wave systems and devices – Echo systems
Patent
1986-12-04
1989-01-24
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Echo systems
367 93, G01S 966
Patent
active
048005401
ABSTRACT:
This invention uses an ultrasonic transmitter and receiver and a microprocessor to detect the presence of an object. In the reset mode the invention uses a plurality of echoes from each ultrasonic burst to create a reference table of the echo-burst-signature of the empty monitored environment. The invention then processes the reference table so that it only uses the most reliable data. In the detection mode the invention compares the echo-burst-signature of the present environment with the reference table, detecting an object if there is a consistent difference between the echo-burst-signature of the empty monitored environment recorded in the reference table and the echo-burst-signature of the present environment.
REFERENCES:
patent: 4488154 (1984-12-01), Ward
patent: 4512000 (1985-04-01), Masuko
patent: 4622555 (1986-11-01), Doggett et al.
patent: 4636793 (1987-01-01), D'Addio et al.
Clouse, Jr. Clifton E.
Hightower Judson R.
Lee Michael B.
Pihulic Daniel T.
Tarcza Thomas H.
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