Moving object detection system

Details Moving object detection system Moving object detection system

1978-04-28

1980-02-05

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Presence or movement only detection

G01S 966

Patent

active

041874870

ABSTRACT:
This invention relates to a detection system for detecting presence of moving objects such as vehicles, etc. through utilization of ultrasonic energy which includes a predetermined location provided in memory unit and having stored therein time from transmission of ultrasonic energy till reception of reflected energy corresponding thereto from a road surface, circuitry for computing difference a between immediately preceding time from transmission of ultrasonic energy till reception of reflected energy corresponding thereto stored in the predetermined memory location and current time from transmission of ultrasonic energy and reception of reflected energy corresponding thereto, circuitry for storing in the predetermined memory location the current time from transmission of ultrasonic energy till reception of reflected energy corresponding thereto when the difference a is less than a predetermined time .alpha., and circuitry for outputting vehicle detection signal when the difference a is larger than a preset time .beta. which is larger than the time .alpha..

REFERENCES:
patent: 3102252 (1963-08-01), Bolton
patent: 3255434 (1966-06-01), Schwarz
patent: 3539978 (1970-11-01), Steptnitz

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