Method and device for ultrasonic distance measuring

Details Method and device for ultrasonic distance measuring Method and device for ultrasonic distance measuring

1994-10-13

1996-04-16

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367 97, G01S 1500

Patent

active

055089747

ABSTRACT:
In a device for measuring the distance to an obstacle, a second transmission pulse as a control measurement for an ultrasonic distance measurement is transmitted only when an echo signal has been received for a first transmission pulse. In addition, a timing window, within which the expected echo signal falls when it is reflected by an obstacle, is created. In this manner, interference signals are advantageously suppressed and the measuring time is accelerated, so that for an application in a motor vehicle to measure distance, a current measured value is always known while the vehicle velocity and the path covered are taken into consideration.

REFERENCES:
patent: 4500977 (1985-02-01), Gelhard
patent: 5241515 (1993-08-01), Harms et al.
F. R. Koperda and J. W. Vandenbury, "Ultrasonic Position Indicator", Aug. 1984, IBM Technical Disclosure Bulletin, vol. 17, No. 3, pp. 1670-1672.
Wellhausen, "Ultraschall-Ortungssytem fur Flurforderfahrzeuge" (Ultrasonic Tracking System for Industrial Trucks), Elektronik 9, Apr. 27, 1990, pp. 100, 101, 104 and 105.

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