Abstract
This paper introduces ultrasonic ranging system which can be applied to avoid obstacle and navigate for mobile robot .This system is composed of AT89S51 single chip microcomputer ,ultrasonic transmitting circuit, ultrasonic receiving circuit, amplifying and filtering circuit , peak value time detecting circuit, environment temperature compensation circuit. The method of echo peak time detection point is used to eliminate the error. It is proved that The maximum range of the system is 10 meter and maximum measurement error can be controlled to± 2 cm or so. This system has such merits as rapid corresponding, high precision, high performance price rate.
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