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This article elaborated the ultrasonic ranging basic principle, thesurvey, the computational method, and detailed introduction based onultrasonic ranging technology application back-draft radar systemdesign. This system the microprocessor technology and the ultrasonicwave range finder technology, the sensor technology and so on unifies,may examine the automobile in the back-draft process, after thevehicle the obstacle and the automobile distance, through the liquidcrystal display monitor demonstration obstacle distance, the position,and is away from the police according to the obstacle and thetailstock which far and near real-time sends out the different rank toshow the sound.

This paper discusses the basic principles of ultrasonic distance measurement, measurement, calculation method, and based on the detailed application of ultrasonic distance measurement reversing radar system design. The system will be the microprocessor technology and ultrasonic distance measurement techn