Patent ID: 6128576
Filing Date: 2000-10-03
Classification: G01S

Abstract:
An obstruction detection apparatus comprising:a plurality of ultrasonic wave transmitter/receiver means installed on a vehicle for transmitting ultrasonic wave and for receiving the ultrasonic wave reflected by an obstruction;control means including a distance table for calculating a distance between said vehicle and said obstruction based on a time interval from a time at which the ultrasonic wave is transmitted to a time at which the ultrasonic wave reflected by said obstruction is received by said plurality of ultrasonic wave transmitter/receiver means, and for storing data corresponding to the calculated distance into memory fields forming said distance table;display means for displaying a range where no obstruction is detected by said plurality of ultrasonic wave transmitter/receiver means based on the data stored in said distance table; andalarm means for sounding an alarm about said obstruction for a driver of said vehicle based on the data stored in said distance table,wherein said distance table comprising a plurality of memory fields corresponding to a case in which a same ultrasonic wave transmitter/receiver means transmits said ultrasonic wave and receives the ultrasonic wave reflected by said obstruction and a case in which a different ultrasonic wave transmitter/receiver means transmits the ultrasonic wave and receives the ultrasonic wave reflected by said obstruction.