Automatic Vehicle Identification Using Pulsed Ultrasonic Radar

Abstract

In this paper the methods and results of measurements to classify vehicles travelling a roadway, without utilization of a vehicle-mounted device, are described. In this classification method, a shape pattern of the vehicle's height is measured using a pulsed ultrasonic radar sensor. This measured shape pattern is divided into 8 parts of equal length on a time base, and the height value of each of the 8 parts is compared with a table of values stored in advance in a microprocessor. When a pattern match is obtained, the vehicle class is identified. The passing vehicles are separated into four categories: 1) small passenger car, 2) large passenger car, 3) small truck and 4) large truck. This classification is independent of vehicle speed.

High-intensity aerial ultrasonic source with sharp directivity containing a compact circular vibrating plate

“…In recent years, there has been much research on the noncontact use of aerial ultrasound, such as the use of strong ultrasound using ultrasonic sensors. [1][2][3][4][5][6][7][8][9][10][11][12] However, because of the small size of ultrasonic sensors, the sound pressure of sound waves that can be emitted by a single sensor is low. Therefore, in order to emit sound waves with high sound pressure, ultrasonic sensors are arrayed in large numbers (50-300) and used as a focusing sound source.…”

Human Face Classification Using Ultrasonic Sonar Imaging

“…Iwamoto et al 3) investigated the performance of pulsed ultrasonic radar used in vehicle classification. The range information of the car was extracted from ultrasonic echoes.…”