A FM type of non-scanning wide-range ultrasonic sensor for ALV

Author

Emura, Takashi ; Kumagai, Masaaki

Author_Institution

Dept. of Mechatronic Eng., Tohoku Univ., Sendai, Japan

fYear

2001

fDate

2001

Firstpage

716

Lastpage

721

Abstract

This paper describes an improvement of ultrasonic environment-sensors for autonomous land vehicle (ALV). Scanning ultrasonic sensor has very simple structure, but the sensing time is long and the longitudinal detectable range is very short. Therefore, we shortened the sensing time by using a multi-receiver method instead of the scanning method and expanded the detectable range by increasing the power of emitted sound waves. Since the sound pressure was increased extremely, a large audible click noise was generated at the transient time of burst-wave. We decreased this audible noise by modifying the waveform of the burst wave. In order to simplify the discriminating circuit of Doppler shift, a method to modulate the frequency of emitted sound wave is proposed. Basic experiments were carried out and useful results were obtained

Keywords

Doppler shift; frequency modulation; road vehicles; sonar detection; ultrasonic transducers; Doppler shift; autonomous land vehicle; environment sensor; frequency modulation; multiple receiver method; scanning ultrasonic sensor; sensing time; sonar; sound wave; Acoustic beams; Acoustic noise; Acoustic sensors; Band pass filters; Bandwidth; Doppler shift; Frequency modulation; Object detection; Sensor phenomena and characterization; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Intelligent Transportation Systems, 2001. Proceedings. 2001 IEEE

Conference_Location

Oakland, CA

Print_ISBN

0-7803-7194-1

Type

conf

DOI

10.1109/ITSC.2001.948748

Filename

948748