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JRM Vol.16 No.3 pp. 333-341
doi: 10.20965/jrm.2004.p0333
(2004)

Paper:

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A Study on Propagation Characteristics of Spread Spectrum Sound Waves Using a Band-Limited Ultrasonic Transducer

Akio Yamane, Taketoshi Iyota, Yongwoon Choi,
Yuzuru Kubota, and Kazuhiro Watanabe

Faculty of Engineering, Soka University, 1-236 Tangi, Hachioji, Tokyo 192-8577, Japan

Received:
October 20, 2003
Accepted:
December 5, 2003
Published:
June 20, 2004
Creative Commons License
Keywords:
spread spectrum, ultrasonic sound wave, range measurement, global positioning system
Abstract
Propagation characteristics and range experiments of spread spectrum 40kHz ultrasonic waves have been explored under band-limited frequency. Comparative experiments were conducted using two arrangements combining a broadband speaker and a microphone for the broadband case, and an all-purpose receiving transducer and the broadband speaker for the band-limited case. Under the broadband condition, range accuracy measurements and evaluation of signal discrimination in a code division multiple transmission were made demonstrating 0.034% (corresponding to about 7mm in range distance) of range accuracy for a full-scale distance of 21.6m, demonstrating high signal discrimination. The severely band-limited experiment improved accuracy from 0.084% for a distance of 8.4m to 0.063% for a greater distance of 14.4m using a longer M-sequence length by extending shift registers from 10-bit to 15-bit. These experimental results show promise in the intended application of ultrasonic spread spectra to local positioning systems.
Cite this article as:
A. Yamane, T. Iyota, Y. Choi, Y. Kubota, and K. Watanabe, “A Study on Propagation Characteristics of Spread Spectrum Sound Waves Using a Band-Limited Ultrasonic Transducer,” J. Robot. Mechatron., Vol.16 No.3, pp. 333-341, 2004.
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