トウ　リヨウ   Ryo TOH   陶　良    所属   千葉工業大学  工学部 電気電子工学科    千葉工業大学  工学研究科 工学専攻    千葉工業大学  工学研究科 電気電子工学専攻    職種   教授
言語種別	英語
発行・発表の年月	2017/03
形態種別	学術雑誌
査読	査読あり
標題	Ultrasonic direction measurement using sensitivity-compensated signal and band expansion method based on linear prediction
執筆形態	共著
掲載誌名	Acoustical Science and Technology
掲載区分	国内
出版社・発行元	Acoustical Society of Japan
巻・号・頁	38(2),pp.71-79
著者・共著者	Dai Chimura, Ryo Toh, Seiichi Motooka
概要	High-resolution ultrasonic pulse-echo measurement is discussed. For higher time resolution, a sensitivity-compensated (SC) signal and a method of band expansion using linear prediction (LP) processing have been proposed. Moreover, two-dimensional direction measurement calculated from the difference in distances derived using the SC signal has been studied. Because a small error in distances will result in a large error in the direction result, higher accuracy of distance measurement is required. In this paper, the efficiency of band expansion using LP processing with an autoregressive model is discussed for two-dimensional direction measurement. The comparison results show that by using the band expansion method, the compressed pulse width is shortened to about 18% of its original value and the accuracy of direction measurement is improved using the higher-timeresolution signal.