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	2017/12
形態種別	学術雑誌
査読	査読あり
標題	Spectrum Compensation for Time-Reversal Method on Ultrasonic Target Detection Using Pulse Compression
執筆形態	共著
掲載誌名	IEEE Trans. UFFC
掲載区分	国外
出版社・発行元	IEEE
巻・号・頁	64(12),pp.1874-1882
著者・共著者	Dai Chimura, Ryo Toh and Seiichi Motooka
概要	This paper discusses a method of time reversal (TR) for target detection using a signal with a higher signal to noise ratio (SNR) and higher resolution. We propose three types of SC-for-TR signals. An SC-amplitude-modulated (AM)-for-TR signal and an SC-frequency-modulated (FM)-for-TR signal are calculated using squared spectrum compensation. Moreover, to enhance the transmitting energy of a time-reversed wave for a higher SNR, we propose an SC-amplitude-and frequency-modulated-for-TR (SCAFM-for-TR) signal. The efficiency of the SC-for-TR signals is investigated on target ranging in water using pulse compression. Accordingly, the SC-for-TR signals derive a pulse compressed signal with a higher resolution. In addition, the precision of target ranging using the SCAFM-for-TR signal is greater than that using the other SC-for-TR signals at an arrangement when a target was fixed at a position where a signal with a lower SNR is received.