著者
山根 章生 武信 誠一 井上 大輔 吉田 誠一 小崎 昌義 藤本 洋介 伊与田 健敏 崔 龍雲 久保田 譲 渡辺 一弘
出版者
一般社団法人日本機械学会
雑誌
ロボティクス・メカトロニクス講演会講演概要集
巻号頁・発行日
vol.2003, pp.65-66, 2003

汎用超音波トランスデューサは, その周波数特性より中心周波数40kHzより±5kHzで約20dBの減衰が生じる。これらの送受信器特性を考慮し, スペクトル拡散音波の信号伝搬特性を実験より求め, 拡散要素である設定について検討を行う。
著者
鈴木 彰真 伊与田 健敏 宇佐美 信也 渡辺 一弘
出版者
The Society of Instrument and Control Engineers
雑誌
計測自動制御学会論文集 (ISSN:04534654)
巻号頁・発行日
vol.46, no.7, pp.357-364, 2010 (Released:2011-11-03)
参考文献数
20
被引用文献数
2 1

This paper describes a real-time processing of indoor positioning system using SS (spread spectrum) ultra sonic waves. For code acquisition, it is required to obtain correlation values between the received ultra sonic signals and replica signals. Moreover a real-time processor for correlation values is indispensable part to build a positioning system for practical use. In our case, the real-time processing means that 16000 data of received signals must be processed in only 6 micro seconds (one sampling cycle time). Under such limited conditions, even if a dedicated hardware is constructed on a FPGA, a real time processing to obtain correlation values is hard to be realized without new algorithm ideas. Therefore, a real-time processing hardware utilizing the new algorithm named Stored Partial Correlation Method was developed in this paper. The paper also conducts experiments of range measurements to compare results by Stored Partial Correlation Method and ordinary off-line processing. As a result, outputs with real-time correlator have almost the same values as those with ordinary off-line processing. Furthermore, the real-time processing of correlation calculation is achieved within 5.76 micro seconds .