教室環境超音波定位系統之設計與實現

Design and realization of ultrasonic locating systemin the classroom environment

饒哲維(Je-Wei Rau)

指導教授 ： 陳永盛

元智大學/工程學院/電機工程學系/碩士(2004年)

摘要

在這個研究中將提出在教室的環境中，結合主動的超音波訊號及訊號抵達時間差定位方法來追蹤授課教師座標的主動定位系統。授課教師配戴超音波發射器，藉此產生的超音波訊號經由教室牆面的正方形超音波偵測器陣列接收。在三維空間的教室的環境中需要四組正方形超音波偵測器陣列來追蹤一個超音波發射源。這個系統使用訊號抵達時間差及訊號角度兩個方法，快速的追蹤音源，避開計算多組雙曲線聯立方程式的難題。未來我們能藉由此主動定位系統提供即時正確的資訊驅動攝影機，追蹤授課中的教授。

關鍵字

三維空間定位 ； 訊號抵達時間差定位 ； 超音波

並列摘要

An active system based on the active ultrasonic signal and time difference of arrival (TDOA) method is proposed to track the teacher in the classroom environment. The teacher pick up a ultrasonic emitter, whereby the ultrasonic signal is recived by square ultrasonic detectors array on the classroom wall. Tracking the ultrasonic emitter source in a three-dimensional classroom environment needs four modules of square ultrasonic detector array. This system adopts a fast calculations schema to locate the sound source. Without solving difficult calculations of simultaneous for linear equations of hyperbola; the new schema combines TDOA method and angle of arrival method to archive the desired goal. In the future we expect to offer immediately and correct location information to drive the equipment of camera, follow the tracking of the teacher.

並列關鍵字

3D LOCALIZATION ； time difference of arrival ； TDOA ； Ultrasound

參考文獻

[1] G. C. Carter, Ed., “Special issue on delay estimation,” IEEE Trans. Acoust., Speech, Signal Processing, vol. ASSP-29, June 1981.

[2] Brandstein, M., and Silverman, H. "A practical methodology for speech source localization with microphone arrays." Computer, Speech, and Language, 11(2):91–126. 1997

[3] M.S. Brandstein. “A framework for speech source localization using sensor arrays.” Ph.D. Thesis, Brown University, May 1995.

[4] J. Flanagan, J. Johnston, R. Zahn, and G. Elko. “Computer-steered microphone arrays for sound transduction in large rooms.” Journal of the Acoustical Society of America, page 1508-1518, November 1985.

[5] G. C. Carter, Ed., “Special issue on time delay estimation,” IEEE Trans. Acoust., Speech, Signal Processing, vol. ASSP-29, June 1981.