綜整彈性波與無線感測器網路之定位系統研發

Research and Development of Elastic Wave Based Indoor Localization Coupled with Wireless Sensor Network

羅子仁(Tzu-Jen Lo)

指導教授 ： 吳文中

國立臺灣大學/工學院/工程科學及海洋工程學研究所/碩士(2008年)

https://doi.org/10.6342/NTU.2008.10177

摘要

本研究以暫態彈性波量測技術為基礎，配合本研究團隊以IEEE802.1.5.4為基礎開發出的無線感測器網路平台，建立出室內定位系統之雛形，系統架構為利用無線感測器模組外接訊號擷取電路結合暫態彈性波感測器，藉由臨界電壓觸發判別訊號到達時間，將訊號到達時間以無線射頻收發器將資訊傳回電腦，在電腦端上使用訊號到達時間差演算法推估未知點位置。以臨界電壓觸發的判斷機制較為簡易，相對在判別上會有較高不確定性，造成時間差不小的漂移量，這樣的情形可以利用交互相關函數來彌補，因此在本文後段將暫時利用示波器量測訊號，初步驗證交互交關函數的可行性。

關鍵字

無線感測器網路 ； 彈性波 ； 室內定位 ； 交互相關函數

並列摘要

This thesis demonstrates the possibility of using elastics wave source for localization on bare floor with a in-house developed wireless sensor network based on IEEE 802.15.4 standard. Multiple piezoelectric surface vertical displacement sensors are used to sensing the time-of-arrival time and estimated for the source location of the wave source. Simple triggering level for estimation of time-of-arrival are adopted in the experiments, without complex calculation or digital signal processing. However, major timing errors of time-of-arrival were found contributed from this simple estimation method. A more accurate time-of-arrival estimation with cross correlation algorithm can further reducing timing errors are successfully developed but requires more computation resources and consumes more overall power which is not yet implement on the capability limited sensor node processors at this moment. The results illustrate that cross correlation scheme would be a feasible solution to get better estimation of localization with wireless sensor network in the future.

並列關鍵字

wireless sensor network ； elastic wave ； localization ； cross correlation.

參考文獻

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