- 學位論文
基於白光二極體的三維室內定位系統
White-LED Based 3D Position Tracking System for Indoor Applications
摘要
基於超分辨率技術(Super resolution)的白光二極體(W-LED)三維室內定位系統中，在房間內，佈置三個白光二極體於天花板，和一個基於均勻線性陣列(ULA)的光檢測器(PD)，其中白光二極體採用了基於分時多工(TDM)的信號，但這方法有兩個缺點。 第一，基於分時多工的信號，白光二極體間必須要有完美的同步時序，否則會造成室內燈光閃爍。 第二，當三個白光二極體發光時，若有兩個白光二極體的垂直角(elevation angle)相同，我們無法分辨白光二極體光源的左右入射方向，這會造成很大的定位誤差。 為了解決上述問題，我們提出了一個新的演算法，整合均勻線性陣列和均勻圓形陣列(UCA)的架構，不但可以讓三個白光二極體同時發光，並利用多項式求根-多重訊號分類(Root-Music)演算法，來增加白光二極體入射角度的準確度。 根據模擬結果，整合用7個光電二極管的均勻線性陣列與9個光電二極管的均勻圓形陣列配置，在訊雜比(SNR)為30分貝(dB)時，系統的最大定位誤差為7公分，與先前文獻相比，準確度提升30%。
並列摘要
In the paper, “White-LED 3D Indoor Positioning Using Super-resolution Technique”, three white light-emitting diodes (W-LED) are deployed as ceiling light, and one mobile uniform linear array (ULA) based photo-detector (PD) is used to estimate the 3D indoor position. However, the time-division-multiplexing (TDM) based signaling used for W-LED data transmission incurs two issues. First, with TDM-based signaling, W-LED’s turn-on sequences must have perfect synchronization. Otherwise, it will blink in the room. Second, when two W-LEDs have the same elevation angle but different azimuth angle. W-LED’s radiation direction cannot be differentiated which may cause huge location error. In order to solve the above issues, we proposed a hybrid algorithm which integrated of uniform linear array (ULA) and uniform circular array (UCA) where all three W-LEDs are always turned on. Root-squared, Multiple Signal Classification(Root-Music) algorithm is used to improve irradiant angle’s estimation accuracy. By deploying 7 ULA based PDs and 9 UCA based PDs, simulation result showed 7 cm location inaccuracy at 30 dB SNR.