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研究生： 陳奕霖
Chen, Yi Lin
論文名稱： 以條件隨機域於相遇時合作定位
Collaborative Localization using Conditional Random Fields upon Encounter
指導教授： 周百祥
Chou, Pai H,
口試委員: 蔡明哲
Tsai, Ming Jer
韓永楷
Hon, Wing Kai
學位類別： 碩士
Master
系所名稱： 電機資訊學院 - 資訊工程學系
Computer Science
論文出版年： 2015
畢業學年度： 103
語文別： 英文
論文頁數： 75
中文關鍵詞： 室內定位 、條件隨機域 、相遇 、合作 、藍芽4.0 、軌跡合併
外文關鍵詞： Indoor, Beacon, CRF, Conditional Random Fields, Encounter, Collaborative, Trajectory merge
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    • 我們提出一項綜合了行人推測航行法與相遇資訊的室內定位技術。裝置相遇可以透過近距離電磁波原理的通訊介面做為鄰近感測的機制。我們以條件隨機域(CRFs)為基礎，加上相遇時交換的軌跡與鄰近資訊， 相較於之前常用的顆粒過濾法，降低了演算的複雜度。實驗數據顯示我們不但減少運算能力的需求，更擴充了室內可定位的範圍。

    This thesis proposes a new indoor localization techniques that fuses pedestrian dead reckoning with encounter information. Encounter is detected by proximity sensing using short-range radio frequency(RF) also used for communication. Our work builds on conditional random fields(CRFs) for the lower computational complexity than the traditional particle filtering by incorporating information exchanged from the encounter, including the trajectory and proximity. Experimental results show that
    we further lower the complexity and expand location coverage.

    1 Introduction . . . . . . . . . . . . . . . . . . 1 1.1 Motivation . . . . . . . . . . . . . . . . . 1 1.2 Contributions . . . . . . . . . . . . . . . . 2 2 Related Work . . . . . . . . . . . . . . . . . . 3 2.1 Non-Encounter Systems . . . . . . . . . . . . 3 2.1.1 Inertial Sensing . . . . . . . . . . . . 3 2.1.2 Fingerprinting . . . . . . . . . . . . . 4 2.1.3 RF Interference . . . . . . . . . . . . . 4 2.1.4 RF Ranging . . . . . . . . . . . . . . . 4 2.1.5 Optical . . . . . . . . . . . . . . . . . 5 2.1.6 Acoustic . . . . . . . . . . . . . . . . 5 2.1.7 Ground Vibrations . . . . . . . . . . . . 5 2.2 Encounter-Based Systems . . . . . . . . . . . 5 3 Background Theory . . . . . . . . . . . . . . . . 7 3.1 Basic Probability Theory. . . . . . . . . . . 7 3.1.1 Terminology . . . . . . . . . . . . . . . 7 3.1.2 Probability . . . . . . . . . . . . . . . 8 3.1.3 Conditional Probability . . . . . . . . . 9 3.1.4 Bayes Theorem . . . . . . . . . . . . . . 9 3.2 Probability Distribution. . . . . . . . . . . 10 3.2.1 Random Variables. . . . . . . . . . . . . 10 3.2.2 Expected Value. . . . . . . . . . . . . . 12 3.2.3 Variance and Standard Deviation . . . . . 13 3.2.4 Gaussian Distribution . . . . . . . . . . 13 3.3 Graphical Models. . . . . . . . . . . . . . . 15 3.3.1 Models . . . . . . . . . . . . . . . . . 15 3.3.2 Graphical Models . . . . . . . . . . . . 15 3.3.3 Factors . . . . . . . . . . . . . . . . . 16 3.3.4 Directed Graphical Models . . . . . . . . 17 3.3.5 Undirected Graphical Models . . . . . . . 19 3.4 Conditional Random Fields . . . . . . . . . . 20 3.4.1 Maximum Entropy Model . . . . . . . . . . 20 3.4.2 Conditional Random Fields . . . . . . . . 25 3.4.3 Viterbi Algorithm . . . . . . . . . . . . 26 4 Collaborative Conditional Random Fields . . . . . 29 4.1 System Overview . . . . . . . . . . . . . . . 29 4.2 Observations and Constraints . . . . . . . . 31 4.3 Merging Mechanism . . . . . . . . . . . . . . 31 4.4 Inference . . . . . . . . . . . . . . . . . . 33 5 System Implementation . . . . . . . . . . . . . . 38 5.1 Observations, States, and Constraints . . . . 38 5.2 Feature Functions . . . . . . . . . . . . . . 40 5.3 Encounter Information . . . . . . . . . . . . 41 5.4 Inference . . . . . . . . . . . . . . . . . . 44 6 Evaluation. . . . . . . . . . . . . . . . . . . . 45 6.1 Design of Experiments . . . . . . . . . . . . 45 6.1.1 Experimental Environments . . . . . . . . 45 6.1.2 Metrics . . . . . . . . . . . . . . . . . 45 6.1.3 Competitors . . . . . . . . . . . . . . . 48 6.2 Results . . . . . . . . . . . . . . . . . . . 48 6.2.1 Accuracy. . . . . . . . . . . . . . . . . 48 6.2.2 Convergence Distance. . . . . . . . . . . 53 6.2.3 Time Complexity . . . . . . . . . . . . . 55 6.2.4 Sample Rates . . . . . . . . . . . . . . 57 7 Conclusions and Future Work . . . . . . . . . . . 58 7.1 Conclusions . . . . . . . . . . . . . . . . . 58 7.2 Future Work . . . . . . . . . . . . . . . . . 59

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