在無線感測網路（Wireless Sensor Networks, WSNs）中，一般是由資料收集中心（Sink）及許多的感測器節點（Sensor Nodes）所組成的網路，此網路具有大範圍的環境監視以及無線通訊的特性，其中使用的感測器節點體積小且具備移動、感測事物、資料處理及無線通訊的能力。感測器的佈建及使用上是極其容易，而這些優點相對也帶來了一些限制，感測網路的整體效能以及網路的生命週期都會受到感測器節點的佈建和電量上的限制而有所影響。在無線感測網路的應用中，對於目標物移動追蹤議題中，要如何節省感測器的電量消耗是一個重要的問題，透過醒睡機制可以減少感測器的電量消耗，但若過多節點進入休眠狀態，目標物很容易會移動到休眠狀態的節點，造成目標物遺失，此時重新尋找目標物會造成大成本的電量消耗，所以在省電之餘亦要顧慮到目標物追蹤的準度，是一項極為重要的課題。 本篇論文提出一個應用於混合式無線感測網路中區域防線覆蓋之目標物移動追蹤機制（Target Tracking Mechanism using local barrier coverage in Hybrid Wireless Sensor Networks），利用混合式感測網路的架構，採用靜態節點以及移動節點的感測器，透過移動節點去填補網路環境的空洞（Coverage Hole）藉此來建構區域防線覆蓋來提高追蹤的可能性，減少追蹤的遺失率，同時感測器節點透過預測及休眠機制選擇合適位置的節點去做偵測及修補工作，來降低追蹤目標物感測器所消耗的電量，以達到持續追蹤目標物。 Wireless Sensor Networks (WSNs) is composed of sinks and sensor nodes, which can monitor large-scale environment and do wireless communication. The sensor nodes have several advantages, such as low cost, small size, and capability of mobility, and they can do data sensing, date processing and wireless communication. However, the greatest challenge is the constraints of energy. The most critical issue is how to minimize the energy consumption and keep tracking the mobile target in WSNs. In this paper, we propose a tracking approach for tracking mobile target in hybrid wireless sensor network which consisting of static and mobile node. While static nodes are random distributed in the Field of Interested (FoI) and mobile nodes are moved to fill the coverage hole. We predict the area where the target may cross and construction the local barrier coverage to detect the target. In order to reduce the energy consumption, we wake up the portion of constructed local barrier coverage to tracking the target. The simulation shows the proposed scheme can reduce the energy consumption and missing rate.
