摘要： 当建筑物内发生突发事件时,为更好地跟踪疏散对象,减少位置更新频率,提出一种基于疏散对象速度、方向属性和室内地标单元拓扑、语义结构相结合的混合位置更新策略。当疏散对象速度范围和地标单元两者中有一项发生变化,并满足邻接单元关系时将位置更新到服务端,既保证对象在拥堵处或地标单元处更新,又避免由于室内定位不确定性产生的少数错误更新。实验结果表明,与已有的基于固定时间或安全区域的更
新策略相比,该策略能够在保证疏散对象位置精确度的情况下,以较小的通信代价持续跟踪疏散对象的详细位置信息和拥挤状态。
关键词:
疏散对象,
位置更新,
室内空间,
地标单元,
速度范围,
服务端
Abstract: When emergencies occur in the buildings,in order to monitor the evacuation objects and reduce location
updates frequency,a hybrid location update strategy is proposed enriched by the velocity,direction properties of the evacuation objects and the topological,semantic structure of the indoor landmark unit. This strategy guarantees that the object is updated in crowded or landmark unit, and it reduces a few positioning errors due to indoor positioning uncertainty. As demonstrated by the experiments,compared with existing update strategies based on the fixed time or safety area,under the premise of meeting the location accuracy,this strategy keeps track of evacuated objects’ detailed positioning information and crowded conditions with less communication cost.
Key words:
evacuation object,
location update,
indoor space,
landmark unit,
velocity range,
server-side
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