Journal of Computer Applications

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Grid division-based probabilistic localization algorithm for WSN

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  • Received:2007-10-22 Revised:2007-11-28 Online:2008-04-01 Published:2008-04-01
  • Contact: Jiang Wen-Tao

无线传感器网络中一种基于栅格划分的概率定位算法

蒋文涛 李连 孙利民   

  1. 海军航空工程学院;中国科学院软件研究所 北京理工大学 中国科学院软件研究所
  • 通讯作者: 蒋文涛

Abstract: The Received Signal Strength Indicator (RSSI)based nodes localization algorithms are extensively applied in wireless sensor networks. Due to the influence of wireless signal attenuation and the channel barrier shielding, the localization accuracy of these algorithms are not high. A grid divisionbased probabilistic localization algorithm was put forward. This new algorithm first divided the area where the unknown nodes may exist into a number of grids. Then, it calculated out the confidence of every grid under the assumption that the unknown node was just in that grid. Finally, it calculated out the coordinates of the unknown node based on several geometric centers of the grids of high confidence. The localization result of this algorithm is less influenced by the noise pollution and is of high position accuracy.

Key words: nodes localization, Received Signal Strength Indicator (RSSI), grid division, localization accuracy

摘要: 基于接收信号强度(RSSI)的节点定位算法是目前应用较为广泛的定位算法。由于无线信号受信道衰减和障碍物屏蔽等因素的影响,基于RSSI的定位算法精度不高。提出了一种基于栅格划分的概率定位算法,首先将待定位节点可能存在的区域划分为若干栅格,再根据无线信号在空间传输的概率模型,计算出待定位节点处于各个栅格的置信度,最后以置信度较高的栅格的形心为基准点,计算出待定位节点的坐标位置。算法降低了噪声污染对定位结果的影响,定位精度较高。

关键词: 节点定位, 接收信号强度指示, 栅格划分, 定位精度