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针对无线传感器网络中近似三角形内点测试法(Approximate Point-In-Triangulation Test,APIT)对锚节点密度要求高,并且会出现Out-To-In或者In-To-Out误判和节点失效等问题,提出了一种基于无线传感器网络的改进APIT定位算法。该方法利用一种基于方向搜索的移动节点,结合经过高斯拟合处理的接收信号强度指示值(Received Signal Strength Indicator,RSSI)定位算法来解决误判问题,并采用一种几何方法对失效节点进行处理。通过MATLAB对改进的APIT算法进行仿真,实验结果表明,改进后的定位算法在定位精度和误判次数方面均比传统APIT定位算法和基于移动锚节点的改进APIT算法有了很大的提高。
In the WSN, APIT (Point-to-Point Triangle Test) requires high density of anchor nodes and may cause problems such as Out-To-In or In-To-Out misjudgment and node failure , An improved APIT algorithm based on wireless sensor network is proposed. In this method, a mobile node based on direction search is used to solve the misjudgment problem with the Received Signal Strength Indicator (RSSI) positioning algorithm which is Gaussian fitting, and a geometrical method is used for the failure node deal with. The improved APIT algorithm is simulated by MATLAB, and the experimental results show that the improved positioning algorithm has a great improvement over the traditional APIT algorithm and the improved APIT algorithm based on the mobile anchor node both in positioning accuracy and number of misjudgments.