基于时间差的无线传感器网络节点定位方法

在分析RSSI、ToA、TDoA和AoA测距方法优缺点的基础上,给出一种基于时间差的节点定位方法.该方法无需锚节点与锚节点之间,以及锚节点与目标节点之间的时间同步,根据三个锚节点的定位信号到达目标节点的时间差,即可完成对目标节点的定位.以三个锚节点呈等边直角三角形布置为例,对定位误差进行计算并得出了提高目标节点时钟精度和增加锚节点之间的距离可减小定位误差的结论.最后,利用无线传感器网络测试床进行算法有效性验证,结果表明了所提定位算法的有效性.

Research on location discovery method of wireless sensor networks based on difference of arrival time of beacon signals

The range measurement and location discovery principle of several methods,such as RSSI,ToA,TDoA and AoA are briefly introduced.Afterwards,a novel location discovery algorithm which is based on the difference of arrival time of beacon signals is proposed.There is no requirement of time synchronization among anchor nodes and target nodes.Also,no additional equipment or circuit is needed.Particularly,the error of location discovery is analyzed when anchor nodes are placed in the form of equidistant right-angled triangle.According to the expression of errors,the accuracy of location discovery can be improved through enlarging the distance between anchor nodes and enhancing clock precision of target nodes.In the end,a test bed of wireless sensor networks is applied to verify the effectiveness of the proposed location discovery algorithm,and the experiment result indicates that it is valuable.