无线传感器网络中基于RSSI的改进定位算法

An Improved Localization Algorithm Based on RSSI in WSN

无线传感器网络节点自身定位至关重要,在军事和民用领域中有着广泛的应用前景.目前的定位算法主要分为两种类型,即基于距离的定位算法和距离无关的定位算法.这两种类型的算法各有优势和不足.考虑了两种算法的优缺点,提出了一种廉价实用的定位算法,该方法通过校正RSSI测距技术测量的节点间点到点的距离,并优选信标节点,最后用加权质心方法进行定位.仿真结果表明:本算法比传统的RSSI定位算法拥有更好的定位性能。

In wireless sensor networks, the node self-localization is vital and promising to a wide scope of both military and civilian applications . In this respect there are two types of algorithms, i. e. range-based and range-irrelevant,either has its own advantages and disadvantages. Taking account of those of the two algorithms,a low-cost and practical algorithm is proposed , using collation of RSSI（received signal strength indicator）for range measurement between nodes and optimization of beacon node in sensor network, then localizing nodes by weight centroid algorithm. Simulation results show that this algorithm has a better performance than classical RSSI algorithm.