关于地理信息探测精确定位仿真研究

Simulation and Research on Accurate Localization Based on Geographical Information Prospecting System

在基于传感器网络设计的地理信息探测系统中,节点的精确定位对于系统整体性能影响甚大。传统的定位研究只考虑了定位精度的提高,而并未进一步考虑算法中定位误差的具体变化范围以及误差对其它系统子模块的影响。针对以上问题,着重研究了在RSSI测距以及加权质心定位场景下,系统中地理路由功能子模块的抗误差算法。算法首先根据RSSI测量信息的模型,获得了转发间距经加权质心定位后的误差的统计性质及范围;然后以转发距离期望的误差均方根最小为主要依据,设计了一种新的地理路由信息转发协议。仿真结果表明,新提出的算法能够有效减少实际应用场景下定位误差对于数据包投递率的影响,并且在能量消耗、重传次数方面也均优于同类算法,对提高系统整体性能具有指导作用。

In the study on geographical information prospecting system based on wireless sensor network, accurate localization has great impact on the systems＇ performance. The traditional research on localization only considers how to improve the accuracy of algorithm, which does not take account the variance rage of localization error and its influence on other sub - module of system. In order to solve the problem, an anti - error method for geographic routing module is proposed in the scenario of RSSI based weighted centroid localization. Firstly, based on the model of RSSI measurement, the algorithm obtained the statistical characteristics and numerical range with respect to error of forwarding distance after weighted centroid localization. And then a new localization error - resilient geographic routing was proposed, which regarded the minimum rms error of distance expectation as main delivery basis combined with node residual energy and deviation angle. Simulation results show that accounting for the error influence of specific localization significantly reduces the failure of packet delivery ratio as well as energy consumption and retransmission numbers, which also has guiding effect on improving the system＇s global performance.