摘要
针对采用接收信号强度指示(RSSI)值进行无线传感器网络(WSNs)节点定位中,存在的因节点放置高度不同而产生的测距精度存在差异的问题,在大量实验数据的基础上,分析了RSSI值与距离d在节点布设高度不同时的关系,同时采用分段拟合法对测量曲线进行处理,并在此基础上提出了以恒定步长进行节点趋势移动的校验法,计算RSSI值所对应的距离d。验证结果表明:应用此校验法,节点测距的相对误差有了明显的改善。最后,将改进的测距算法应用到WSNs定位中,仿真结果表明:提出的分段拟合与移动校验法能有效改善定位的精度。
Aining at problem of ranging precision difference caused by different layout height of nodes in WSNs node positioning by RSSI value, on the basis of a lot of experimental data, analyze relationship between RSSI value and distance d while wireless sensor networks （WSNs） nodes are setup at different height, at the same time, process the measured curves by means of piecewise fitting method and propose a calibration method that utilizes node moving according to constant step length on this foundation to calculate distance d corresponding to RSSI value. Verification result shows that the relative error of node ranging,by means of this calibration method, has been improved greatly. At last, the improved ranging algorithm is applied to WSNs positioning, and simulation results show that the proposed section fitting with mobile calibration method can effectively improve positioning precision.
出处
《传感器与微系统》
CSCD
北大核心
2014年第6期133-136,142,共5页
Transducer and Microsystem Technologies
基金
国家自然科学基金资助项目(60973162)
山东省自然科学基金资助项目(ZR2009GM037)
山东省科技攻关项目(2010GGX10132)
山东省威海市科技发展计划资助项目(2008011)
山东省威海市高新技术开发区科技发展计划资助项目(201025)
