In order to scientifically guide the installation and commissioning of the road side unit(RSU)in ETC lane,this paper proposes a location algorithm of field intensity distribution center of ETC lane based on improved centroid algorithm.By calcu-lating the position of the wireless signal field intensity distribution center of the RSU in ETC lane and comparing it with the center of the trading area of ETC lane,the adjustment suggestions of RSU can be quantified,the distribution of high-intensity signals in the trading area is maximized,and the efficiency of ETC is improved.The calculation results and error analysis of field intensity centroid algorithm,energy centroid algorithm,distance weighted centroid algorithm and specified range centroid algorithm are compared.It is found that the error of distance weighted centroid algorithm is the least,the error is 4.078％,so distance weighted centroid algorithm is more suitable for ETC lane field intensity distribution center location calculation scenar-io.The research results have been applied in Shanxi Province,and the distribution range of the transverse field intensity center and the longitudinal field intensity center of the expressway ETC lane in Shanxi Province are-0.4 m to 0.3 m and 3.93 m to 6.65 m,respectively,by mathematical statistics,which can be used to guide the installation and commissioning of RSU anten-nas.At the same time,it is found that the center of horizontal field intensity of ETC lane is left in this area,and the corre-sponding adjustment suggestions are given.
关键词
质心法/ETC车道/场强分布中心/纵向场强中心/横向场强中心
Key words
centroid algorithm/ETC lane/field intensity distribution center/longitudinal field intensity center/transverse field intensity center
维普
万方数据