Analysis on correction accuracy of ionospheric model for Beidou system
作者单位：P.O. Box 5128 Beijing 100094 China
会议名称：《第五届中国卫星导航学术年会》
会议日期：2014年
学科分类：08[工学] 080401[工学-精密仪器及机械] 081105[工学-导航、制导与控制] 0804[工学-仪器科学与技术] 0825[工学-航空宇航科学与技术] 0811[工学-控制科学与工程]
关 键 词：Ionospheric model regional navigation system correction residuals correction rate
摘 要：With The ionospheric error is the main error sources affecting positioning accuracy for single‐frequency users *** of ionospheric model are broadcast by satellite navigation systems for users,so the correction accuracy of the model has a direct impact on positioning *** on continuous monitoring stations,Beidou system calculated and broadcast 8 parameters of Klobuchar under the geographic coordinate system,and they are updated every 2 *** order to scientifically evaluate the correction effect of Beidou ionospheric model,firstly,the ionospheric model accuracy of different time periods and different latitudes was analyzed through the basis of GIM model provided by CODE based on Beidou latest ***,the following positioning modes were calculated respectively.（1） Single frequency positioning without ionospheric corrections of Beidou.（2） Beidou Single‐frequency + Beidou K8 model.（3） Beidou Single‐frequency + GPS K8 *** effect of residual ionospheric corrections was analyzed for positioning *** results show that the northern hemisphere is better than the southern hemisphere for the accuracy of Beidou ionospheric ***‐latitudes regions can get the best correction,and the RMS of correction residuals was average about 0.6 meters,and it showed a decreasing trend to the low‐latitude and high‐latitude *** K8 model is better than GPS K8 model for single frequency positioning in Beijing.