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Analysis on Correction Accuracy of Ionospheric Model for BeiDou System

机译：北斗系统电离层模型的校正精度分析

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The ionospheric error is the main error sources affecting positioning accuracy for single-frequency users. Parameters of ionospheric model are broadcast by satellite navigation systems for users, so the correction accuracy of the model has direct impact on positioning results. Based on continuous monitoring stations, Beidou system calculated and broadcast 8 parameters of Klobuchar under the geographic coordinate system, and they are updated every 2 h. In 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 observations. Secondly, 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 model. The effect of residual ionospheric corrections was analyzed for positioning results. The results show that the northern hemisphere is better than the southern hemisphere for the accuracy of Beidou ionospheric model. Mid-latitudes regions can get the best correction, and the RMS of correction residuals was average about 0.6 m, and it showed a decreasing trend to the low-latitude and high-latitude regions. Beidou K8 model is better than GPS K8 model for single frequency positioning in Beijing.
机译：电离层误差是影响单频用户定位精度的主要误差源。电离层模型的参数由卫星导航系统向用户广播，因此模型的校正精度直接影响定位结果。在连续监测站的基础上，北斗系统在地理坐标系下计算并广播了克洛布查尔的8个参数，并且每2小时更新一次。为了科学地评价北斗电离层模型的校正效果，首先，基于北斗最新观测，通过CODE提供的GIM模型，分析了不同时期，不同纬度的电离层模型的精度。其次，分别计算出以下定位模式。 （1）不对北斗进行电离层校正的单频定位。 （2）北斗单频+北斗K8型号。 （3）北斗单频+ GPS K8模型。分析了电离层残留校正的影响，以求得定位结果。结果表明，北斗电离层模型的精度优于北半球。中纬度地区校正效果最好，校正残差均方根平均约为0.6 m，低纬度地区和高纬度地区呈下降趋势。北京单频定位方面，北斗K8模型优于GPS K8模型。

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