【摘要】 利用16个GPS观测站2000年7月1日到8日和7月14日到18日两段不同空间环境下的连续数据讨论了中国区域内磁暴对广域增强系统WAAS电离层折射校正算法的影响。着重分析了平静期和磁暴期间网格改正算法的精度,并从WAAS系统的完整性和可用性出发,对比描述了误差分布的空间特性。其结果表明,位于中高纬的用户精度较高,而低纬用户精度相对降低;磁暴期间,精度下降,对低纬区域用户的影响更为显著;误差空间分布的相关性随距离增大而降低,磁暴期间,相关性进一步变低。更多还原

【Abstract】 In this paper, the algorithm of wide area augmentation system (WAAS) ionospheric grid correction was tested using 16 GPS stations′ observational data under the two different space weather conditions. The span of data was from 1 to 8 and 14 to 18, July, 2000, respectively. The emphasis is put on the accuracy analysis of grid algorithm for the cases of calmness and storm, and the discussion of spatial characteristics of ionospheric grid errors distribution during the storms. The results show that precision is higher for user stations in the middle-high latitudes than in the low latitudes. The algorithm prediction error under disturbed conditions is larger than under good conditions, which is more prominent for the stations in the low latitudes. The decorrelation of stormy residual error increases compared to the ionospheric quiet behaviors.更多还原