摘要: 利用IGS提供的双频GNSS观测数据，分析了Kalman方法解算电离层垂直总电子含量（Vertical Total Electron Content，VTEC）存在的问题，提出了Kriging-Kalman改进解算方法，并对两种方法解算的电离层VTEC进行分析和比较.结果表明：在低纬地区，当观测卫星数量发生改变时，Kalman方法解算的VTEC存在跳变异常，Kriging-Kalman方法解算的VTEC变化较为平稳，不存在跳变现象.对比分析耀斑期间两种方法解算VTEC的变化，发现Kalman方法解算的VTEC变化明显小于耀斑引起VTEC的增量；Kriging-Kalman方法解算结果与实际变化相一致.表明Kriging-Kalman方法计算精度更高，能够更精确计算耀斑等剧烈异常空间天气活动期间的VTEC及其变化，有利于电离层VTEC日常精确监测、研究和工程应用.
摘要: The laser beam used to establish a communication channel between satellite and ground segments has a small divergence angle and a tiny spot on the Earth’s surface, which may lead to the fail of the system. So it’s important to study the deflection of laser beam by the Earth’s atmosphere and find a way to calibrate this error. Both theoretical analysis and real data processing method are used to obtain the mathematical model for divergence angle of laser communication beam and its correction function. Then the model has been applied to the data, which was used to describe the atmosphere state by traditional ground segments to obtain the critical elevation angle. According to the results of calculation, our conclusion will be that the correction should be done when the critical elevation happens.
