削弱GPS卫星和接收机硬件延迟对TEC反演精度影响方法的研究

摘要

利用地基GPS观测技术可反演区域甚至全球范围电离层的总电子含量(TEC),但其中GPS卫星和接收机硬件延迟是影响反演TEC精度的最重要的一个系统偏差.为消减此系统偏差,利用双频载波平滑伪距和球谐函数建立电离层延迟改正模型,进行TEC反演并与IGS公布的TEC对比,以验证反演的有效性.此外,分析2013年6月的太阳和地磁活动与反演的TEC,结果表明,太阳和地磁活动指数变化与反演的TEC变化趋势一致.%The total electron content (TEC) of the ionosphere in the region and even the whole world can be inverted by ground-based GPS observation technique,but delay of GPS satellite and receiver is one of the most important system error which affects inversion TEC accuracy.In order to weaken this system error,TEC inversion and result from IGS is compared by Ionospheric delay correction model based on dual frequency carrier smoothed pseudorange and spherical harmonics so as to verify inversion availability.Moreover,analyzing solar and geomagnetic activity and inversion TEC shows that index change of solar and geomagnetic activity is in accordance with TEC changing trend.