摘要
利用真实的电离层 GNSS掩星轨道数据 ,采用全球 3 D射线追踪程序 ,从笛卡尔坐标系下的三维Haselgrove方程和 Budden方程出发 ,利用“打靶”的方法来确定从指定的 GNSS位置到指定的低轨卫星位置正确的射线路径 ,进而模拟出电离层对 GNSS信号的时间延迟。然后 ,通过反演得到了电子密度剖面。分别模拟了太阳活动对 GNSS掩星信号电离层时延的影响 ,以及 GNSS掩星信号电离层时延的年变化和日变化情况 ,结果发现太阳活动对电离层 GNSS信号时延有较大影响 。
In this paper, the ionospheric GNSS signal delay is simulated with real GNSS occultation orbit data, by using 3D tracing program which is based on the three dimensional (isotropic) Haselgrove equations in Cartesian coordinates and Budden equations, to find the correct ray paths going from the specified GNSS positions to the specified LEO positions. Then the GNSS occultation phase delay is calcultated, and the electron density is obtained by reversion technique. The effects are simulated of solar activity on GNSS occultation signal delay and the variations of GNSS signal phase delay within a day and within a year. The results show that the solar activity has a great effect on ionospheric signal delay, and that the variations of GNSS occultation signal within a day and within a year are also large.
出处
《解放军理工大学学报（自然科学版）》
EI
2002年第1期71-74,共4页
Journal of PLA University of Science and Technology(Natural Science Edition)
