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Simulation Studies for Ionospheric Scintillation

机译：电离层闪烁的模拟研究

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摘要

Small-scale variations in ionospheric electron density result in amplitude and phase scintillation (rapid variations) of the received GPS signal. It is known that these effects are more severe during times of peak solar activity and in equatorial and polar regions. Possible effects of this phenomenon on the overall performance will appear via degraded measurement accuracy obtained by the user receiver and by the reference receivers in Wide Area Augmentation systems such as FAA WAAS. Further effects are frequent receiver loss of lock and longer acquisition times. When some of the reference receivers lose lock, their measurements will be unavailable during these periods and cause degradation in the performance of the interpolation algorithms. Loss of lock at the user receiver will result in a reduction ofrnthe number of satellites in the navigation solution, which may result in degradation of the Receiver Autonomous Integrity Monitoring (RAIM) system. This paper presents an approach for assessing the potential impact of the ionospheric scintillation on the GPS receiver. One of the most important steps in this direction is to be able to simulate the statistical time series representing signal amplitude and phase under any specified ionospheric condition related to solar activity level, the level of earth's magnetic field activity and the receiver location.
机译：电离层电子密度的小范围变化会导致接收到的GPS信号出现幅度和相位闪烁（快速变化）。众所周知，在太阳活动高峰时以及在赤道和极地地区，这些影响更为严重。在广域增强系统（例如FAA WAAS）中，用户接收器和参考接收器获得的降低的测量精度会降低这种现象对整体性能的可能影响。进一步的影响是接收器频繁丢失锁定和更长的获取时间。当某些参考接收机失去锁定时，在这些时间段内将无法获得其测量值，从而导致插值算法性能下降。用户接收器锁定的丢失将导致导航解决方案中卫星数量的减少，这可能导致接收器自主完整性监控（RAIM）系统的性能下降。本文提出了一种方法来评估电离层闪烁对GPS接收器的潜在影响。该方向上最重要的步骤之一是能够模拟统计时间序列，该统计时间序列表示在任何指定的电离层条件下与太阳活动水平，地球磁场活动水平和接收器位置有关的信号幅度和相位。

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