低纬度电离层闪烁对卫星信号及定位精度影响分析

Analysis of the influence of low-latitude ionospheric scintillation on satellite signal and positioning accuracy

分析电离层闪烁对卫星信号及定位精度造成的影响可为提高卫星导航定位性能提供参考。该研究利用电离层闪烁数据、GPS卫星导航及观测数据,分析闪烁事件高发日和平静日卫星信号质量、可用卫星数和周跳频率的变化,并评估电离层闪烁对定位精度的影响。结果表明:电离层闪烁使卫星信号的振幅和相位无序波动;造成卫星信噪比快速抖动影响卫星信号质量;使得可用卫星数减少造成信号衰减甚至中断;强闪烁期间随着闪烁强度增大周跳增多且定位精度也随之降低,最高可降低20%以上。

Analyzing the impact of ionospheric scintillation on satellite signals and positioning accuracy can provide a reference for improving the performance of satellite navigation and positioning. The study uses ionospheric scintillation data, GPS satellite navigation and observation data to analyze changes in satellite signal quality, the number of available satellites and cycle slip frequency on days with high and quiet scintillation events, and evaluate the impact of ionospheric scintillation on positioning accuracy. The results show that: ionospheric scintillation causes the amplitude and phase of the satellite signal to fluctuate disorderly;causes the satellite signal-to-noise ratio to jitter quickly and affects the quality of the satellite signal;reduces the number of available satellites and causes signal attenuation or even interruption;during the strong scintillation period, the scintillation intensity increases The number of jumps increases and the positioning accuracy also decreases, which can be reduced by more than 20%.