电离层环境对地空信息系统的影响效应

目的为了减缓电离层对卫星通信、全球卫星导航系统、星载合成孔径雷达等系统的影响,提高系统的环境适应性。方法由穿越电离层的无线电信号传播原理出发,结合各种系统的工作原理,给出电离层影响的分析方法。结果针对电离层闪烁、极化旋转、时延和色散等传播效应造成卫星通信误码率上升、卫星导航定位误差增大、SAR图像偏移和分辨率下降等影响,分析给出了效应补偿和减缓应对方法。结论电离层延迟效应可以由电离层实测值或者模型来进行校正,而闪烁效应大多需采用规避的措施来减缓其影响。

Effects of Ionospheric Environment on Earth-Space Information Systems

Objective To mitigate effects of ionosphere on satellite communication, Global Navigation Satellite System (GNSS) and space-based Synthetic Aperture Radar (SAR) and improve the environmental suitability of the system. Methods Based on propagation principles of radio-wave which travels through the ionosphere, and the mechanism of the various systems, analysis methods of ionospheric effects were given. Results Solutions for compensation and mitigation were give in allusion to that ionospheric scintillation, Faraday Rotation, time delay and dispersion would raise the error rate of satellite communication, increase the positioning error of GNSS, lead to the excursion of SAR image and degradation of resolution. Conclusion The effect of ionospheric delay can be corrected by observation or ionospheric models. However, the effect of scintillation can only be mitigated through some avoiding methods.