基于TEC数据的含电离层闪烁卫星导航信号模拟  

Simulation of Satellite Navigation Signal with Ionospheric Scintillation Based on TEC Data

作　　者：卢丹[1] 李宇鹏 钟伦珑[1] 胡铁乔[1] LU Dan;LI Yupeng;ZHONG Lunlong;HU Tieqiao(Tianjin Key Laboratory for Advanced Signal Processing,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学智能信号与图像处理天津市重点实验室,天津300300

出　　处：《测控技术》2023年第8期71-75,82,共6页Measurement & Control Technology

基　　金：国家重点研发计划(2020YFB0505603)。

摘　　要：电离层闪烁导致卫星导航信号在传播过程中幅度与相位发生随机波动,严重影响接收机的性能。为模拟真实的受电离层闪烁影响的卫星导航信号,以供接收机进行性能测试,提出了基于电离层总电子含量(Total Electron Content,TEC)数据的电离层闪烁仿真方法。该方法通过输入卫星观测文件与导航电文获得电离层的TEC和仰角,利用TEC数据和各卫星仰角,估计出受电离层闪烁影响的各卫星导航信号幅度闪烁指数和相位闪烁指数,结合Cornell模型实现卫星导航信号模拟。该方法充分考虑了卫星导航信号闪烁指数获取困难,以及电离层闪烁对不同卫星导航信号的影响,能够高保真反演卫星导航信号。试验结果表明,该方法反演的电离层闪烁与实际发生的闪烁具有良好的一致性。Ionospheric scintillation causes random amplitude and phase fluctuations of satellite navigation signals in the process of propagation,which seriously affects the performance of the receiver.In order to simulate the real satellite navigation signals affected by ionospheric scintillation for receiver performance test,a simulation method of ionospheric scintillation based on total electron content(TEC)data is proposed.By inputting satellite observation files and navigation messages,the TEC and elevation of the ionosphere are obtained.Through TEC data and the elevation of each satellite,the amplitude scintillation index and phase scintillation index of each satellite navigation signal affected by ionospheric scintillation are estimated.Combined with Cornell model,the satellite navigation signal simulation is realized.The method fully considers the difficulty of obtaining the scintillation index of satellite navigation signals,and the influence of ionospheric scintillation on different satellite navigation signals,which can retrieve satellite navigation signals with high fidelity.The results show that the ionospheric scintillation retrieved by this method is in good agreement with the actual scintillation.

关 键 词：卫星导航系统 电离层闪烁 总电子含量 Cornell模型 闪烁指数 

分 类 号：V241.6[航空宇航科学与技术—飞行器设计]