北斗卫星信号实时单站电离层估计算法及性能分析

A Real-time Dual-frequency Ionospheric Estimation Algorithm Performance Analysis Based on BeiDou Observational Data

在研究已有实时电离层估计方法的基础上,提出了顾及硬件延迟偏差的实时单站电离层总电子含量估计方法。利用该方法对位于湖北省内的8个测站GPS和北斗实测数据进行模拟实时的处理,将估计结果与全球电离层格网模型进行对比分析,GPS和北斗的估计结果其量值及变化趋势与全球电离层格网模型插值结果都较为一致,其中GPS的误差保持在4TECU(1TECU=1016 m-2)之内,北斗的误差保持在5TECU之内。实验表明,该方法可以很好地实现实时单站电离层估计,独立利用北斗卫星导航系统信号可以实现电离层活动监测。

Based on the study of the existing real-time ionospheric estimation methods, the calculation formula for TEC using a combination of, pseudo-range and carrier phase observations is proposed in this paper. Hardware delay deviation is also considered. Using simulated real-time observations from eight stations in Hubei province, estimated TEC results for the GPS and BeiDou systems were ob- tained for each station and compared with the GIM model. Numerical results showed that： the estimated TEC results from both systems are consistent with GIM in its magnitude and trend. In addition, the RMS of GPS was maintained within 4 TECU while the BeiDou was 5 TECU. The results show that the method can achieve real-time TEC for the BeiDou satellite navigation system and can monitor the ionospheric activity independently.