不同系统的电离层完备性监测研究

Study on ionosphere integrity monitoring of different systems

针对电离层延迟在卫星导航定位过程中造成的影响及其本身的复杂性,同时考虑到完备性监测的重要性,该文利用河北省CORS网的实测数据进行电离层完备性监测。通过计算双差电离层延迟、电离层残差完备性监测(IRIM)指标、电离层残差内插不确定性(IRIU)指标来探讨GPS/BDS组合系统和单系统下电离层完备性监测的情况。结果表明,IRIM、IRIU值均在cm级精度,精度较高,说明测区上空的电离层情况稳定。而且GPS/BDS组合系统的监测效果要好于GPS、BDS单系统的监测效果,说明BDS的加入提高了电离层完备性的监测性能。

In view of the complexity and the influence of the ionospheric delay caused in satellite navigation and positioning process,and taking into account the importance of integrity monitoring,ionosphere integrity monitoring based on the measured data of the CORS network in Hebei Province was conducted in this paper.Through calculating the ionospheric delay,ionosphere residual integrity monitoring index（IRIM）and ionosphere residual interpolation uncertainty（IRIU）to study the ionosphere integrity monitoring situation under the combined systems and single system,the results showed that the values of IRIM and IRIU were at cm-level accuracy,high precision indicated that the ionosphere above the test area was in a stable condition.The monitoring effect of GPS/BDS combined systems was better than that of single GPS,BDS system,which indicated that the addition of BDS to improve the performance of ionosphere integrity monitoring.