NeQuick2模型在星载单频GPS实时定轨中的应用

摘要

在星载单频GPS实时定轨中引入NeQuick2三维电离层延迟改正模型,首先利用GIM对Klobuchar 和NeQuick2模型进行精度评估,然后使用不同电离层改正方法模拟仿真星载单频GPS实时定轨实验.结果表明,当卫星轨道低于500 km时,相比于传统的改进Klobuchar改正的定轨精度,利用NeQuick2改正的定轨精度提高0.2m左右,与双频伪距法定轨精度相当.%In this paper,a three-dimensional ionosphere model-NeQuick2 is introduced.We firstly evaluate the precision of Klobuchar and NeQuick2 using global ionosphere maps and then perform the SADODS simulation experiments in different methods,using different ways to eliminate the influence of ionosphere.The results demonstrate that the orbital accuracies using NeQuick2 are improved by 0.2 m compared to the traditional method using modified Klobuchar.