附加IRI模型约束的全球电离层建模及定位精度分析

Global Ionospheric Modeling and Positioning Accuracy Analysis with IRI Model Constraints

摘要:

采用载波相位平滑伪距的全球电离层建模方法，确定了添加国际参考电离层（IRI）模型约束和不同数据选取策略的有效性和必要性。实验分析表明，采用P₁、P₂原始双频观测数据并添加IRI模型约束后，部分历元电离层建模的整体效果得到了显著提高，在观测数据不足的区域内定位误差在北、东、高方向上分别减小了0.260 m、0.146 m和0.103 m，验证了该方法的有效性；将C₁观测值作为低精度数据取代缺失P₁观测值后，电离层建模的整体效果进一步提升，但损失了模型精度，在观测数据不足的区域内定位误差在北、东、高方向上分别增加0.524 m、0.111 m和1.549 m，说明了利用P₁、P₂双频观测数据的必要性。

Abstract:

The effectiveness and necessity of adding International Reference Ionosphere （IRI） model constraints and different data selection strategies are determined in the global ionospheric modeling with the carrier-to-code leveling method. The experimental analyses show that by using the original dual-frequency P₁ and P₂ observations with IRI model constraints， the overall effect of ionospheric modeling is significantly improved at some epochs. Specifically， in those areas where observations are insufficient， the positioning errors are significantly reduced by 0.260 m， 0.146 m， and 0.103 m in the North， East， and Up directions respectively， which verifies the effectiveness of the method. After replacing the missing P₁ observations with C₁ observations as low-accuracy data， the overall quality of ionospheric modeling is further improved， although the model accuracy is slightly lost. In areas without sufficient observations， the positioning errors are increased by 0.524 m， 0.111 m， and 1.549 m in the North， East， and Up directions respectively， indicating the necessity of using the P₁ and P₂ dual-frequency observation data.