摘要
探讨了利用区域地基GPS双频精码数据建立单层电离层多项式模型中,多项式系数、组合硬件延迟统一平差的数据处理方法。数据分析表明,GPS卫星短弧段的天空视图对电离层多项式建模的影响较大,由此估计的组合硬件延迟解不稳定,电离层模型也存在系统误差,边际效应明显;分段常数的全天电离层延迟多项式建模的数据处理方法可以有效地削弱短时弧段建模的影响,获取一致性、稳定性更好的组合硬件延迟。
Based on the estimation of polynomial coefficients, the inter-frequency bias of GPS satellites and receivers＇ PCB between P-codes of GPS pseudoranges are combined, and the ground-based GPS observations areased to construct regional VTEC model. Data analysis indicates that, while short-term （i. e. 4 hours＇） GPS observations are used, the result of interfrequency bias is not stable, and polynomial VTEC model has systematical error and shows large errors in the edge of the covered region. However, if the piecewise constant modeling is used to estimate several Sets （i. e. 6 groups） of VTEC polynomial coefficients and one group of the combined inter-frequency bias while using 24-hour＇s GPS dual frequencies＇ observations, the result of differential P-code bias is consistent and stable, and the new polynomial VTEC model is more accurate.
出处
《武汉大学学报（信息科学版）》
EI
CSCD
北大核心
2008年第8期805-809,共5页
Geomatics and Information Science of Wuhan University
基金
国家863计划资助项目(2007AA12Z310)
国家自然科学基金资助项目(40674015
40504002)
