Evaluation of GPS Ionospheric Time-Delay Model
Evaluation of GPS Ionospheric Time-Delay Model
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DOI：
10.1109/taes.1987.310830
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发表时间：
1987-05
影响因子：
4.4
通讯作者：
W. Feess;S. G. Stephens
中科院分区：
文献类型：
--
作者：
W. Feess;S. G. Stephens
对于单频全球定位系统（GPS）用户，未经补偿的电离层GPS信号时延是测距误差的最大来源，其贡献可达100 m。为了提高单频GPS用户的测距性能，将电离层测距误差的数值模型引入GPS系统。本文介绍了该模型的评估，其中GPS双频接收机测量的实际大气层时间延迟值与在相同时间点计算的模型值进行了比较。比较了在广泛的conditionwith依赖模型的精度上的几个modelparameters。看来，该模型导致均方根范围测量误差的总体减少了60%。
For single-frequency global positioning system (GPS) users,uncompensated ionospheric GPS-signal time delay is the largestsource of range-measurement error, contributing as much as 100 m.To improve performance for these users, a numeric model of theionospheric range error was incorporated into the GPS system. Thispaper presents an assessment of that model in which actualionospheric time-delay values as measured by GPS dual-frequencyreceivers were compared with model values computed at the sametime points. Comparison was made over a broad range of conditionswith dependency of model accuracy on several of the modelparameters. It appears that the model leads to an overall reductionin rms range measurement error of 60 percent.