GPS电离层折射误差的三阶三频改正模型及精度分析

Third-order Three-frequency Correction Model and Precision Analysis of GPS Ionospheric Refraction Error

为了有效提高GPS电离层信号误差处理精度,本文在GPS电离层折射误差二阶三频改正模型的基础上,构建了GPS电离层折射误差的三阶三频改正模型,并采用GPS三频观测数据,对模型精度进行验证。试验结果表明:在GPS电离层折射误差的二阶三频改正模型中,三阶项折射误差改正精度为58.3%;在GPS电离层折射误差的三阶三频改正模型中,三阶项折射误差改正精度为98.8%,GPS电离层折射误差的三阶项折射误差改正精度提高了40.5%。在路径延迟改正(相延迟、群延迟)中,将三阶三频改正模型的路径延迟与二阶三频改正模型的路径延迟求差可知,相延迟改正增大了约3.01×10-7m,群延迟改正减小了约3.45×10-7m,电离层路径延迟得到了控制,验证了该模型的可行性。

In order to improve the accuracy of GPS ionospheric signal error processing,a third-order tri-band correction model of GPS ionospheric refraction error is constructed based on the second-order three-frequency correction model of GPS ionospheric refraction error,and verify the accuracy of the model The experimental results show that the accuracy of the third-order refraction error is 58.3% in the second-order three-frequency correction model of GPS ionospheric refraction error.In the third-order tri-band correction model of GPS ionospheric refraction error,The correction accuracy is 98.8%,and the correction accuracy of the third order refraction error of GPS ionospheric refraction error is improved by 40.5%.In the path delay correction (phase delay,group delay),the path delay of the third-order three-frequency correction model is different from that of the second-order three-frequency correction model The phase delay correction is increased by about 3.01× 10^-7m,group delay correction is reduced by about 3.45× 10^-7m,and the ionospheric path delay is controlled to verify the feasibility of the model.