EGNOS对流层延迟改正模型及其精度分析

Delay Model and Accuracy Analysis of EGNOS Tropospheric

对流层延迟是GPS定位中一个主要的误差源,目前处理对流层延迟的主要方法是通过模型法、差分法等;当基线的距离较短时,基线两端气象条件基本相同差分法可以很好地修正对流层延迟误差,当基线的距离很长时,由于基线两端的气象参数差别较大差分法不能很好地消除对流层误差,模型法却能很好地消除对流层误差。对EGNOS模型进行了详细的介绍,并通过MATLAB编写程序;利用IGS跟踪站的数据进行计算分析比较,结果表明EGNOS对流层改正模型在高程上介于Saastamoinen模型和Hopfield模型之间,在x,y方向上精度相当。

Tropospheric delay in GPS positioning is a major source of error,in the handling of the main methods of tropospheric delay correction through model,difference method,etc,weakening or elimination of tropospheric delay error.When the distance is short baseline,baseline ends meteorological conditions are basically the same,difference method can be very good correction troposphere delay error,when the baseline,due to the long distance between the meteorological data at baseline large,difference method can't eliminate the troposphere error well,but model can be a very good method to eliminate the troposphere error.In this paper,EGNOS model was introduced in detail,and through MATLAB programming.IGS tracking station data used to calculate statistical analysis,results showed that the EGNOS tropospheric correction model in elevation on the Saastamoinen model and the Hopfield model range,between the x,y direction precision.