两种对流层延迟模型对不同海拔地区模拟效果的比较与分析

Comparison and Analysis of the Simulation Effect of Two Tropospheric Delay Models on Different Altitude Regions

对流层延迟是GPS传播过程中的主要误差源之一,误差的量级足以对观测数据的质量产生影响。在一般的工程应用中,大多采取建立对流层延迟模型的方式消除对流层延迟的影响。本文在编程实现Hopfield模型和Saastamoinen模型的基础上,结合IGS提供的BJFS、URUM、LHAZ测站的气象数据、对流层延迟参考值,分析了在不同海拔高度下对流层延迟模型值和参考值之间的差异。结果表明,随着测站海拔高度的增加,天顶方向对流层延迟逐渐减小,模型间差值逐渐增大。对于高海拔地区,Saastamoinen模型对天顶方向延迟的模拟效果更好。当卫星高度角减小时,模型间差值逐渐增大。测站越高,模型间差值越大。所以对高海拔地区的观测数据进行处理时,选择合适的延迟模型显得十分必要。

Based on the realization of Hopfield model and Saastamoinen model, combined with meteorological data and reference value Of troposphere delay of BJFS, URUM, LHAZ provided by IGS, this paper analyzes the difference between the values of delay model and the reference values at different altitudes. Results show that, with the increase of the station altitude, the zenith path delay decreases, the difference of the models increases. In high altitude area, Saastamoinen model has a better simulation effect on the zen ith path delay. When the high angle decreases, the difference of the models increases. The higher the station is, the grea- ter difference of the models is. To deal with the observation data in high altitude area, it is necessary to select appropriate delay model.