4种对流层模型在南极地区的适用性分析

Applicability Analysis of Four Tropospheric Models in Antarctic Region

GPS信号传播过程中穿过对流层时受到大气折射的影响,其信号发生弯曲和延迟,因此,对流层延迟是GPS测量的主要误差源之一。对流层延迟模型改正算法的选择关系着GPS探测大气水汽的精度。介绍了Saastamoinen、Hopfield、UNB3及EGNOS等4种国际上常用的对流层延迟模型,以南极戴维斯站(DAV1)为例,计算了4种对流层模型在南极地区的天顶总延迟(ZTD)、天顶干延迟(ZHD)和天顶湿延迟(ZWD),与探空数据进行比较,得到了适合南极地区的对流层延迟模型。

When GPS signal transmit the troposphere,signal bending and delay will occur on account of atmosphere refraction,therefore tropospheric delay is one of the main error sources in GPS measurements.The choose of correction algorithm in tropospheric delay model has an important relationship with accuracy of detection of atmospheric water vapor by GPS.This article describes four kinds of international common tropospheric delay models,such as Saastamoinen,Hopfield,UNB3,EGNOS,etc.and calculates the zenith total delay（ZTD）,zenith hydrostatic delay（ZHD）and zenith wet delay（ZWD）in Antarctic region with four kinds of tropospheric delay models by example of antarctic Davis station（DAV1）.Compared with the sounding data,we obtained the tropospheric delay model suitable for the Antarctic.