摘要
利用VLBI、GNSS等空间大地测量数据估计对流层延迟时,通常不考虑映射函数的误差,但这种处理策略最终会对估计结果造成不可忽略的影响。首先,根据多年的气象资料,分析了映射函数误差随高度角的变化特性,然后构建了映射函数误差模型,进而提出了一种顾及映射函数误差的对流层延迟两步估计法。试验表明,本文提出的方法可有效削弱斜路径延迟残差,并在一定程度上改善对流层湿延迟的估计精度。
Mapping function errors are usually not taken into consideration, when space geodetic data observed by VLBI, GNSS and some other techniques are utilized to estimate troposphere delay, which could, however, probably bring non-ignorable errors to solutions. After analyzing the variation of mapping function errors with elevation angles based on several-year meteorological data, this paper constructed a model of this error and then proposed a two-step estimation method of troposphere delay with consideration of mapping function errors. The experimental results indicate that the method puted forward by this paper could reduce the slant path delay residuals efficiently and improve the estimation accuracy of wet tropospheric delay to some extent.
作者
范昊鹏
孙中苗
张丽萍
刘晓刚
FAN Haopeng;SUN Zhongmiao;ZHANG Liping;LIU Xiaogang(School of Geospace Information,Information Engineering University,Zhengzhou 450052,China;Institute of Surveying and Mapping,Xi’an 710054,China;State Key Laboratory of Geo-Information Engineering,Xi’an 710054,China)
出处
《测绘学报》
EI
CSCD
北大核心
2019年第3期286-294,共9页
Acta Geodaetica et Cartographica Sinica
基金
国家自然科学基金(41674082
41774018)~~
关键词
对流层延迟
映射函数误差
甚长基线干涉测量
参数加权平差
欧洲中期天气预报中心
troposphere delay
mapping function errors
very long baseline interferometry
parameter weighted adjustment
European Centre for Medium-Range Weather Forecasts