天文学进展Issue(3)：383-394,12.DOI:10.3969/j.issn.1000-8349.2014.03.07
GNSS 对流层延迟映射模型分析
Analysis of Tropospheric Propagation Delay Mapping Function Models in GNSS
摘要
Abstract
Three models frequently used within the IGS for tropospheric propagation delay estimation including NMF, GMF/GPT, VMF1, and the newly-developed model GPT2 are presented in this paper. These models are compared in two scenarios: pressure, hydrostatic zenith delay and mapping function coefficients from different models were compared directly;coordinates and tropospheric parameters from the Precise Point Position (PPP) solutions based on different models using 1 year data of 30 global distributed IGS stations were compared. Results show: (1) Compared to the measured true pressure, VMF1 is the most accurate modeling more than 99.6% of pressure and the accuracy of GPT2 is improved by 25% over GPT; (2) Compared to the VMF1 HT model estimates, the RMS of hydrostatic zenith delay is 1 cm for both GPT and GPT2, and GPT2 is better than GPT;(3) Compared to the daily site VMF1 data, the RMS of mapping function coefficients ah and aw of GPT2 are 1 × 10-5 and 5 × 10-5, respectively;(4) Considering the coordinates from IGS08 frame as true values, estimated coordinates using GMF/GPT or VMF1/GPT2 have an improvement of 22%than NMF;(5) The PPP ZTD estimates using GMF/GPT and VMF1/GPT2 model are more accurate than NMF.关键词
对流层延迟/映射函数/精密单点定位/GPSKey words
tropospheric propagation delay/mapping function/precise point position/GPS分类
天文与地球科学引用本文复制引用
王君刚,陈俊平,王解先..GNSS 对流层延迟映射模型分析[J].天文学进展,2014,(3):383-394,12.基金项目
中国科学院百人计划；863计划(2013AA122402,2014AA123102)；国家自然科学基金(40974018,11273046)；上海市科学技术委员会(12DZ2273300,13PJ1409900) （2013AA122402,2014AA123102）
