【作者】 王苗苗； 李博峰； 沈云中； 楼立志；

【Author】 Miaomiao Wang, Bofeng Li, Yunzhong Shen, Lizhi Lou College of Surveying and Geo-Informatics of Tongji University, Shanghai, China

【机构】 同济大学测绘与地理信息学院；

【摘要】 对流层延迟是高精度多频多模GNSS导航应用的主要误差源,为此不同国际机构发布了高精度的全球对流层天顶延迟产品,但由于他们采用的数据源和计算方法不同,导致其应用精度和适用性不同。本文评估各对流层产品在北斗导航应用中的效果,首先分析各产品在中国区域的差异及适用性。利用格网插值方法计算各对流层延迟产品获得陆态网中244个测站的对流层天顶延迟,并与Bernese软件的计算结果比较,分析各产品、不同插值方法的精度。在北斗导航应用中,将插值结果与常用的Saastamonien和UNB3模型比较,分析各产品对导航定位精度的影响。结果表明,不同区域的对流层插值精度不同,主要受站点高程离散度的影响;各产品在不同区域的精度不同,其中VMFG产品精度总体较高,但是各产品都能较传统模型有效提高导航定位精度。更多还原

【Abstract】 Troposphere is one of key factors limiting the multi-frequency, multi-GNSS navigation applications. Currently, several international agencies have been providing the post-processed and high-accuracy global troposphere delay products. The accuracy and applicability of these products differ with each other since the methods and data source used in their generation are different. In this paper, we dedicate to assess these troposphere delay products in BeiDou navigation and positioning applications. We firstly analyzed accuracy of the troposphere delay products with 244 stations from Crustal Movement Observation Network in China. For the evaluation purpose, we take the troposphere delays solved by Bernese software using real GNSS data as reference. After that, troposphere delays from products are applied to BeiDou navigation computations, including single point positioning and relative positioning. The positioning results are then compared with that from solutions where the conventional Saastamonien and UNB3 model was used respectively. The results show that elevation dispersion between the interpolation station and the surrounding grid points is the main factor affecting the interpolation accuracy. Different troposphere delay products have performance difference in areas, and VMFG products overall outperform the others. Comparing to conventional Saastamonien and UNB3 models, all products can, to some certain extent, improve the accuracy of BeiDou navigation and positioning.更多还原