复杂地形区ZTD时空特性与格网建模  

Spatiotemporal Characteristics and Grid Modeling of ZTD in Complex Topography Areas

作　　者：滕焕乐[1] 曹成度[1] 闵阳[1] 张恒玉 冯威 冯光东[1] 黄丁发 TENG Huanle;CAO Chengdu;MIN Yang;ZHANG Hengyu;FENG Wei;FENG Guangdong;HUANG Dingfa(China Railway Siyuan Survey and Design Group Co.Ltd,Wuhan 430063,China;Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,湖北武汉430063 [2]西南交通大学地球科学与环境工程学院,四川成都611756

出　　处：《测绘科学技术学报》2021年第6期551-556,562,共7页Journal of Geomatics Science and Technology

基　　金：中国铁建股份有限公司重大专项(2019-A02)。

摘　　要：为了解复杂地形条件下天顶对流层延迟(ZTD)特性并研究其精细化建模,采用四川省56个CORS站的数据,解算其高精度ZTD并对3种不同ZTD模型的精度进行评估,分析了ZTD时空分布特性受地形条件、季节因素的影响。基于ERA-Interim再分析数据建立了区域ZTD格网模型及其精化方法。实验结果表明:1)ZTD随地形分布的变化幅度大,模型的偏差分布也呈现出显著的不一致性,其中Saastamonien模型非常适合四川地区ZTD建模,RMS和BIAS分别为4.6、3.9 cm;2)ERA-Interim再分析数据建立的四川区域的格网模型ZTD与GNSS ZTD的偏差均值仅为0.6 cm,相较Saastamonien模型5 cm的偏差均值,有显著改进,两者具有良好的一致性;3)通过对四川区域的格网模型ZTD和GNSS实测ZTD的偏差使用精细化建模改进,格网模型的平均偏差由1.9 cm缩减至0.5 cm。In order to study the characteristics of the Zenith Tropospheric Delay(ZTD) in complex topography area and explore its refined model, the measurements from 56 continuously operating reference stations in Sichuan province are used to obtain the high-precision ZTD. The accuracy of three empirical ZTD models are evaluated, and the temporal and spatial distribution characteristics of ZTD in different terrains and seasons are analyzed. Based on the ERA-Interim reanalysis data, the regional ZTD grid model and the refinement method are established. Experimental results show that the ZTD varies dramatically with terrain distribution, and the deviation distribution also shows significant inconsistency. Saastamonien model is ideally suitable for ZTD modeling in Sichuan, and the RMS and BIAS are 4.6 and 3.9 cm, respectively. The average deviation of the grid model ZTD and GNSS ZTD in Sichuan established by ERA-Interim reanalysis data is only 0.6 cm, which is a significant improvement compared with 5 cm average deviation of the Saastamonien model, and both of them have good consistency. By employing a refined model for the deviation between the grid model ZTD and the GNSS ZTD in Sichuan, the average deviation of the grid model is reduced from 1.9 cm to 0.5 cm.

关 键 词：天顶对流层延迟 复杂地形 再分析数据 格网模型 对流层模型精化 

分 类 号：P228[天文地球—大地测量学与测量工程]