两种大区域GNSS网平差方法对比分析  

Comparative analysis of two large area GNSS network adjustment methods

作　　者：梁锡才 尹彤 武慧琳 LIANG Xicai;YIN Tong;WU Huilin(Geology Surveying and Mapping Institute of Guangdong,Guangzhou 510800,China;Institute of Surveying and Mapping Standardization,Ministry of Natural Resources,Xi’an 710054,China)

机构地区：[1]广东省地质测绘院,广州510800 [2]自然资源部测绘标准化研究所,西安710054

出　　处：《导航定位学报》2022年第4期161-168,202,共9页Journal of Navigation and Positioning

摘　　要：在大区域全球卫星导航系统(GNSS)网平差中,基准站的坐标框架和平差历元基准的选择将对成果的绝对精度产生直接影响,针对大区域GNSS网平差中的关键问题,从平差基准框架和历元开展研究和实验分析,讨论了大区域GNSS网平差中空间和时间基准对平差绝对精度的影响,重点分析了瞬时历元平差和固定参考历元平差方法的差异。结果表明,在大区域GNSS网平差中基准站网的平差坐标与观测时刻的坐标必须保持一致性,固定参考历元的平差方法具有局限性,应尽量采用基于瞬时历元平差和速度场推算的方法才能更精确地实现参考框架基准的传递。During the large-area Global Navigation Satellite System(GNSS)network adjustment,the selection of the base stations and the reference epoch with the adjustment coordinates will have a direct impact on the absolute accuracy of the results.Aiming at the key issues in the large-area GNSS network adjustment,the research and experimental analysis are carried out from the adjustment datum frame and epoch,and the influence of space and time datum on the absolute accuracy of adjustment in the adjustment of large-scale GNSS network is discussed,The differences between instantaneous epoch adjustment and fixed reference epoch adjustment are analyzed.The results show that in the adjustment of large-scale GNSS network,the adjustment coordinates of reference station network must be consistent with the coordinates of observation time,and the adjustment method with fixed reference epoch has limitations.The method based on instantaneous epoch adjustment and velocity field calculation should be used as much as possible to realize the transmission of reference frame datum more accurately.

关 键 词：固定历元 瞬时历元 速度场 平差 

分 类 号：P228[天文地球—大地测量学与测量工程]