利用陆态网络连续GNSS资料分析流动站速率精度与可靠性

Analysis of Accuracy and Reliability for Campaign GNSS Sites Based on CMONOC Continuous GNSS Data

利用中国大陆构造环境监测网络(陆态网络)的GNSS连续站资料,分析GNSS流动站观测的精度与可靠性,研究时间跨度、观测周期以及观测时长对速率精度的影响。结果表明,时间跨度对流动站速率精度的影响显著,观测时间越长,流动站速率越接近连续站。按照陆态网络目前每2a观测1期的模式,当时间跨度达到16a时,流动站与连续站速率差异的标准差在水平方向约为0.1mm/a,垂直方向约为0.3mm/a。不同观测时长对流动站水平速率差异的影响基本小于0.15mm/a,垂直方向小于0.45mm/a。当观测时长大于或等于3d时,在水平方向的速率差异的标准差小于0.1mm/a。在时间跨度、观测时长一定时,观测周期越短,流动观测站结果越接近连续观测站结果。

Using continuous GNSS data from the crustal movement observation network of China, we analyze the accuracy and reliability of campaign GNSS stations, and the impact of time span, observation period and observation days for the site velocity. Our results show that. time span has significant impact on the velocity precision of campaign sites. When the time span is about 16 years and the ob- servation period is 2 years for one campaign, the standard deviation of the differences between the campaign and continuous sites is about 0.1 mm/a for the horizontal component, and 0.3 mm/a for the vertical component. Further, the impact of observation days on the differences is less than 0.15 mm/ a for the horizontal component and 0.45 mm/a for the vertical component. Besides, with the given time span and observation days, shortening the observation period could improve the accuracy of the campaign GNSS sites.