GNSS对流层湿延迟随机游走过程噪声时空变化特征分析  

Analysis of spatiotemporal variation characteristics for GNSS tropospheric wet delay random walk process noise

作　　者：裴雪艳 张兴刚[1] 荆文芳[1] PEI Xue-yan;ZHANG Xing-gang;JING Wen-fang(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院大学,北京100049

出　　处：《时间频率学报》2024年第2期139-152,共14页Journal of Time and Frequency

基　　金：国家自然科学基金(E00ZK1701)。

摘　　要：全球导航卫星系统GNSS对流层天顶湿延迟(zenith wet delay,ZWD)随机噪声不仅影响ZWD估计值大小,还会影响ZWD的趋势项变化。为揭示ZWD随机游走过程噪声(random walk process noise,RWPN)的时空变化特征,本文选取全球20个IGS(International GNSS Service)测站,基于JPL(Jet Propulsion Laboratory)、GFZ(Helmholtz-Centre Potsdam-German Research Centre for Geosciences)和CODE(Center for Orbit Determination in Europe)分析中心2010至2020年对流层产品,从不同地理位置和不同时间序列分析GNSS ZWD随机游走过程噪声的变化范围和特征;并且在扣除ZWD的趋势项和主要周期项后,进一步揭示了ZWD残差信号分量构成。结果表明:不同地理位置湿延迟RWPN具有显著差异,年均值范围在0.01~0.146 mm/√s之间,且在大气集中的中低纬地区湿延迟RWPN值较大,在大气相对稀薄的极地地区其值较小;同一测站的湿延迟RWPN具有明显的周年、半周年和季节性特征,极差值高达0.12 mm/√s以上;通过对ZWD残差值分析,发现ZWD残差信号除包含白噪声外,还具有4.8 h至2.43 d的高频信号分量。The random noise of GNSS tropospheric zenith wet delay(ZWD)not only affects the estimated value of ZWD,but also affects the change of the trend item of ZWD.In order to reveal the temporal and spatial variation characteristics of ZWD random walk process noise(RWPN),this paper selects 20 IGS(International GNSS Service)stations and used the tropospheric products of JPL,GFZ and CODE analysis center from 2010 to 2020 to analyze the range and characteristics of noise in the GNSS ZWD random walk process from different geographical locations and different time series;and after deducting the ZWD trend item and the main period item,the composition of the ZWD residual signal component is further revealed.The results show that there are significant differences in the wet delay RWPN in different geographic locations,with the annual average value ranging from 0.01 to 0.146 mm/√s,and the wet delay RWPN value is larger in the middle and low latitudes where the atmosphere is concentrated,and in the polar regions where the atmosphere is relatively thin,its value is small;the wet delay RWPN at the same station has obvious annual,semi-annual and seasonal characteristics,and the range value is as high as 0.12 mm/√s or more;through the analysis of the ZWD residual value,it is found that the ZWD residual signal not only includes the white noise,there are also high-frequency signal components from 4.8 hours to 2.43 days.

关 键 词：对流层 全球导航卫星系统 湿延迟 随机游走过程噪声 时空变化 数值天气模型 

分 类 号：P228.4[天文地球—大地测量学与测量工程]