摘要
针对全球定位系统(GPS)连续站坐标时间序列噪声模型已在中国大陆构造环境监测网络(CMONOC)中得到广泛的研究与应用,但有关日本地区全球定位系统永久性跟踪站网(GEONET)噪声模型的研究甚少的问题,基于GEONET基准站资料,利用极大似然估计和保守估计准则,建立日本地区最佳噪声模型,并分别利用U检验和速度误差理论,就噪声模型对速度及误差的影响进行详细了分析。结果表明,GEONET各坐标分量具有不同的噪声特性,东(E)、北(N)分量主要表现白噪声与闪烁噪声组合、白噪声与幂律噪声组合;垂直(U)分量主要表现白噪声与幂律噪声组合;相关噪声模型对速度影响较小,在95%置信度下,白噪声与相关噪声估计的速度相等;忽略相关噪声会使速度误差的估计过于乐观,且不同的相关噪声模型估计的速度误差存在一定时变差异性,随着坐标序列跨度的递增而逐步增大。同时,利用相关噪声参数建立的速度误差模型表明,建立日本亚毫米级GPS速度场,E、N分量坐标序列跨度不应低于3 a,U分量不应低于8 a。
Aiming at the problem that Global Positioning System(GPS) continuous station coordinate time series noise model has been widely studied and applied in Crustal Movement Observation Network of China(CMONOC), but there is little research on the noise model of GPS Earth Observation NETwork system(GEONET) in Japan, based on GEONET reference station data,the best noise model in Japan is established by using maximum likelihood estimation and conservative estimation criteria, and the influence of noise model on velocity and error is analyzed in detail by using U-test and velocity error theory respectively. The results show that each coordinate component of GEONET has different noise characteristics. The east(E) and north(N) direction components mainly show the combination of white noise and flicker noise, white noise and power-law noise;the vertical(U)direction component is mainly composed of white noise and power-law noise. The correlation noise model has little effect on the velocity. Under 95% confidence, the velocity of white noise and correlation noise is equal;ignoring the correlation noise will make the estimation of velocity error too optimistic, and there is a certain time-varying difference in the estimation of velocity error of different correlation noise models, which gradually increases with the increasing span of coordinate sequence. At the same time, the velocity error model established by using relevant noise parameters shows that the span of E, N direction component coordinate sequence should not be less than 3 a, and U direction component should not be less than 8 a when establishing Japan millimeter GPS velocity field.
作者
任安康
徐克科
邵振华
REN Ankang;XU Keke;SHAO Zhenhua(School of Surveying and Land Information Engineering,Henan Polytechnic University,Jiaozuo,Henan 454000,China)
出处
《导航定位学报》
CSCD
2022年第2期141-151,共11页
Journal of Navigation and Positioning
基金
国家自然科学基金项目(41774041)。
关键词
坐标时间序列
全球定位系统
永久性跟踪站网
极大似然估计
随机游走
闪烁噪声
coordinate time series
global positioning system
Earth observation network system
maximum likelihood estimate
random walk
flicker noise
