JLCORS观测站时间序列随机游走噪声幅度研究

为获得JLCORS观测站坐标时间序列噪声特征,选取网内基岩站、土层站以及楼顶站三种不同类型的观测站作为研究对象,首先进行GNSS数据后处理获得站坐标时间序列,然后利用最大似然估计方法,进行参数估计,对时间序列中随机游走噪声的幅度进行研究。结果显示,基岩站具有最高的稳定性,随机游走噪声幅值约1.73 mm/yr1/2,土层稳定性最低,随机游走噪声幅值约2.24 mm/yr1/2,楼顶站稳定性介于其中,随机游走噪声幅值约2.19 mm/yr1/2。

THE STUDY ABOUT RANDOM WALK NOISE AMPLITUDE OF TIME SERIES FROM JLCORS OBSERVATION STATION

In order to obtain the noise characteristics of the coordinate time series of JLCORS observation station, three different types of observation stations are as the research object, the bedrock station, the soil layer station and the roof station, were selected to obtain the coordinate time series of GNSS data. Then the maximum likelihood estimation method was used to study the amplitude of random walk noise in time series. The results show that the bedrock station has the highest stability, the random walk noise amplitude is about 1.73 mm/ yr1/2, the soil station stability is the lowest, the random walk noise amplitude is about 2.24 mm/yr1/2, the stability of the roof station is between them, and the random walk noise amplitude is about 2.19 mm/yr1/2.