天津地区连续GNSS时序观测值共模误差识别

Identification of Common-Mode Error Based on Tianjin GNSS Time Series Data

为了恰当地识别共模误差并对观测结果进行修正,提出了均值-小波法。天津地区全球导航卫星系统(GNSS)时序观测资料的计算表明下列4点:1)在一定程度上共模误差是可识别和分离的;2)在局部区域上可较精确地剔出共模误差中的白噪声闪烁噪声;3)共模误差在GNSS观测值误差中占主要成份,测站综合噪声、共模噪声和自身噪声的比例关系约为1∶0.83∶0.54;4)通过修正后观测值信噪比可显著提高。

In order to identify appropriately the common-mode error, and to modify the observation results, the mean-wavelet method, theoretical analysis and computing of GNSS time series data in Tianji area suggest have been proposed： 1） common-mode error can be identified and separated to a certain extent; 2） white noise and flicker noise of common-mode error can be excluded accurately in local region; 3） common-mode error is the main component of GNSS observation error, and the proportion relation of integrated noise, common-mode noise and station itself noise is about 1 ： 0.83 ： 0.54; 4） signal-to-noise ratio can be improved significantly through modification.