次周日周期信号对GNSS时间序列长周期项的影响

摘要

The influence of the subdaily signal represented by the multipath on the characteristics of the short baseline time series is evaluated in this paper.Results show that multipath will introduce spurious signals for a long period with amplitude 0.1～0.3 mm in the height direction,but little in the plane direction.Unmodeled elevation-dependent subdaily signals will introduce spurious long period signals to the daily coordinate time series in the direct component,but the spurious amplitude can be decreased by increasing the cutoff of elevation properly.%评估以多路径效应为代表的次周日周期信号对短基线时间序列的影响,结果表明,多路径效应在序列高程方向上引入0.1～0.3 mm虚假长周期信号,而对平面方向的贡献不大;与高度角有关的未模型化的次周日信号在单日解时间序列高程方向引入的虚假长周期信号不可忽略,适当提高截止高度角可予以减弱.