非建模系统误差是影响整周模糊度固定的一个重要因素。在现有经验模态分解理论的基础上,定义经验模态分解的多尺度分解与重构结构,依据累积标准化模量的均值随尺度的变化确定非建模系统误差与噪声分离尺度的选择标准,分离出双差观测值残差序列中的系统误差,并对初始双差观测值进行修复,得到去除系统误差后的双差观测值序列。比较系统误差消除前后LAMBDA方法求解整周模糊度固定的速度、可靠性和搜索空间,结果表明:利用经验模态分解方法消除系统误差后,LAMBDA方法求解整周模糊度固定的速度和可靠性明显提高,搜索空间得到一定优化。
As un-modeling system errors are considered significant factorsaffecting integer ambiguity fixed,the empi-rical mode decomposition(EMD) technique is employed in the paper,which is a new signal processing method for non-linear time series.EMD technique can decomposes a time seies into a finite and often small number of intrinsic mode functions(IMFs).The decomposition procedure is adaptive and data-driven which is suitable for non-linear data series analysis.A multi-scale decomposition and reconstruction arch...