基于改进EMD方法的系统误差分离方法研究

摘要

Systematic error has a complicated transformation property in measuring system.The separation of systematic error is one of the most important matters in measuring system.In order to break the restrictions of traditional methods,an improved empirical mode decomposition (EMD)was used in the process of separating systematic error.The endpoints continuation based on the degree of wave similarity was put forward to restrain the end effect.The cumulative percent variance was regarded as one of the separation stopping criteria.The results of simulations and a real example imply that the improved EMD brings a good effect on the separation.%针对测量中系统误差存在复杂的变化规律，将改进的经验模态分解（EMD）方法用于系统误差分离过程，突破传统分离方法限制。采用基于波形相似度的端点延拓方法有效抑制端点效应；基于累计方差贡献率的分解停止准则，合理确定停止时机。仿真与实例分析结果表明，改进的经验模态分解方法在系统误差分离中效果较好。