摘要
针对能量密度谱判断噪声与信号主导模态分界点性能不稳定的问题,该文提出基于夹角余弦的分界点判断方法。该方法首先利用EEMD对CORS站高程数据进行分解,其次计算原始信号与各阶模态分量的夹角余弦值,最后根据夹角余弦值的首次逆向转折位置判定噪声主导模态和信号主导模态的分界点。以4个CORS基准站近20年原始高程时间序列信号为研究对象,对噪声与信号模态分量分界点进行判定,实验结果表明采用基于夹角余弦的判定方法可以一次判断出噪声和信号模态分量的分界点。该方法应用到CORS站高程信号与噪声序列的识别中性能更加稳定。
This paper proposes a method for judging the boundary point based on the cosine of the angle,aiming at the problem of Energy density spectrum judges noise and signal dominant mode boundary point performance instability.The method first uses EEMD to decompose the elevation data of the CORS station.Secondly,calculate the angle cosine of the original signal and each modal component.Finally,the boundary point between the dominant mode of the noise and the dominant mode of the signal is determined according to the first reverse turning position of the cosine of the angle.Taking the original elevation time series signals of four CORS reference stations for nearly 20 years as the research object,the boundary points between noise and signal modal components are determined.The experimental results show that the boundary between the noise and the signal modal component can be judged once by using the angle-based cosine-based decision method.The performance of this method is more stable when applied to the recognition of elevation signal and noise sequence of CORS station.
作者
吉长东
吕广涵
张恒璟
崔东东
JI Changdong;LYU Guanghan;ZHANG Hengjing;CUI Dongdong(School of Geomatics,Liaoning Technical University,Fuxin,Liaoning 123000,China;Chinese Academy of Surveying and Mapping,Beijing 100036,China)
出处
《测绘科学》
CSCD
北大核心
2021年第3期8-16,共9页
Science of Surveying and Mapping
基金
中国测绘科学研究院基本科研业务费项目(AR1918)
辽宁省教育厅青年项目(LJ2017QL008)。
