CAJ | 학술논문

针对脉冲星信号的消噪问题,提出了一种基于模态单元比例萎缩的经验模态分解(EMD)消噪方法.利用经验模态分解将含噪脉冲星信号分解为一组内蕴模态函数(IMF),将IMF中两个过零点间的部分定义为模态单元,以模态单元为基本单位构造最优比例萎缩因子,对IMF中的每个模态单元进行比例萎缩去噪,进而建立基于模态单元比例萎缩的脉冲星信号滤波模型.对含噪脉冲星信号进行了消噪实验分析,实验结果表明,与小波硬阈值消噪法、比例萎缩小波消噪法和基于模态单元阈值的EMD消噪法相比,该方法可以更有效地去除脉冲星信号中的噪声,同时更好地保留了原信号中的有用细节信息.
침대맥충성신호적소조문제,제출료일충기우모태단원비례위축적경험모태분해(EMD)소조방법.이용경험모태분해장함조맥충성신호분해위일조내온모태함수(IMF),장IMF중량개과영점간적부분정의위모태단원,이모태단원위기본단위구조최우비례위축인자,대IMF중적매개모태단원진행비례위축거조,진이건립기우모태단원비례위축적맥충성신호려파모형.대함조맥충성신호진행료소조실험분석,실험결과표명,여소파경역치소조법、비례위축소파소조법화기우모태단원역치적EMD소조법상비,해방법가이경유효지거제맥충성신호중적조성,동시경호지보류료원신호중적유용세절신식.
@@@@In order to improve the denoising quality of the pulsar signal, an empirical mode decomposing method (EMD) of pulsar signal denoising based on mode cell proportion shrinking is proposed. Firstly, the pulsar signal is decomposed into a series of intrinsic mode functions (IMF), and the part between the two adjacent zero-crossing within IMF is defined as a mode cell. Then, the optimal proportional shrinking factor is constructed by treating mode cell as the basic unit of analysis. Finally, the all mode cells within IMF are denoised by proportion shrinking, and the mode cell proportion shrinking denoising model is established. The experimental results show that compared with the two EMD denoising algorithms based on coefficient threshold and mode cell threshold, the proposed method can more effectively remove the pulsar signal noise, with better preserving the useful detail information in the original signal.