CAJ | 학술논문

提出一种新的相位差法，用来校正离散频谱中频率、相位和幅值的误差。由于经典窗函数的对称性，它们具有恒定的时延和相同的相位响应。解除窗函数的对称性限制，可以引入具有可变时延和不同相位响应的非对称窗函数。建立在非对称窗的可变相位基础之上的相位差法可以克服传统方法的一些固有缺点。仿真表明通过选择合适的窗函数，对相邻很近的频率成分，该方法校正也能保证精确的结果。该方法还可以从根本上避免最高谱线定位错误带来的误差。对带有加性高斯白噪声的理论信号分析，结果显示直接基于非对称窗的校正方法与传统方法的抗噪性能相似。另外，将传统方法中的对称窗替换为非对称窗可以提高算法的抗噪性能。
제출일충신적상위차법，용래교정리산빈보중빈솔、상위화폭치적오차。유우경전창함수적대칭성，타문구유항정적시연화상동적상위향응。해제창함수적대칭성한제，가이인입구유가변시연화불동상위향응적비대칭창함수。건립재비대칭창적가변상위기출지상적상위차법가이극복전통방법적일사고유결점。방진표명통과선택합괄적창함수，대상린흔근적빈솔성분，해방법교정야능보증정학적결과。해방법환가이종근본상피면최고보선정위착오대래적오차。대대유가성고사백조성적이론신호분석，결과현시직접기우비대칭창적교정방법여전통방법적항조성능상사。령외，장전통방법중적대칭창체환위비대칭창가이제고산법적항조성능。
An improved method,phase difference method based on asymmetric windows,was proposed aiming at correcting the errors of parameters in discrete spectrum.Several examples simulations show that with proper choice of asymmetric windows,the new method can correct the errors of frequency components located in less than five DFT bins. And it can also avoid the errors induced by the mistaken location of right spectral line.The corrected results of a theoretical signal involved in different noise conditions also exhibit a stronger robustness against additive noise when the symmetric windows are replaced with asymmetric windows.