CAJ | 학술논문

在对比离散频谱能量重心法采用不同点数时的频率、幅值和相位校正精度的基础上提出了4点能量重心校正法,推导了高斯白噪声背景下单频率谐波信号采用4点能量重心法进行频率、幅值和相位校正的统计方差公式,通过仿真计算验证了其正确性.分析对比了采用不同点数进行能量重心校正时的优缺点,建议在工程中采用Han-ning窗4点能量重心法进行谐波信号离散频谱校正.
재대비리산빈보능량중심법채용불동점수시적빈솔、폭치화상위교정정도적기출상제출료4점능량중심교정법,추도료고사백조성배경하단빈솔해파신호채용4점능량중심법진행빈솔、폭치화상위교정적통계방차공식,통과방진계산험증료기정학성.분석대비료채용불동점수진행능량중심교정시적우결점,건의재공정중채용Han-ning창4점능량중심법진행해파신호리산빈보교정.
The energy centrobaric correction method is based on the fact that energy center of symmetric window function is the center frequency of the window in discrete spectrum analysis. Since the Hanning window energy is mainly concentrated on the main-lobe, an approach of utilizing 4 spectral samples in the main-lobe of the Hanning window to correct spectral parameters is proposed. Analytical expressions of the estimator variances for frequency, amplitude and phase correction are derived; and simulation results confirm the validity of the presented method. The properties of utilizing different quantity of spectral lines in the energy centrobaric correction are analyzed with respect to their noise sensitivity. Comparing with those using 3 or 5 spectral samples in the main-lobe of the Hanning window, the method of utilizing 4 spectral samples provides superior accuracy in parameters estimation, which is more practical in engineering application.