Amplitude correction was dependent upon spectral functions of window functions, when the phase difference correction method was employed to correct frequency spectra. However, many window functions were very complex actually and the analytic expressions of their spectral function could not be obtained. A novel amplitude correction method was proposed here. After frequency correction value was calculated based on the phase difference correction method, a new numerical sequence could be obtained by multiplying the original sequence with a complex number sequence produced by the frequency correction value. Then, the signal frequency of the new sequence just aimed at a certain spectral line, and the frequency spectral analysis didn't cause a leak for frequency spectra. So, the amplitude correction didn't depend on the spectral functions of window functions. Numerical simulation results and application examples demonstrated that the ideal correction precision can be reached even for frequency spectra with dense distribution by using the proposed method and choosing an appropriate window function.%采用相位差校正法进行频谱校正,对幅值进行校正需要依赖于窗函数的谱函数.而实际上很多窗函数都十分复杂,其谱函数的解析表达式难以取得.该文提出基于相位差法取得频率修正量后,可以将原加窗序列乘以一个由频率修正量产生的复数序列,相当于进行一个小的频移,产生一个新的序列.新序列的信号频率正好对准离散频谱上的某一根谱线,不会产生泄漏.因此在幅值校正时不需要依赖窗函数的谱函数,通用性好.仿真研究和应用实例表明,采用该文提出的方法,选择合适的窗函数,即使是密集分布的频谱,也可以达到理想的校正精度.
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