谱峰法的窗函数选择

导出了单频峰与信号参数的关系，利用这一关系可以完全克服了ＦＦＴ的栅栏现象，因而可大大改善估计精度。论述了多频成分信数估计的谱峰法的合理性。构造了牛顿民线法搜索谱峰的格式，探讨了迭代的初始什选择。

Window Functions of Spectrum Peaking Method

The relationship between spectrum peak and signal parameters for the single-frequency signal is derived,by which FFT barrier can be eleminated completely,hence the estimating precision will be largely improved. The reasonableness of using peaking method to estimate multifrequency signal is expounded. Newton iteration method to search for spectrum peaks is constructed,the iteration initial conditions are discussed,also. The effects of currently used window function are compared on a complex 6-frequence simulation signal,and it is pointed out that Hanning window is most preferable, the second, Goussian window. If the spectrum resolution is interested in, the cosine-rectangular window is fittable. No matter which window will be used,the estimation results show that the peaking method is much more precise than direct FFT method.