中文说明：
在精选波段的频谱分析中，zfft 和 chirp-z 变换是两种常用的方法。对于干扰严重的密集多频谐波分量，通过增加细化倍数和重采样，分离干扰频率分量并进行校正，可以获得高精度的信号参数。
English Description：
In the frequency spectrum analysis of refined band selection, ZFFT and Chirp Z transform are two commonly 2. The methods For dense multi frequency harmonic components with serious interference, ZFFT can obtain high - precision signal parameters by increasing the thinning multiple and resampling, particulary if the frequency components of interference and correcting them.