中文说明：应用背景他的主要特点为从噪声中将所需要的周期信号的特征以功率谱的形式表征出来，通过设置合适的阈值可以代表目标。调频信号则是典型的脉冲压缩信号，其扩频特性使得其不易受噪声干扰关键技术%% test the compressing characters of the chirp%% TestChirpCompression周期图法的优点是能应用离散傅里叶变换的快速算法来进行估值。对利用式(1)、(2)得到的功率谱估值进行傅里叶反变换，可以得到信号的自相关函数估值。这种方法适用于长信号序列的情况，在有足够的序列长度时，应用改进的周期图法，可以得到较好的功率谱估值，因而应用很广。
English Description：
Application backgroundHis main feature is that the characteristics of the periodic signal is characterized by the power spectrum. The FM signal is a typical pulse compression signal, and its spreading characteristics make it difficult to be interfered by noise.Key Technology%% & nbsp; test the compressing characters of the chirp%% & nbsp; advantages of TestChirpCompression periodogram method is using discrete Fourier transform fast algorithm to valuation. The Fourier inverse transform is used to estimate the power spectrum obtained by using the formula (1) and (2), and the autocorrelation function of the signal can be estimated. This method can be applied to the long signal sequence, and it can be used to estimate the power spectrum by using the modified method, which can be used to estimate the power spectrum.