随机信号的统计特性测试,均值、方差，相关函数（包括自相关、互相关函数）、频谱及功率谱密度算法.-The statistical properties of random signal test, mean, variance, correlation function (including autocorrelation, cross-correlation function), spectrum and power spectral density algorithms.

psd函数求功率谱密度并与davenport谱比较-The power spectral density of PSD function and comparison with Davenport spectrum