最大似然（ML）准则和最大后验概率（MAP）准则，旋转机械二维全息谱计算，可以得到很精确的幅值、频率、相位估计。- Maximum Likelihood (ML) criteria and maximum a posteriori (MAP) criterion, Rotating machinery 2-d holographic spectrum calculation, You can get a very accurate amplitude, frequency, phase estimation.