本标准描述了通过使用规定的几何形状和两个麦克风同时瞬时声压信号之间差值的平均值，对两个垂直分离麦克风的声压级进行现场测量，从而获得地面归一化声阻抗比实部和虚部的程序。它使用户既可以通过将光谱数据拟合到模板来推断地面阻抗模型的参数，也可以完全通过测量和分析获得地面的归一化比声阻抗比的值 与地面声阻抗的任何模型无关，但检查结果值的有效性除外。

This Standard describes procedures for obtaining the real and imaginary parts of the normalized acoustic impedance ratio of ground surfaces fromin-situmeasurements of the sound pressure levels at two vertically separated microphones using specified geometries and the averaged values of the difference between the simultaneous, instantaneous sound-pressure signals at the two microphones. It enables the user to either deduce parameters for a ground impedance model by fitting spectral data to templates or obtain values of the normalized specific acoustic impedance ratio of the ground entirely from measurements and independently of any model for the acoustic impedance of the ground surface except as a check on the validity of the resulting values.