方向性指数 meaning in Chinese

directyvity index

Lt is obvious that the decaying rule of average reverberation intensity is affected by scattering coefficient of sea floor , sound speed profile , inclination of bottom etc . the sea floor scattering function is the most importan factor to the intensity decaying rule
结果表明：海底散射方向性指数因子、海水声速梯度、海底倾斜角等对海洋混响平均强度的衰减皆有影响。海底散射方向性指数因子对其影响最大，即适当选取海底散射模型是浅海近程混响建模的首要因素。