An exponential attenuation model of main peak about white noise's ambiguity function is analyzed, and the numerical formula of the model is deduced.
分析适用于模糊区与近似清晰区的白噪声模糊函数中心主峰附近的指数衰减模型，推导了模型参数的数值计算公式。
Considering the nonlinear affects of various parameters on rain attenuation, we propose a new rain attenuation model based on evolutionary neural network and compare it with the ITU-R model.
本文在考虑多个参数对雨衰减非线性影响的基础上，建立了基于进化神经网络的雨衰减模型，并与ITU - R模型进行了比较。
Thirdly, on the base of "virtual distance attenuation", the paper brings forward a forecasting model of the CS of tourism websites—virtual distance weighing.
第三部分，首先根据旅游网站使用者满意度的“虚拟距离衰减”规律，引深提出了旅游网站使用者满意度的预测模式——“虚拟距离衡量法”。
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