Time series predictor of Ku band rain attenuation over an Earth–space path at a tropical location
Time series predictor of Ku band rain attenuation over an Earth–space path at a tropical location
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热带地区地空路径上 Ku 波段雨衰的时间序列预测
DOI：
10.1002/sat.992
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发表时间：
2012
影响因子：
1.7
通讯作者：
A. Maitra
中科院分区：
文献类型：
--
作者：
D. Das;A. Maitra
提出了一种预测热带地区降雨过程中Ku波段降雨衰减时间序列的通道模型。该模型基于考虑降雨衰减条件发生的高斯分布，且衰减发生前有特定值。用实验数据对分布的均值（μ）和标准差（σ）建模。利用测量到的某一时刻的衰减量，可以得到μ和σ，并预测某一间隔后的衰减量。该信道模型经过了良好的测试，其预测衰减与实测值一致，平均误差比1db高15%以内。在长期的基础上，用衰减发生的一阶和二阶统计量来检验模型的有效性。即使在一段时间内没有衰减测量，误差增加的情况下，也可以应用该方法。版权所有©2011 John Wiley & Sons， Ltd
A channel model is proposed to predict the time series of Ku band rain attenuation during a rain event at a tropical location. The model is based on considering the Gaussian distribution of the conditional occurrence of rain attenuation with a particular value of the attenuation occurring before. The mean (μ) and standard deviation (σ) for the distribution are modeled with the experimental data. The measured attenuation at a particular time instant is used to obtain μ and σ and to predict the attenuation after certain interval. The channel model has tested well giving the predicted attenuation that agrees with the measured value with a mean error within 15% higher than 1 dB. Validity of the model is also tested with the first‐order and second‐order statistics of attenuation occurrence, on a long‐term basis. The method can also be applied even if attenuation measurements are missing for certain period of time with increased error. Copyright © 2011 John Wiley & Sons, Ltd.