中文摘要：

为解决微波链路抗雨衰技术中动态雨衰减预测问题,利用增强MB模型模拟了中国典型的温带和亚热带雨区的12.5GHz雨衰减时间序列,并与实测雨衰序列的功率谱进行了比较,一致性很好,但降雨衰落斜率统计结果之间有差异.用循环插入法对增强MB的模拟进行修正,统计分析了雨衰落斜率和衰落持续时间的概率,结果显示,根据修正模拟数据与测量数据统计的衰落斜率有好的一致性,基于修正模拟数据的降雨衰落持续时间的统计也更接近于基于实测数据的统计结果和国际电信联盟无线电分委员会模型预测结果.表明该修正模型可用于中国典型雨区动态雨衰减的预测.

英文摘要：

In ordor to investigate the dynamic rain attenuation forecast in countermeasure rain fade techniques on the microwave link,in typical temperate and subtropical rain areas in China,the power spectra for the rain attenuation time series simulated by the EMB（Enhanced Maseng and Bakken）model are in agreement with the measured results at 12.5GHz,but there are differences between the fade slopes statistics based on simulated series and measured data.The rain attenuation time series by the EMB model are improved by using a circular inserting data method.By the improved method,the statistical probabilities of the fade slopes are very close approximation to the measured results.The probabilities of the fade duration based on the simulated time series by the improved processes are compared with the results by unimproved processes,the results based on the measured data and by the ITU-R predicted results.It is shown that the statistical results for the fade slopes are improved,and that the differences between the fade duration probabilities by the improved series and measured data are smaller than that between the results by unimproved and measured.The results show that the improved process to the EMB model is feasible in typical rain areas in China.