地空路径统计雨衰减建模的几个问题
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摘要
地空路径雨衰减统计特性是卫星通信等地空无线电系统设计和运行评估的关键参数.针对地空路径统计雨衰减的建模研究,分析了影响模型准确度的几个关键因素,它们包括雨滴谱分布、雨顶高度、降雨率在水平和垂直路径的不均匀性等.同时比较分析了现有主要模型计算的路径调整因子随仰角的变化、与频率的关系等,讨论了现有模型的局限性和可能的改进途径.通过上述对比研究,提出了地空路径雨衰减统计建模向确定性模型方向发展的观点.
The rain attenuation statistics are key parameters for the proper planning and evaluating of earth-space radio systems such as satellite communication systems.The key factors affecting the accuracy of the rain attenuation prediction model on slant path are analyzed herein,which include rain drop size distribution(DSD),rain height,the non-uniformity of rain rate in horizontal and vertical direction,etc.Meanwhile,the dependencies of main rain attenuation models on elevation and frequency are compared and analyzed,and the limitations of the existing models and the approaches of improving the models potentially are discussed.Through the investigation of the above comparison,an opinion is put forward that the tendency of rain attenuation statistics modeling on earth-space path is to the path-specific model.
The rain attenuation statistics are key parameters for the proper planning and evaluating of earth-space radio systems such as satellite communication systems.The key factors affecting the accuracy of the rain attenuation prediction model on slant path are analyzed herein,which include rain drop size distribution(DSD),rain height,the non-uniformity of rain rate in horizontal and vertical direction,etc.Meanwhile,the dependencies of main rain attenuation models on elevation and frequency are compared and analyzed,and the limitations of the existing models and the approaches of improving the models potentially are discussed.Through the investigation of the above comparison,an opinion is put forward that the tendency of rain attenuation statistics modeling on earth-space path is to the path-specific model.
引文
[1]DISSANAYAKE A,ALLNUTT J,HAIDARA F.A prediction model that combines rain attenuation and other propagation impairments along earth-satellite paths[J].IEEE transaction on antennas propagation,1997,45(10):1546-1558.
[2]Rec.ITU-R P.618-11.Propagation data and prediction methods required for the design of earth-space telecommunication systems[S].Geneva:ITU,2013.
[3]ITU-R Doc.3M/29.Proposed modification to recommendation ITU-R P.618-8:an improved model of rain attenuation prediction along earth-space path[R].Geneva:ITU,2003.
[4]ITU-R Doc.3M/27.Prediction of rain attenuation in slant paths and terrestrial links using the full rainfall rate distribution[R].Geneva:ITU,2008.
[5]ITU-R Doc.3J/89.Proposed revision of the recommandation ITU-R P.618-11:a new approach for the effective path-length model for rain attenuation based on rain-cell characteristics:global model[R].Geneva:ITU,2014.
[6]ZHAO Z W,LU C S,LIN L K.ITU-R doc.3J/16and 3M/31:modification to rainfall rate adjustment factor for modelling and prediction methods of rain attenuation statistics[R].Geneva:ITU,2012.
[7]赵振维,卢昌胜,林乐科,等.地空链路雨衰减预测模式研究[J].电波科学学报,2013,28(3):412-419.ZHAO Z W,LU C S,LIN L K,et al.Prediction model of rain attenuation for the earth-space links[J].Chinese journal of radio science,2013,28(3):412-419.(in Chinese)
[8]STUTZMAN W L,DISHMAN W K.A simple model for the estimation of rain-induced attenuation along earth-space paths at millimeter wavelengths[J].Radio science,1982,17(6):1465-1476.
[9]杨红卫,何晨,诸鸿文,等.基于进化神经网络的地空路径雨衰减模型[J].通信学报,2001,22(9):20-27.YANG H W,HE C,ZHU H W,et al.An earthspace rain attenuation model based on evolutionary neural network[J].Journal of china institute of communications,2001,22(9):20-27.(in Chinese)
[10]Rec.ITU-R P.311-14.acquisition,presentation and analysis of data in studies of tropospheric propagation[S].Geneva:ITU,2013.
[11]赵振维.水凝物的电波传播特性与遥感研究[D].西安:西安电子科技大学,2001.ZHAO Z W.Study on radiowave propagation characteristics and remote sensing of hydrometeors[D].Xi’an:Xidian University,2001.(in Chinese)
[12]DAS S,MAITRA A,SHUKLA A K.Rain attenuation modeling in the 10-100 GHz frequency using drop size distributions for different climatic zones in tropical India[J].Progress in electromagnetics research B,2010,25:211-224.
[13]MANDEEP J S,NG Y Y,ABDULLAH H,et al.The study of rain specific attenuation for the prediction of satellite propagation in Malaysia[J].Journal of infrared millimeter&terahertz waves,2010,31(6):681-689.
[14]CHEN K S,CHU C Y,TZENG Y C.A semi-empirical model of rain attenuation at ka-band in northern Taiwan[J].Progress in electromagnetics research M,2011,16:213-223.
[15]ITU-R Doc.3J/131&3M/225.Document on location dependent variations of drop size distributions[R].Geneva:ITU,2015.
[16]ITU-R Doc.3J/138&3M/237.Improvement of the model of rain height in rec.ITU-R P.839-4from ERA interim profile and surface data[R],Geneva:ITU,2015.
[17]Rec.ITU-R P.839-4.rain height model for prediction methods[S].Geneva:ITU,2013.
[18]ITU-R Doc.3J/138&3M/237.Improvement of the model of rain height in Rec.ITU-R P.839-4from ERA interim profile and surface data[R].Geneva:ITU,2015.
[19]赵振维,卢昌胜,林乐科,等.雨衰减预测中的降雨率调整因子概念[J].电波科学学报,2013,28(1):33-38.ZHAO Z W,LU C S,LIN L K,et al.The conception of rainfall rate adjustment factor for the rain attenuation prediction[J].Chinese journal of radio science,2013,28(1):33-38.(in Chinese)
[20]ITU-R Doc.3J/122&3M/215.Contribution to ITU-R study group 3databanks:rain cell statistics from meteorological radar measurement data in Korea[R].Geneva:ITU,2015.
[21]ITU-R Doc.3M/17.Comments on recommendation ITU-R P.618-7[R].Geneva:ITU,2003.
[22]Rec ITU-R P.1812-3.A path-specific propagation prediction method for point-to-area terrestrial services in the VHF and UHF bands[R].Geneva:ITU,2013.
[2]Rec.ITU-R P.618-11.Propagation data and prediction methods required for the design of earth-space telecommunication systems[S].Geneva:ITU,2013.
[3]ITU-R Doc.3M/29.Proposed modification to recommendation ITU-R P.618-8:an improved model of rain attenuation prediction along earth-space path[R].Geneva:ITU,2003.
[4]ITU-R Doc.3M/27.Prediction of rain attenuation in slant paths and terrestrial links using the full rainfall rate distribution[R].Geneva:ITU,2008.
[5]ITU-R Doc.3J/89.Proposed revision of the recommandation ITU-R P.618-11:a new approach for the effective path-length model for rain attenuation based on rain-cell characteristics:global model[R].Geneva:ITU,2014.
[6]ZHAO Z W,LU C S,LIN L K.ITU-R doc.3J/16and 3M/31:modification to rainfall rate adjustment factor for modelling and prediction methods of rain attenuation statistics[R].Geneva:ITU,2012.
[7]赵振维,卢昌胜,林乐科,等.地空链路雨衰减预测模式研究[J].电波科学学报,2013,28(3):412-419.ZHAO Z W,LU C S,LIN L K,et al.Prediction model of rain attenuation for the earth-space links[J].Chinese journal of radio science,2013,28(3):412-419.(in Chinese)
[8]STUTZMAN W L,DISHMAN W K.A simple model for the estimation of rain-induced attenuation along earth-space paths at millimeter wavelengths[J].Radio science,1982,17(6):1465-1476.
[9]杨红卫,何晨,诸鸿文,等.基于进化神经网络的地空路径雨衰减模型[J].通信学报,2001,22(9):20-27.YANG H W,HE C,ZHU H W,et al.An earthspace rain attenuation model based on evolutionary neural network[J].Journal of china institute of communications,2001,22(9):20-27.(in Chinese)
[10]Rec.ITU-R P.311-14.acquisition,presentation and analysis of data in studies of tropospheric propagation[S].Geneva:ITU,2013.
[11]赵振维.水凝物的电波传播特性与遥感研究[D].西安:西安电子科技大学,2001.ZHAO Z W.Study on radiowave propagation characteristics and remote sensing of hydrometeors[D].Xi’an:Xidian University,2001.(in Chinese)
[12]DAS S,MAITRA A,SHUKLA A K.Rain attenuation modeling in the 10-100 GHz frequency using drop size distributions for different climatic zones in tropical India[J].Progress in electromagnetics research B,2010,25:211-224.
[13]MANDEEP J S,NG Y Y,ABDULLAH H,et al.The study of rain specific attenuation for the prediction of satellite propagation in Malaysia[J].Journal of infrared millimeter&terahertz waves,2010,31(6):681-689.
[14]CHEN K S,CHU C Y,TZENG Y C.A semi-empirical model of rain attenuation at ka-band in northern Taiwan[J].Progress in electromagnetics research M,2011,16:213-223.
[15]ITU-R Doc.3J/131&3M/225.Document on location dependent variations of drop size distributions[R].Geneva:ITU,2015.
[16]ITU-R Doc.3J/138&3M/237.Improvement of the model of rain height in rec.ITU-R P.839-4from ERA interim profile and surface data[R],Geneva:ITU,2015.
[17]Rec.ITU-R P.839-4.rain height model for prediction methods[S].Geneva:ITU,2013.
[18]ITU-R Doc.3J/138&3M/237.Improvement of the model of rain height in Rec.ITU-R P.839-4from ERA interim profile and surface data[R].Geneva:ITU,2015.
[19]赵振维,卢昌胜,林乐科,等.雨衰减预测中的降雨率调整因子概念[J].电波科学学报,2013,28(1):33-38.ZHAO Z W,LU C S,LIN L K,et al.The conception of rainfall rate adjustment factor for the rain attenuation prediction[J].Chinese journal of radio science,2013,28(1):33-38.(in Chinese)
[20]ITU-R Doc.3J/122&3M/215.Contribution to ITU-R study group 3databanks:rain cell statistics from meteorological radar measurement data in Korea[R].Geneva:ITU,2015.
[21]ITU-R Doc.3M/17.Comments on recommendation ITU-R P.618-7[R].Geneva:ITU,2003.
[22]Rec ITU-R P.1812-3.A path-specific propagation prediction method for point-to-area terrestrial services in the VHF and UHF bands[R].Geneva:ITU,2013.