基于射线分层算法的电磁波大气吸收衰减特性分析  

Characteristic Analysis of Atmospheric Absorption and Attenuation Based on Rays Layering Algorithm

作　　者：李德鑫[1,2] 杨日杰[1] 孙洪星 官巍 

机构地区：[1]海军航空工程学院电子信息工程系,山东烟台264001 [2]空军哈尔滨飞行仿真技术研究所,哈尔滨150001

出　　处：《电讯技术》2012年第1期80-85,共6页Telecommunication Engineering

基　　金：航空科学基金资助项目(20095184005);山东省"泰山学者"建设工程专项经费资助项目~~

摘　　要：针对电磁波在大气中传播的衰减问题,给出了基于大气温度、密度、压强及吸收谱线强度等经验公式的大气吸收衰减系数模型,提出了基于射线分层算法的传播吸收衰减模型,弥补了传统算法在处理非均匀大气及等效积分路径的不足,提高了算法在非均匀大气条件下的计算精度,扩大了算法的适用范围。通过数值计算分析了电波频率、传播仰角、观测距离等因素与大气吸收衰减之间的关系,并给出典型情况下的图表计算结果,可为后续工作提供理论依据和数据支撑。According to the attenuation problem of electromagnetic wave in atmosphere, the attenuation coefficient model of atmospheric absorption is provided based on experience formulas of atmospheric temperature, density, pressure and absorption spectrum line strength. The spread absorption and attenuation model are put forward based on rays layering algorithm, which makes up for shortcomings of the traditional algorithm in dealing with non-uniform atmosphere and equivalent integration path, improves the calculation accuracy in non-uniform atmospheric condition, and expands application scope of algorithm. Through the numerical calculation, the relations between the wave frequencies, the elevation, observation distance spread factors such as atmospheric absorption and attenuation are analysed. Furthermore, the calculation results are given in the form of figures and tables, which provides theory basis and data support for future work.

关 键 词：电磁波 传播衰减 大气吸收 大气折射 射线描迹 射线分层算法 

分 类 号：TN011.3[电子电信—物理电子学]