等效地球半径法应用中的问题

Problems in earth's equivalent radius method application

为阐明等效地球半径法应用的范围和应用中应该注意的问题,从等效地球半径法的定义推导了等效地球半径模型与实际地球模型之间量的映射关系.给出并证明了等效过程中等效地球半径模型与实际地球模型下的射线高度、仰角、长度相等,而地心角在转换过程中约为3/4的映射关系.讨论了需要利用地心角映射关系进行计算时的两种情况,同时给出计算结果和误差分析.

To ravel the application range and some noticeable problems of the earth s equivalent radius method during using this model to simply calculate the atmospheric refraction of radio waves, the mapping relationships of the variables between the earth's equivalent radius model and the original earth model were derived from the definition of the earth' s equivalent radius method. The calculation results show that the height, elevation and range of ray is equal in the two models, geocentric angle keeps a rate about 3/4 in the equivalent procedure. The height, elevation and range of a radar ray in the earth' s equivalent radius model can be directly used to replace the relevant parameters in the original earth model. The Geocentric angle should be avoided as possible. Two samples were given to discuss the cases when the geocentric angle must be used, as well as the results and error analyses.