标准大气模型建立映射函数的可靠性讨论

随着新空间技术观测精度的不断提高，大气传播误差的研究已经成为改进观测精度的主要途径之一．为了提高大气延迟改正映射函数的计算精度，在大气剖面的选取上，近年来已经开始从过去的模型大气，逐渐地向实测大气转变．结合个别具有代表性的探空气球站观测资料，比较用标准大气模型建立的映射函数与探空气球资料路径积分的结果，研究用标准大气模型建立映射函数的可靠性，并简单讨论在映射函数中地球物理参数选择的若干问题．

Discussion on the Reliability of the Mapping Function from Standard Atmosphere

With the development of the modern space techniques, the errors of atmospheric refractive delay has become one of the main keys in improving computation accuracy. In order to reduce the influence of the selection of atmospheric profile on the mapping function of atmospheric refractive delay, the adopted atmospheric profile has gradually changed from theoretical atmosphere models (Marini 1972, Davis et al. 1985, Yan and Ping 1995) to radiosonde atmospheric profiles (Herring 1992. Niell 1996.Mendes et al. 2002). Incorporated with two representative radiosonde stations data, it has compared the mapping functions from the Standard Atmosphere with that from radiosonde data ray-tracking technique, and assessed the reliability of the mapping function from the Standard Atmosphere. A brief discussion on the choice of meteorological and geophysical parameters has been made by simulation computations.