摘要
自从新空间技术问世以来，大气传播误差的研究已经成为提高观测精度的主要课题之一。作为最新大气延迟映射函数之一的Niall模型[1]（NMF）已经在归算过程中受到重视[2]。利用探空气球资料沿光程数值积分方法并在理论上分析了NMF模型的优点和缺点，认为：Niell利用探空气球资料来建立大气折射映射函数的方法有它的合理因素，例如可以建立一个台站或一个地区的映射函数；但是，即使利用充分多的探空气球资料，要建立高精度的“全球’才气延迟映射函数还存在着很大的困难。
Since the establishments of the modem space techniques, it has been proved that the errors of atmospheric refractive delays of signals was the main error souroes constraining improvement of observational accuracies in geodyndrics researehes. As one of the recent new mapping functions, Niell[1] model (NMF) has been noticed somethere else[2]. Through theoretical analysis and comparisons between different mapping function models and numerical integrals along track path by radiosonde observation data, the advanages and disadvantages of NMF model were investigaed in detail, in this paper. The errors of the height correction formulas of station in NMF model was reviewd and analyzed. As the conclusion, we think, the way of constructing mapping functions by radiosonde data was reasonable consideration in some conditions, for instance a stational or local mapping function. But there were still great difficulties to describe a 'global' mapping function of atmospheric refrctive delay even a large number of radiosonde data were available.
出处
《中国科学院上海天文台年刊》
1999年第20期61-70,共10页
Annals Shanghai Astronomical Observatory Chinese Academy of Sciences
基金
中国科学院射电天文联合实验室资助
广东省自然科学基金!960656
980927
