摘要
当对近地卫星进行定轨时，将不可避免地遇到选取大气模型的问题，这些模型包括指数模型（ＥＸＰＴ）、ＤＴＭ、ＣＩＲＡ８６和Ｊ７７等模型。而Ｊ７７是较后形成的模型，它在大气阻力的研究中往往备受关注。这里，作者将涉及如何解决在ＶＡＸ３８００计算机上用Ｊ７７大气模型来处理Ａｊｉｓａｉ卫星资料时所遇到的计算发散问题，分析计算结果后，发现定轨软件ＳＨＯＲＤＥ中参数的选取不当是造成计算发散的根本原因，同时，我们给出了该参数的建议值为１０－１２。最后，将Ｊ７７的结果与其它模型的结果相比较，表明参数的调整是有效的。
おhen someone makes research on near-Earth satellite orbit determination,it is inevitable that one should use one of the atmospheric models,such as exponential atmospheric model (EXPT hereafter),DTM,CIRA86,J77,and so forth.As a comparatively later established atmospheric model,J77 seems so conspicous that it is usually taken into consideration as far as air drag perturbation is concerned.Here,the author is involved in a puzzle of calculation divergence resulting from introduction of J77 as an atmospheric model to deal with the precise orbit determinaton of the near-Earth satellite Ajisai when a computer operating system at the micro-VAX3800 is utilized.Based on many simulating calculations and postanalyses,the author has inferred that calculation divergence may be brought about by improperly adopting a default value of parameter ε in our software SHORDE for research on satellite orbit determination. The calculation shows that this parameter is dependent on,but not just equal to,the significant value of a specific computer operating system.After adjusting the parameter ε,the author recalculates the orbital elements and find out the results convergent.Finally the author compares the results with that produced by other atmospheric models,and the comparison indicates that the adjustment of parameter ε is rational.
出处
《云南天文台台刊》
CSCD
1998年第2期45-49,共5页
Publications of the Yunnan Observatoty
