IERS　1996规范在参考系方面的改进  

Improvement of Reference System Field in the IERS 1996 Conventions

作　　者：夏一飞[1] 萧耐园[1] 

机构地区：[1]南京大学天文系,南京210093

出　　处：《天文学进展》1999年第2期104-112,共9页Progress In Astronomy

基　　金：国家自然科学基金!19673003;国家攀登项目!970231003

摘　　要：对IERS1996规范中有关参考系方面作了简单而系统的介绍，重点叙述了与IERS1992标准相比IERS1996规范在参考系方面的主要改进：天球参考架中的基本源从57颗增加到236颗；动力学参考架采用JPLDE403／LE403历表代替DE200／LE200历表；采用NUVELNNR-1A板块运动模型代替NUVELNNR－1模型；变更了9个基本常数值；给出了天极坐标的观测和理论间差的经验模型，即IERS1996岁差／章动理论；更改了VLBI时间延迟公式中总的引力势表达式，从而与SI秒的规定相一致。IERS1996规范还存在一定缺陷，需要进一步改进和提高。IERS 1996 Conventions define the current best standard reference system. The reference system field is briefly and systematically described, in comparison with IERS 1992 Standards, the major improvements made up with IERS 1996 Conventions are presented. The number of defining source in celestial reference frame increases from 57 to 236, the planetary and lunar ephemerides are the JPL DE403/LE403 instead of DE200/LE200, and the NUVEL NNR-1A Model for plate motion replaces the NUVEL NNR-1 Model, the numerical values of 9 fundamental constants are changed, an empirical model, the IERS 1996 theory of precession/nutation, to be used to predict the difference in the celestial pole coordinates between observation and theory is added,the expression of the total potential in the delay equation is modified to be consistent with the SI second. IERS 1996 Conventions still have some defects. It requires further improvement.

关 键 词：参考系 IERS 标准参考系统 天球参考架 

分 类 号：P183.31[天文地球—天文学]