一种基于CGCS2000大地线确定新方法的探讨  

A new method for the geodesic on CGCS2000

作　　者：项伟[1,2] 白征东[1] 王园[3] 汤晓禹 

机构地区：[1]清华大学地球空间信息研究所 [2]空军工程设计研究局 [3]96633部队

出　　处：《工程勘察》2017年第3期59-63,共5页Geotechnical Investigation & Surveying

摘　　要：本文通过对WGS-84和CGCS2000进行对比,从理论上探讨了利用基于WGS-84大地线代替基于CGCS2000大地线的可能性,提出一种基于CGCS2000机场间相对关系确定的新方法。通过实例计算,在大地线长度从50~5500km的范围内,两种椭球上的大地线长度最大相差12.8cm,大地方位角最大相差0.04″。结果表明,该方法满足机场间相对关系确定的精度要求的同时,简化了工作步骤,有效地避免了计算过程中的各种误差,大大提高了工作效率。This paper theoretically discusses the probability that the WGS-84 geodetic replaces the CGCS2000 geodesic by the comparison of WGS-84 and CGCS2000,proposes a new method that gives the relative positions of airport bases on CGCS2000. Through computation of the example,the biggest difference is 12. 8cm and the maximum difference of the geodetic azimuth is 0. 04″,when length of the geodesic is from50 to 5589 km. And the result shows that the method satisfies the required accuracy for determining the position relationship between airports. Meanwhile,it also simplifies the working steps,avoids various errors during the calculation effectively,and can significantly improve the working efficiency.

关 键 词：机场 CGCS2000 WGS-84 大地线 IGS 精密星历 精密单点定位 

分 类 号：P226[天文地球—大地测量学与测量工程]