摘要
针对利用重力场模型方法计算地球外空间扰动引力的精度时,模型截断误差是主要的影响因素这一问题,该文利用重力场模型阶方差分析地球外部空间扰动引力截断误差,并与用重力异常阶方差Rapp模型进行比较。实验结果表明:在低阶低空部分,Rapp模型与实际重力异常阶方差相差最大,达到17.125 3mGal;重力场模型计算扰动引力与计算点高度有着密切联系,截断误差的大小随着高度的增加迅速衰减;当计算高度为0.2km时,使用36阶的模型计算扰动引力,截断误差达到25.957 8mGal;当计算高度超过400km时,即使用36阶模型,截断误差也可以控制在1.5mGal内。
When the accuracy of the gravity field disturbance is analyzed,the truncation error is the main factor which should be considered.In this paper,degree variance of the gravity field model was used to analyze the gravity truncation error of the earth outer space perturbation,and compared with the gravity anomaly degree variance of model Rapp.Experimental results showed that the maximum of two results was17.1253mGal;when in 0.2km,the effect of 36 order model truncation error could reach 25.9578mGal;when the height was more than 400 km,and using 36 order model,the effect of truncation error was less than 1.5mGal.
出处
《测绘科学》
CSCD
北大核心
2015年第12期31-33,49,共4页
Science of Surveying and Mapping
基金
国防973项目(6132220202-2)
63880部队博士后基金项目
关键词
扰动引力
地球重力场模型
阶方差模型
Rapp模型
截断误差
disturbing gravity
earth gravity model
degree variance of the gravity anomaly
Rapp model
truncation error
