摘要
结合引力梯度不变量算法,采用球谐分析方法讨论极区空白对引力场恢复的影响。首先推导空白区对位系数恢复的影响公式,然后通过模拟计算分析空白区的影响量级和特点。结果表明,由于正交性遭到破坏,各阶之间会相互影响,特别是对低次的影响比较显著;采用"移去恢复法"可削弱极地空白带来的精度损失,但不同的先验模型会使得最终的解有差异;但在远离两极的区域,大地水准面的精度主要受观测值的精度所控制。
The influence of polar gaps on gravity field recovery from GOCE data is discussed with spherical harmonic analysis by combining the algorithms of invariants. Firstly the formulas to show the influence of polar gaps on recovery of the gravity field are derived, And then some simulations are given in order to analyze the magnitude and prosperity of the influence, The results show that different degrees will influence each other due to the destruction of orthogonality, especially on low orders. In order to reduce the influence of the polar gap, the method of remove-restore is introduced, Although the different results can be led by using the different reference models to remove-restore, the accuracy of the geoid in the region far from the polar gap is still mainly dominated by the accuracy of observation.
出处
《测绘学报》
EI
CSCD
北大核心
2013年第3期317-322,共6页
Acta Geodaetica et Cartographica Sinica
基金
国家自然科学基金(41074015
41104047)
中国科学院资源环境科学与技术局专项(XMXX280730)
武汉大学地球空间环境与大地测量教育部重点实验室开放基金(11-01-07)
