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中文摘要：
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。
英文摘要：
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.
同期刊论文项目
同项目期刊论文
Derivation of the radial gradient of the gravity based on non-full tensor satellite gravity gradient
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