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GOCE: THE EARTH GRAVITY FIELD BY SPACE GRADIOMETRY

机译:GOCE:通过地球重力法进行的地球重力场

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摘要

An artificial satellite, flying in a purely gravitational field is a natural probe, such that, by a very accurate orbit determination, would allow a perfect estimation of the field. A true satellite experiences a number of perturbational, non-gravitational forces acting on the shell of the spacecraft; these can be revealed and accurately measured by a spaceborne accelerometer. If more accelerometers are flown in the same satellite, they naturally eliminate (to some extent) the common perturbational accelerations and their differences are affected by the second derivatives of the gravity fields only (gradiometry). The mission GOCE is based on this principle. Its peculiar dynamical observation equations are reviewed. The possibility of estimating the gravity field up to some harmonic degree (~200) is illustrated.
机译:在纯重力场中飞行的人造卫星是自然的探测器,因此,通过非常精确的轨道确定,可以对场进行完美估计。一颗真正的卫星会承受作用在飞船外壳上的许多微扰非重力。这些可以通过星载加速度计显示并精确测量。如果在同一颗卫星上飞行了更多的加速度计,它们自然会(在某种程度上)消除共同的摄动加速度,并且它们的差异仅受重力场的二阶导数(梯度法)的影响。 GOCE的使命就是基于这一原则。回顾了其独特的动力学观测方程。举例说明了估计重力场直至一定谐波次数(〜200)的可能性。

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