Gravity gradient is the second order derivative of gravitational potential, which can be observed by satellite gradiometer.
重力梯度为重力位的二阶导数，可以通过星载梯度仪进行观测。
The Second vertical derivative of the potential field is obtained from Lapace's equation.
位场垂向二次导数是基于拉氏方程求得的。
The Second vertical derivative of the potential field is obtained from Lapace's equation.
位场垂向二次导数是基于拉氏方程求得的。
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