However, as the large quantity of data makes the computational cost of this process prohibitive, an alternative method is to utilize GOCE gravity gradient data to improve existing gravity field models that have been derived from other kinds of observations.
The control concepts developed by Herther, Malcomson, and Covinginton during their internships at Doc's Instrumentation Lab would eventually become the foundation for the ascent guidance and three-axis passive gravity gradient on--orbit stabilization used on the Lockheed Agena spacecraft that carried CORONA's photographic capsule.
The gravity gradient disturbance is [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII], where [micro] is the gravitational parameter of the Earth, a is the semimajor axis of the orbit, and [C.sub.k] is the direction cosine matrix in terms of quaternions.
the anomaly or the gravity residual as it is called, between the Newtonian prediction and the measured below-earth gravity gradient. Taking the difference between (12) and (14), assuming the same unknown value of [G.sub.N] in both, we obtain an expression for the gravity residual