Abstract
COSMIC:Geodetic Applications in Improving Earth's Gravity Model
Highlights
COSMIC (Constellation Observing System for Meteorology, Ionosphere and Climate) is a scientific space mission jointly planned by the National Space Program Office of Taiwan, the Republic of China, and the National Science Foundation of the United States
The simulation results that we describe fall in two categories: results from simpli fied analytical evaluations of various configurations; and more elaborate, dynamic solutions using the same software and models that are used for real data analysis, approximating reality as much as it is feasible
Analytical simulations with simplified assumptions can be very useful to the mission design team in evaluating the various options and mission scenarios (Pavlis et al, 1996)
Summary
COSMIC (Constellation Observing System for Meteorology, Ionosphere and Climate) is a scientific space mission jointly planned by the National Space Program Office of Taiwan, the Republic of China, and the National Science Foundation of the United States. The gravity satellite missions CHAMP and GRACE, for the first time, will be equipped with a three-axis vector accelerometer for this purpose Falling short of such active means but taking advantage of the fact that satellites flying in tandem experience similar non-gravitational forces, COSMIC will use yet another scheme of reducing the influence of such forces, namely the common-mode cancellation (see Section 2 below). Large softwares have been developed over the years that carry out this solution, such as the GEODYN program (see below) developed at NASA's Goddard Space Flight Center Such effort has led to a series of global gravity models, a most recent example being EGM96 (Lemoine et al, 1998), a spherical harmonic expansion complete to degree and order 360 which correspond to a spatial resolution of about 50 km.
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