Abstract
Based on the measurement principles of Satellite-to-Satellite Tracking (SST) mission, the new and effective observation equations of two satellites and three satellites are set up using energy conservation principle respectively. The high-accuracy Earth's gravitational field up to degree and order 120 is recovered by numerical simulation applying an improved pre-conditioned conjugate-gradient (PCCG) iterative approach. The simulated results show that the accuracy of the Earth's gravitational field recovery using two satellites is close to the results of EIGEN-GRACE02S publicized by Jet Propulsion Laboratory (JPL) in America, and the accuracy of the Earth's gravitational field recovery using three satellites is some times higher than that using two satellites.
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