Chapter 4 – Fundamentals of Orbit Determination

Publisher Summary This chapter discusses the fundamentals of orbit determination. This improvement in orbit determination accuracy was motivated by the ever increasing demands of scientists in the oceanographic and geodetic communities. In particular, the need for centimeter-level accuracy in global ocean topography obtained from altimetric satellites spurred extensive and unprecedented model improvements during the past two decades. The chapter describes the role of the measurement model in introducing nonlinearity to the process. In the general orbit determination problem, both the dynamics and the measurements involve significant nonlinear relationships. It illustrates the role of the estimation process in improving the force and measurement models as an integral step in the process.

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