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\title{Analytical Partial Derivatives of Observation Matrix}
\author{M.P. Pinheiro}
\date{}

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\maketitle

Analytical expressions are  obtained for the partial derivatives of a set of
observations with respect to a given state vector. Such equations are often
needed in orbit determinations methods. The equations presented in this paper can
be applied to low and high satellite orbits. Position, velocity, thruster and
solar radiation force are the components of the state vector. The observation
vector is composed by azimuth, elevation, range, azimuth and elevation biases.
From the orbit determination accuracy point of view, the biases may not be
considered for geostationary orbits; however they are important during transfer
phase and for low orbit satellites

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