Autonomous satellite orbit determination using spaceborne GNSS receivers
ABSTRACT The influence of outer space conditions on the navigation-processing algorithms has been analyzed. The main problems that
need to be solved by researchers in developing procedures for digital signal processing in onboard satellite navigation equipment
have been described. It has been shown that navigation accuracy depends on the quality of the models for satellite motion
and the onboard clock. It has been pro-posed that the stochastic “random walk” model based on the Kalman filter should be
used for clock modeling. It has been demonstrated that this model is much more efficient than the classical polynomial model
for GEO satellite navigation. Together with the precise satellite dynamic model, it allows three-dimensional accuracy on the
order of 30 m, even in the case when a standard temperature-compensated crystal oscillator is used.
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ABSTRACT: Up to this time, the VSOP (Variations Séculaires des Orbites Planètaires) analytical solutions of the motion of the planets were only represented in elliptic variables, but the cartesian or spherical variables are much more convenient in many problems: determination of the planetary perturbations of the Moon, analytical expressions for the computation of the apparent places, analytical expressions of nutation, of the difference TDB-TDT. From an analytical solution of the motion expressed with elliptic elements, the authors hence build different representations. The solutions are expressed with rectangular variables X, Y, Z or with spherical variables, longitude, latitude and radius vector. The different reference frames used are the dynamical ecliptic and equinox J2000.0, the ecliptic and equinox of date. The origin is the Sun or the barycenter of the solar system.Astronomy and Astrophysics 07/1988; 202:309-315. · 5.08 Impact Factor
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