Main Core Libraries

OBSERVATION MODELS

Routines for the computation of observations obtained with the most common measurements techniques, optical and radar, at different levels of accuracy.
In order to reach the highest levels of accuracy, relativistic effects have to be considered, such as the deflection of the light path, known as Shapiro effect.

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NUMERICAL PROPAGATOR

Accurate and efficient multistep propagator/interpolator with regularisation techniques to manage the passage between different orbital regimes.
Regularisation techniques allow to reduce the error by a factor of the order of 10.D+3 or more. The regularisations which provide best results are Kustanheeimo- Stiefel (KS) and Burdet- Ferrandiz (BD). In particular, extreme cases with eccentricities above 0.9 can be treated without loss of accuracy.

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DYNAMICAL MODELS

Routines for the computation of the right hand side of the equation of motion of a generic object moving in the Solar System.
Planetary, relativistic and non gravitational perturbations are considered.

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GENERAL COORDINATE CHANGER

Routines for the Newtonian and relativistic conversion between different types of coordinates and reference systems.

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LEAST SQUARES SOLVER

Robust and fast differential corrector able to solve least squares problems with a very large number of parameters and to treat properly bad conditioned problems.

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