The SGP4 model is one of the analytical orbit models
applied for the orbit prediction using TLE orbit
information. For the orbit accuracy improvement, a
model conversion was performed to apply a more
precise model. Assuming that a TLE data set is the best
possible fit to the observation data, the orbital arc in a
specified time span was reconstructed from several TLE
sets. Using osculating elements of the SGP4 output as
measurements data, the orbit determination as well as
the orbit propagation were performed with the
numerical orbit model. The performance of this process
was assessed by a comparison with precise orbit
information. After the inherent model accuracy analysis
using the best-fitted TLE based on GPS data, the
process was applied to the publically available TLE,
where an accuracy improvement was achieved for some
objects. The same process was also successfully applied
to re-entry prediction calculations. The more advanced
process needs to be studied for a general application
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