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7 lines
404 B
Text
7 lines
404 B
Text
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Simplified perturbations models are a set of five mathematical models
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(SGP, SGP4, SDP4, SGP8 and SDP8) used to calculate orbital state
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vectors of satellites and space debris relative to the Earth-centered
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inertial coordinate system. This set of models is often referred to
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collectively as SGP4 due to the frequency of use of that model
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particularly with two-line element sets produced by NORAD and NASA.
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