Transcription of Fundamental Concepts - NASA
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Fundamental Concepts - NASA
Navigation and Ancillary Information FacilityNIFF undamental ConceptsOctober 2022 Navigation and Ancillary Information FacilityNIFF undamental Concepts2 Preface Time Reference Frames Coordinate Systems Positions and States Aberration CorrectionsTopicsNavigation and Ancillary Information FacilityNIFF undamental Concepts3 Preface This tutorial introduces terminology and Concepts used in the later SPICE tutorials. Some of this material is more difficult than what follows in later presentations. A complete understanding of this material is notessential in order to use SPICE. Still, we think this information may be helpful, on we go!
Fundamental Concepts 12 •Spacecraft have onboard clocks to control scheduling of observations, maneuvers, attitude adjustments, etc. •Used to time stamp data •Fundamental unit of time is the “tick” –Smallest increment possible for a spacecraft clock –Nominal tick duration is spacecraft clock dependent
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