Triad method: Difference between revisions

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Triad is one of the earliest and simplest solutions to the spacecraft attitude determination problem,.<ref>{{cite journal|last=Black|first=Harold|title=A Passive System for Determining the Attitude of a Satellite|journal=AIAA Journal|month = July|year=1964|volume=2|issue=7|pages=1350–1351|doi=10.2514/3.2555}}</ref><ref>{{cite journal|last=Black|first=Harold|title=Early Developments of Transit, the Navy Navigation Satellite System|journal=Journal of Guidance, Control and Dynamics|year=1990|month=July-Aug|volume=13|issue=4|pages=577–585|doi=10.2514/3.25373}}</ref> As evident from the literature, TRIAD represents the state of practice in spacecraft attitude determination, well before the advent of the [[Wahba's problem]] <ref>{{cite journal|last=Wahba|first=Grace|title=A Least Squares Estimate of Satellite Attitude, Problem 65.1|journal=SIAM Review|year=1966|month=July|pages=385–386}}</ref> problem and its several optimal solutions. Given the knowledge of two vectors in the reference and body coordinates of a satellite, the TRIAD algorithm obtains the direction cosine matrix relating both frames.

==Summary==