But what likelihood is in that? William Shakespeare (15642–1616) Measure for Measure, Act IV, scene ii
Abstract
The TRIAD algorithm is shown to be derivable as a maximum-likelihood estimator. In particular, using the QUEST measurement model, the TRIAD attitude error covariance matrix can be derived as the inverse of the Fisher information matrix. The treatment here gives a microscopic analysis of the algorithm and its connection to the QUEST algorithm. It also sheds valuable light on the origin of discrete degeneracies in deterministic attitude estimation.
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Shuster, M.D. The TRIAD algorithm as maximum likelihood estimation. J of Astronaut Sci 54, 113–123 (2006). https://doi.org/10.1007/BF03256479
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DOI: https://doi.org/10.1007/BF03256479