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Electron backscatter diffraction (EBSD) is a technique used to measurecrystallographic features in the scanning electron microscope. The technique ishighly automated and readily accessible in many laboratories. EBSD patternindexing is conventionally performed with raw electron backscatter patterns(EBSPs). These patterns are software processed to locate the band centres (andsometimes edges) from which the crystallographic index of each band isdetermined. Once a consistent index for many bands are obtained, the crystalorientation with respect to a reference sample & detector orientation can bedetermined and presented. Unfortunately, due to challenges related to crystalsymmetry, there are limited available pattern indexing approaches and this haslikely hampered open development of the technique. In this manuscript, wepresent a new method of pattern indexing, based upon a method with whichsatellites locate themselves in the night sky, and systematically demonstrateits effectiveness using dynamical simulations and real experimental patterns.The benefit of releasing this new algorithm is demonstrated as we utilise thisindexing process, together with dynamical solutions, to provide some of thefirst accuracy assessments of an indexing solution. In disclosing a newindexing algorithm, and software processing tool-kit, we hope this opens upEBSD developments to more users. The software code and example data is releasedalongside this article for 3rd party developments.

AstroEBSD: exploring new space in pattern indexing with methods launched from an astronomical approach