A high-resolution pointing system for fast scanning platforms: The EBEX example

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dc.contributor.authorDidier, Joy
dc.contributor.authorChapman, Daniel
dc.contributor.authorAboobaker, Asad M.
dc.contributor.authorAraujo, Derek
dc.contributor.authorGrainger, Will
dc.contributor.authorHanany, Shaul
dc.contributor.authorHelson, Kyle
dc.contributor.authorHillbrand, Seth
dc.contributor.authorKorotkov, Andrei
dc.contributor.authorLimon, Michele
dc.contributor.authorMiller, Amber
dc.contributor.authorReichborn-Kjennerud, Britt
dc.contributor.authorSagiv, Ilan
dc.contributor.authorTucker, Greg
dc.contributor.authorVinokurov, Yuri
dc.date.accessioned2022-06-24T20:20:03Z
dc.date.available2022-06-24T20:20:03Z
dc.date.issued2015-06-08
dc.description2015 IEEE Aerospace Conference, Big Sky, MT, USAen_US
dc.description.abstractThe E and B experiment (EBEX) is a balloon-borne telescope designed to measure the polarization of the cosmic microwave background with 8' resolution employing a gondola scanning with speeds of order degree per second. In January 2013, EBEX completed 11 days of observations in a flight over Antarctica covering ~6000 square degrees of the sky. The payload is equipped with two redundant star cameras and two sets of three orthogonal gyroscopes to reconstruct the telescope attitude. The EBEX science goals require the pointing to be reconstructed to approximately 10" in the map domain, and in-flight attitude control requires the real time pointing to be accurate to ~0.5°. The high velocity scan strategy of EBEX coupled to its float altitude only permits the star cameras to take images at scan turnarounds, every ~40 seconds, and thus requires the development of a pointing system with low noise gyroscopes and carefully controlled systematic errors. Here we report on the design of the pointing system and on a simulation pipeline developed to understand and minimize the effects of systematic errors. The performance of the system is evaluated using the 2012/2013 flight data, and we show that we achieve a pointing error with RMS=25" on 40 seconds azimuth throws, corresponding to an error of ~4.6" in the map domain.en_US
dc.description.sponsorshipEBEX is a NASA supported mission through grant numbers NNX08AG40G and NNX07AP36H. We thank Columbia Scientific Balloon Facility for their enthusiastic support of EBEX, and the BLAST team for sharing their ACS system and knowledge. We also acknowledge support from NSF, CNRS, Minnesota Super Computing Institute, Minnesota and Rhode Island Space Grant Consortia, the Science and Technology Facilities Council in the UK, Sigma Xi, private donations, and funding from collaborating institutions. This research used resources of the National Energy Research Scientific Computing Center, which is supported by the office of Science of the U.S. Department of Energy under contract No. DE-AC02-05CH11231. The McGill authors acknowledge funding from the Canadian Space Agency, Natural Sciences and Engineering Research Council, Canadian Institute for Advanced Research, Canadian Foundation for Innovation and Canada Research Chairs program. Some of the results in this paper have been derived using the HEALPix package.en_US
dc.description.urihttps://ieeexplore.ieee.org/document/7119010en_US
dc.format.extent15 pagesen_US
dc.genreConference papers and proceedingsen_US
dc.identifierdoi:10.13016/m2mjc8-stin
dc.identifier.citationJ. Didier et al., "A high-resolution pointing system for fast scanning platforms: The EBEX example," 2015 IEEE Aerospace Conference, 2015, pp. 1-15, doi: 10.1109/AERO.2015.7119010.en_US
dc.identifier.urihttps://doi.org/10.1109/AERO.2015.7119010
dc.identifier.urihttp://hdl.handle.net/11603/25044
dc.language.isoen_USen_US
dc.publisherIEEEen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Center for Space Sciences and Technology
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.en_US
dc.rightsPublic Domain Mark 1.0*
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleA high-resolution pointing system for fast scanning platforms: The EBEX exampleen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0001-9238-4918en_US

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