{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,1]],"date-time":"2025-11-01T02:43:57Z","timestamp":1761965037275,"version":"build-2065373602"},"reference-count":21,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2018,9,10]],"date-time":"2018-09-10T00:00:00Z","timestamp":1536537600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>An engineering validation of a large optical telescope consists of executing major performing tests at the subsystem level to verify the overall engineering performance of the observatory. Thus, the relative pointing error verification of the telescope mount assembly subsystem is of special interest to guarantee the absolute pointing performance of the large synoptic survey telescope. This paper presents a new verification method for the relative pointing error assessment of the telescope mount assembly, based on laser tracker technology and several fiducial points fixed to the floor. Monte-Carlo-based simulation results show that the presented methodology is fit for purpose, even if floor movement occurs due to temperature variation during the measurement acquisition process. A further research about laser tracker technology integration into the telescope structure may suggest that such laser tracker technology could be permanently installed in the telescope in order to provide an active alignment system that aims to detect and correct possible misalignment between mirrors or to provide the required mirror positioning verification accuracy after maintenance activities. The obtained results show that two on-board laser tracker systems combined with eight measurement targets could result in measurement uncertainties that are better than 1 arcsec, which would provide a reliable built-in metrology tool for large telescopes.<\/jats:p>","DOI":"10.3390\/s18093023","type":"journal-article","created":{"date-parts":[[2018,9,10]],"date-time":"2018-09-10T10:28:57Z","timestamp":1536575337000},"page":"3023","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["3D Measurement Simulation and Relative Pointing Error Verification of the Telescope Mount Assembly Subsystem for the Large Synoptic Survey Telescope"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4157-5666","authenticated-orcid":false,"given":"Unai","family":"Mutilba","sequence":"first","affiliation":[{"name":"Department of Mechanical Engineering, IK4-Tekniker, 20600 Eibar, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gorka","family":"Kortaberria","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, IK4-Tekniker, 20600 Eibar, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fernando","family":"Ega\u00f1a","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, IK4-Tekniker, 20600 Eibar, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7152-4117","authenticated-orcid":false,"given":"Jose Antonio","family":"Yag\u00fce-Fabra","sequence":"additional","affiliation":[{"name":"I3A, University of Zaragoza, 50018 Zaragoza, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2018,9,10]]},"reference":[{"key":"ref_1","unstructured":"Callahan, S., Gressler, W., Thomas, S.J., Gessner, C., Warner, M., Lotz, P.J., Schumacher, G., Wiecha, O., Angeli, G., and Andrew, J. (July, January 26). Large Synoptic Survey Telescope mount final design. Proceedings of the SPIE Astronomical Telescopes + Instrumentation, Edinburgh, UK."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Mutilba, U., Kortaberria, G., Ega\u00f1a, F., and Yag\u00fce-Fabra, J.A. (2018, January 20\u201322). Relative pointing error verification of the Telescope Mount Assembly subsystem for the Large Synoptic Survey Telescope. Proceedings of the IEEE International Workshop on Metrology for AeroSpace, Rome, Italy.","DOI":"10.1109\/MetroAeroSpace.2018.8453570"},{"key":"ref_3","unstructured":"Wallace, P.T. (2018, July 10). Telescope Pointing. Available online: http:\/\/www.tpointsw.uk\/pointing.htm."},{"key":"ref_4","unstructured":"Elfving, A., and Bagnasco, G. (1999). The Pointing and Alignment of XMM, ESTEC."},{"key":"ref_5","unstructured":"Neill, D., Sebag, J., Gressler, W., Warner, M., and Wiecha, O. (2016). LTS-103 Telescope Mount Assembly (TMA) Specifications, LSST."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"105","DOI":"10.1016\/j.newast.2016.02.007","article-title":"Modeling and calibration of pointing errors with alt-az telescope","volume":"47","author":"Huang","year":"2016","journal-title":"New Astron."},{"key":"ref_7","unstructured":"Vaksdal, B. (2016). Pointing Calibration for Medium Size Telescopes in the Cherenkov Telescope Array. [Master\u2019s Thesis, KTH Engineering Sciences]."},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Cheng, J. (2009). The Principles of Astronomical Telescope Design, Springer.","DOI":"10.1007\/b105475"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"216","DOI":"10.1016\/j.astropartphys.2007.05.008","article-title":"Using stars to determine the absolute pointing of the fluorescence detector telescopes of the Pierre Auger Observatory","volume":"28","author":"Prouza","year":"2007","journal-title":"Astropart. Phys."},{"key":"ref_10","first-page":"1","article-title":"Development of High-Accuracy Pointing Verification for ALMA Antenna","volume":"9145","author":"Matsuzawa","year":"2014","journal-title":"Proc. SPIE"},{"key":"ref_11","unstructured":"Gallagher, B.B. (2003). Optical Shop Applications for Laser Tracker Metrology Systems. [Master\u2019s Thesis, The University of Arizona]."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"66760E","DOI":"10.1117\/12.736705","article-title":"Use of a commercial laser tracker for optical alignment","volume":"6676","author":"Burge","year":"2007","journal-title":"Proc. SPIE"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"844454","DOI":"10.1117\/12.928706","article-title":"Using a laser tracker for active alignment on the Large Binocular Telescope","volume":"8444","author":"Rakich","year":"2012","journal-title":"Proc. SPIE"},{"key":"ref_14","first-page":"91454A","article-title":"LSST telescope integration and tests","volume":"9145","author":"Sebag","year":"2014","journal-title":"Proc. SPIE"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"990614","DOI":"10.1117\/12.2234301","article-title":"A 3D metrology system for the GMT","volume":"9906","author":"Rakich","year":"2016","journal-title":"Proc. SPIE"},{"key":"ref_16","unstructured":"Gressler, W.J., and Sandwith, S. (2006, January 3\u20134). Active Alignment System for the LSST. Proceedings of the Columbia Music Scholarship Conference (CMSC), Orlando, FL, USA."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Schmitt, R., Peterek, M., Morse, E., Knapp, W., Galetto, M., H\u00e4rtig, F., Goch, G., Hughes, B., Forbes, A., and Estler, W. (2016). Advances in Large-Scale Metrology\u2014Review and future trends. CIRP Ann. Manuf. Technol.","DOI":"10.1016\/j.cirp.2016.05.002"},{"key":"ref_18","unstructured":"Calkins, J.M. (2002). Quantifying Coordinate Uncertainty Fields in Coupled Spatial Measurement Systems. [Ph.D. Thesis, Virginia Tech]."},{"key":"ref_19","unstructured":"Bindel, D., and Goodman, J. (2018, July 10). Principles of Scientific Computing Monte Carlo Methods; 2009. Available online: https:\/\/pdfs.semanticscholar.org\/9a43\/1e7cf68338652b2cbf5aabc3ae88f0949130.pdf."},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Muelaner, J.E., Wang, Z., Jamshidi, J., and Maropoulos, P.G. (2009, January 14\u201316). Verification of the indoor GPS system by comparison with points calibrated using a network of laser tracker measurements. Proceedings of the 6th CIRP-Sponsored International Conference on Digital Enterprise Technology, Hongkong, China.","DOI":"10.1007\/978-3-642-10430-5_47"},{"key":"ref_21","unstructured":"Joint Committee for Guides in Metrology (2018, July 10). JCGM 100:2008\u2014Evaluation of Measurement Data\u2014Guide to the Expression of Uncertainty in Measurement; JCGM: 2008. Available online: https:\/\/www.bipm.org\/utils\/common\/documents\/jcgm\/JCGM_100_2008_E.pdf."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/18\/9\/3023\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T15:19:41Z","timestamp":1760195981000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/18\/9\/3023"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2018,9,10]]},"references-count":21,"journal-issue":{"issue":"9","published-online":{"date-parts":[[2018,9]]}},"alternative-id":["s18093023"],"URL":"https:\/\/doi.org\/10.3390\/s18093023","relation":{},"ISSN":["1424-8220"],"issn-type":[{"type":"electronic","value":"1424-8220"}],"subject":[],"published":{"date-parts":[[2018,9,10]]}}}