{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,16]],"date-time":"2025-12-16T12:12:42Z","timestamp":1765887162132,"version":"build-2065373602"},"reference-count":20,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2009,9,30]],"date-time":"2009-09-30T00:00:00Z","timestamp":1254268800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>A novel on-axis general sun-tracking formula has been integrated in the algorithm of an open-loop sun-tracking system in order to track the sun accurately and cost effectively. Sun-tracking errors due to installation defects of the 25 m2 prototype solar concentrator have been analyzed from recorded solar images with the use of a CCD camera. With the recorded data, misaligned angles from ideal azimuth-elevation axes have been determined and corrected by a straightforward changing of the parameters\u2019 values in the general formula of the tracking algorithm to improve the tracking accuracy to 2.99 mrad, which falls below the encoder resolution limit of 4.13 mrad.<\/jats:p>","DOI":"10.3390\/s91007849","type":"journal-article","created":{"date-parts":[[2009,9,30]],"date-time":"2009-09-30T13:09:17Z","timestamp":1254316157000},"page":"7849-7865","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":60,"title":["Integration of an On-Axis General Sun-Tracking Formula in the Algorithm of an Open-Loop Sun-Tracking System"],"prefix":"10.3390","volume":"9","author":[{"given":"Kok-Keong","family":"Chong","sequence":"first","affiliation":[{"name":"Faculty of Engineering and Science, Universiti Tunku Abdul Rahman,Off Jalan Genting Kelang, Setapak, 53300 Kuala Lumpur, Malaysia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chee-Woon","family":"Wong","sequence":"additional","affiliation":[{"name":"Faculty of Engineering and Science, Universiti Tunku Abdul Rahman,Off Jalan Genting Kelang, Setapak, 53300 Kuala Lumpur, Malaysia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fei-Lu","family":"Siaw","sequence":"additional","affiliation":[{"name":"Faculty of Engineering and Science, Universiti Tunku Abdul Rahman,Off Jalan Genting Kelang, Setapak, 53300 Kuala Lumpur, Malaysia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tiong-Keat","family":"Yew","sequence":"additional","affiliation":[{"name":"Faculty of Engineering and Science, Universiti Tunku Abdul Rahman,Off Jalan Genting Kelang, Setapak, 53300 Kuala Lumpur, Malaysia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"See-Seng","family":"Ng","sequence":"additional","affiliation":[{"name":"Faculty of Engineering and Science, Universiti Tunku Abdul Rahman,Off Jalan Genting Kelang, Setapak, 53300 Kuala Lumpur, Malaysia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Meng-Suan","family":"Liang","sequence":"additional","affiliation":[{"name":"Faculty of Engineering and Science, Universiti Tunku Abdul Rahman,Off Jalan Genting Kelang, Setapak, 53300 Kuala Lumpur, Malaysia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yun-Seng","family":"Lim","sequence":"additional","affiliation":[{"name":"Faculty of Engineering and Science, Universiti Tunku Abdul Rahman,Off Jalan Genting Kelang, Setapak, 53300 Kuala Lumpur, Malaysia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sing-Liong","family":"Lau","sequence":"additional","affiliation":[{"name":"Faculty of Engineering and Science, Universiti Tunku Abdul Rahman,Off Jalan Genting Kelang, Setapak, 53300 Kuala Lumpur, Malaysia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2009,9,30]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Luque, A.L., and Andreev, V.M. 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Technol."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1931","DOI":"10.1016\/j.enconman.2003.10.007","article-title":"Two axes sun tracking system with PLC control","volume":"45","author":"Abdallah","year":"2004","journal-title":"Energy Conver. Manage."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"156","DOI":"10.1115\/1.1824103","article-title":"The tracking of the sun for solar paraboloidal dish concentrators","volume":"127","author":"Shanmugam","year":"2005","journal-title":"J. Sol. Energy Eng."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"207","DOI":"10.1016\/S0960-1481(00)00191-9","article-title":"The realization of a simple solar tracking concentrator for the university research applications","volume":"24","author":"Nuwayhid","year":"2001","journal-title":"Renew. Energy"},{"key":"ref_15","unstructured":"Luque-Heredia, I., Gordillo, F., and Rodriguez, F. (2004, January June). 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