{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,10]],"date-time":"2026-03-10T14:34:37Z","timestamp":1773153277844,"version":"3.50.1"},"reference-count":21,"publisher":"Emerald","issue":"1\/2","license":[{"start":{"date-parts":[[2011,3,15]],"date-time":"2011-03-15T00:00:00Z","timestamp":1300147200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.emerald.com\/insight\/site-policies"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2011,3,15]]},"abstract":"<jats:sec><jats:title content-type=\"abstract-heading\">Purpose<\/jats:title><jats:p>The purpose of this paper is to consider the process of design and implementation of an enhanced fuzzy H<jats:sub>\u221e<\/jats:sub> (EFH<jats:sub>\u221e<\/jats:sub>) estimation algorithm to determine the attitude and heading angles of ground vehicles, which are frequently affected by considerable exogenous disturbances. To detect the changes of disturbances, a fuzzy system is designed based on expert knowledge and experiences of a navigation engineer. In the EFH<jats:sub>\u221e<\/jats:sub> estimator, the intensity bounds of disturbances affecting the measurements are updated using a heuristic combination of three change\u2010detection indices. Performance of the proposed estimator is evaluated by Monte\u2010Carlo simulations and field tests of three kinds of vehicles using a manufactured attitude\u2010heading reference system (AHRS). In both simulations and real tests, the proposed estimator results in a superior performance compared to those of the recently developed and standard H<jats:sub>\u221e<\/jats:sub> estimators.<\/jats:p><\/jats:sec><jats:sec><jats:title content-type=\"abstract-heading\">Design\/methodology\/approach<\/jats:title><jats:p>Design, implementation and real tests of the EFH<jats:sub>\u221e<\/jats:sub> estimator are considered for an AHRS specialized for vehicular applications. In the AHRS, three\u2010axis accelerometers (TAA) and three\u2010axis magnetometers (TAM) may be affected by large disturbances due to non\u2010gravitational accelerations and local magnetic fields. Therefore, the design parameters of EFH<jats:sub>\u221e<\/jats:sub> estimator including the theoretic bound of disturbance intensity and the attenuation level are adaptively tuned using a fuzzy combination of three change\u2010detection indices. Once a sensor is affected by an exogenous disturbance, the fuzzy system will increase the scale factor of the corresponding measurement disturbance to place more confidence on the data of the AHRS dynamics including measurements of gyros with respect to the data coming from the TAA and TAM.<\/jats:p><\/jats:sec><jats:sec><jats:title content-type=\"abstract-heading\">Findings<\/jats:title><jats:p>An intelligent fault detector is proposed for considering changes of disturbances to adjust the upper bounds of the estimator's disturbances and the length of data to update the fuzzy system inputs. The EFH<jats:sub>\u221e<\/jats:sub> estimator is suitable to attenuate the effects of disturbances changes on accurate estimation of the attitude and heading angles, intelligently.<\/jats:p><\/jats:sec><jats:sec><jats:title content-type=\"abstract-heading\">Originality\/value<\/jats:title><jats:p>The paper provides a fuzzy state estimator for adaptively adjusting the theoretic disturbance matrices according to the actual intensity of the disturbances affecting the AHRS dynamics and the measurement sensors.<\/jats:p><\/jats:sec>","DOI":"10.1108\/03684921111118068","type":"journal-article","created":{"date-parts":[[2011,5,21]],"date-time":"2011-05-21T08:12:41Z","timestamp":1305965561000},"page":"300-326","source":"Crossref","is-referenced-by-count":10,"title":["An enhanced fuzzy H<sub>\u221e<\/sub> estimator applied to low\u2010cost attitude\u2010heading reference system"],"prefix":"10.1108","volume":"40","author":[{"given":"Jafar","family":"Keighobadi","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mohammad\u2010Javad","family":"Yazdanpanah","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mansour","family":"Kabganian","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"140","reference":[{"key":"key2022031720471251100_b1","unstructured":"Basseville, M. and Nikiforov, I. 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