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The main goal of this study is decoupling disturbance and uncertainties from the true states for discrete fractional order systems in noisy environment. The fractional Kalman filter framework is exploited to develop a robust estimator against unknown inputs (UIs) in noisy environment. The proposed filter is exploited to detect faults in fractional order systems. Simulation results illustrate the advantages of this robust filter for state estimation and fault detection of fractional order model of ultra-capacitor (UC). The robustness of the designed filter is shown in the sense of disturbance decoupling in the presence of noise.<\/jats:p>","DOI":"10.1177\/0142331217746493","type":"journal-article","created":{"date-parts":[[2018,2,1]],"date-time":"2018-02-01T05:57:07Z","timestamp":1517464627000},"page":"4321-4329","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":13,"title":["Fractional order unknown input filter design for fault detection of discrete fractional order linear systems"],"prefix":"10.1177","volume":"40","author":[{"given":"Jafar","family":"Zarei","sequence":"first","affiliation":[{"name":"Control Engineering Department, School of Electrical and Electronics Engineering, Shiraz University of Technology, Iran"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mahmood","family":"Tabatabaei","sequence":"additional","affiliation":[{"name":"Control Engineering Department, School of Electrical and Electronics Engineering, Shiraz University of Technology, Iran"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2018,2,1]]},"reference":[{"key":"bibr1-0142331217746493","doi-asserted-by":"publisher","DOI":"10.1155\/2013\/829715"},{"key":"bibr2-0142331217746493","doi-asserted-by":"publisher","DOI":"10.1016\/j.nahs.2013.07.001"},{"key":"bibr3-0142331217746493","doi-asserted-by":"publisher","DOI":"10.1002\/asjc.765"},{"key":"bibr4-0142331217746493","doi-asserted-by":"publisher","DOI":"10.1016\/j.automatica.2009.02.031"},{"key":"bibr5-0142331217746493","doi-asserted-by":"publisher","DOI":"10.1109\/TAC.2009.2019800"},{"key":"bibr6-0142331217746493","doi-asserted-by":"publisher","DOI":"10.1016\/j.cnsns.2014.03.006"},{"key":"bibr7-0142331217746493","unstructured":"Bask M (2005) Dynamic threshold generators for robust fault detection. 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