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In general, LADRC has diversified structural forms due to different order and parameters selection. To clarify the prerequisites for constructing the LADRC strategy, a Laguerre-based LADRC (LLADRC) method is proposed, which provides controller design guidance for systems with unknown models by capturing the impulse response. Then, intensive attention is focused on establishing internal stability conditions of the feedback system and parameter tuning rules of the prescribed controller. To gain a better understanding, the internal correlation between LLADRC and standard LADRC of the same order is analyzed. It is shown that observer and controller gains of the standard LADRC can be tuned via a workable LLADRC to achieve better control performance. Finally, a numerical example and an application design of DC motor speed control are studied, both of which demonstrate the feasibility and validity of the proposed method.<\/jats:p>","DOI":"10.1177\/01423312241274602","type":"journal-article","created":{"date-parts":[[2024,10,26]],"date-time":"2024-10-26T03:40:58Z","timestamp":1729914058000},"page":"3190-3202","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Design of active disturbance rejection controller for the system with unknown model using Laguerre functions"],"prefix":"10.1177","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-6885-979X","authenticated-orcid":false,"given":"Pengcheng","family":"Zhang","sequence":"first","affiliation":[{"name":"School of Automation, Nanjing University of Science &amp; Technology, China"},{"name":"School of Electronic and Electrical Engineering, Kyungpook National University, South Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jianyu","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Automation, Nanjing University of Science &amp; Technology, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8252-952X","authenticated-orcid":false,"given":"Sangmoon","family":"Lee","sequence":"additional","affiliation":[{"name":"School of Electronic and Electrical Engineering, Kyungpook National University, South Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8042-8327","authenticated-orcid":false,"given":"Yun","family":"Cheng","sequence":"additional","affiliation":[{"name":"School of Electrical Engineering, Nantong University, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2024,10,26]]},"reference":[{"key":"e_1_3_2_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.isatra.2016.11.017"},{"key":"e_1_3_2_3_1","doi-asserted-by":"publisher","DOI":"10.1109\/TIE.2020.3016258"},{"key":"e_1_3_2_4_1","doi-asserted-by":"publisher","DOI":"10.1109\/TIA.2018.2855128"},{"key":"e_1_3_2_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ifacol.2020.12.1256"},{"key":"e_1_3_2_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.isatra.2021.02.020"},{"key":"e_1_3_2_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.isatra.2017.12.005"},{"key":"e_1_3_2_8_1","doi-asserted-by":"publisher","DOI":"10.1177\/0142331220908989"},{"key":"e_1_3_2_9_1","doi-asserted-by":"publisher","DOI":"10.1109\/ACCESS.2020.3028459"},{"key":"e_1_3_2_10_1","volume-title":"Feedback Control Theory","author":"Doyle JC","year":"1990","unstructured":"Doyle JC, Francis BA, Tannenbaum AR (1990) Feedback Control Theory. 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