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To solve the problem, a composite control scheme is proposed based on the combination of dynamic surface control and disturbance observer-based control techniques. The control design includes two parts. In the first part, some nonlinear disturbance observers are designed to accurately estimate the helicopter\u2019s disturbances in different channels. In the second part, based on the disturbance estimates and dynamic surface control technique, a composite dynamic surface tracking controller is designed. Under the proposed composite controller, the attitude and height tracking errors are uniformly ultimately bounded and they can be regulated to be very small by selecting proper controller parameters. For one thing, the proposed control scheme avoids \u201cexplosion of terms\u201d, which generally exists in conventional backstepping control and provides a simpler control design. For another thing, without sacrificing the nominal control performances, the anti-disturbance ability of the closed-loop helicopter system is enhanced by using disturbance observers and feedforward compensations. Numerical simulations demonstrate the effectiveness and advantages of the proposed composite tracking controller.<\/jats:p>","DOI":"10.1177\/01423312211023227","type":"journal-article","created":{"date-parts":[[2021,6,22]],"date-time":"2021-06-22T05:47:35Z","timestamp":1624340855000},"page":"3294-3307","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":5,"title":["Attitude and height tracking control of unmanned helicopters with disturbances via disturbance observer-based composite dynamic surface control"],"prefix":"10.1177","volume":"43","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8793-381X","authenticated-orcid":false,"given":"Xiangyu","family":"Wang","sequence":"first","affiliation":[{"name":"School of Automation, Southeast University, PR China"},{"name":"Key Laboratory of Measurement and Control of Complex Systems of Engineering, Ministry of Education, PR 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