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There are two common modes for target tracking: over-flight tracking and standoff tracking. Each tracking method has a wide application prospect. However, many researchers have studied these two tracking methods separately and designed different guidance laws, which is not conducive to practical application. In this paper, a new guidance law based on sliding mode guidance (SMG) is proposed for tracking a stationary target, which is compatible with the two tracking modes. The stability and finite-time convergence of the guidance law are proved. Then, the guidance is extended to tracking a moving target. The numerical simulations are carried out for the tracking problems of ground targets, and the results verify the effectiveness of the proposed guidance law.<\/jats:p>","DOI":"10.1177\/01423312211037618","type":"journal-article","created":{"date-parts":[[2021,8,18]],"date-time":"2021-08-18T07:20:58Z","timestamp":1629271258000},"page":"410-423","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":8,"title":["Over-flight and standoff tracking of a ground target with a fixed-wing unmanned aerial vehicle based on a unified sliding mode guidance law"],"prefix":"10.1177","volume":"44","author":[{"given":"Chuanjian","family":"Lin","sequence":"first","affiliation":[{"name":"School of Automation, Northwestern Polytechnical University, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5700-2638","authenticated-orcid":false,"given":"Jingping","family":"Shi","sequence":"additional","affiliation":[{"name":"School of Automation, Northwestern Polytechnical University, China"}]},{"given":"Yongxi","family":"Lyu","sequence":"additional","affiliation":[{"name":"School of Automation, Northwestern Polytechnical University, China"}]},{"given":"Yueping","family":"Wang","sequence":"additional","affiliation":[{"name":"Science and Technology on Aircraft Control Laboratory, FACRI, Aviation Industry Corporation of China, China"}]}],"member":"179","published-online":{"date-parts":[[2021,8,18]]},"reference":[{"key":"bibr1-01423312211037618","doi-asserted-by":"publisher","DOI":"10.1137\/S0363012997321358"},{"key":"bibr2-01423312211037618","doi-asserted-by":"publisher","DOI":"10.1109\/ACC.2014.6858806"},{"key":"bibr3-01423312211037618","doi-asserted-by":"publisher","DOI":"10.1016\/j.automatica.2015.03.007"},{"key":"bibr4-01423312211037618","doi-asserted-by":"publisher","DOI":"10.1117\/12.819836"},{"key":"bibr5-01423312211037618","doi-asserted-by":"publisher","DOI":"10.1109\/TAES.2013.6494384"},{"key":"bibr6-01423312211037618","doi-asserted-by":"publisher","DOI":"10.1177\/0142331219879338"},{"key":"bibr7-01423312211037618","doi-asserted-by":"publisher","DOI":"10.2514\/1.30507"},{"key":"bibr8-01423312211037618","doi-asserted-by":"publisher","DOI":"10.1016\/j.ast.2018.02.011"},{"key":"bibr9-01423312211037618","doi-asserted-by":"publisher","DOI":"10.1016\/j.ast.2018.10.017"},{"key":"bibr10-01423312211037618","doi-asserted-by":"publisher","DOI":"10.1007\/s10846-017-0483-z"},{"key":"bibr11-01423312211037618","doi-asserted-by":"publisher","DOI":"10.2514\/1.34896"},{"key":"bibr12-01423312211037618","doi-asserted-by":"publisher","DOI":"10.1109\/ITST.2015.7377394"},{"key":"bibr13-01423312211037618","doi-asserted-by":"publisher","DOI":"10.1177\/0142331215589807"},{"key":"bibr14-01423312211037618","unstructured":"Oh H (2013) Towards autonomous surveillance and tracking by multiple UAVs. 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