{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,27]],"date-time":"2025-10-27T05:01:53Z","timestamp":1761541313703,"version":"build-2065373602"},"reference-count":21,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2016,4,22]],"date-time":"2016-04-22T00:00:00Z","timestamp":1461283200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>The aim of this study was to design a navigation system composed of a human-controlled leader vehicle and a follower vehicle. The follower vehicle automatically tracks the leader vehicle. With such a system, a human driver can control two vehicles efficiently in agricultural operations. The tracking system was developed for the leader and the follower vehicle, and control of the follower was performed using a camera vision system. A stable and accurate monocular vision-based sensing system was designed, consisting of a camera and rectangular markers. Noise in the data acquisition was reduced by using the least-squares method. A feedback control algorithm was used to allow the follower vehicle to track the trajectory of the leader vehicle. A proportional\u2013integral\u2013derivative (PID) controller was introduced to maintain the required distance between the leader and the follower vehicle. Field experiments were conducted to evaluate the sensing and tracking performances of the leader-follower system while the leader vehicle was driven at an average speed of 0.3 m\/s. In the case of linear trajectory tracking, the RMS errors were 6.5 cm, 8.9 cm and 16.4 cm for straight, turning and zigzag paths, respectively. Again, for parallel trajectory tracking, the root mean square (RMS) errors were found to be 7.1 cm, 14.6 cm and 14.0 cm for straight, turning and zigzag paths, respectively. The navigation performances indicated that the autonomous follower vehicle was able to follow the leader vehicle, and the tracking accuracy was found to be satisfactory. Therefore, the developed leader-follower system can be implemented for the harvesting of grains, using a combine as the leader and an unloader as the autonomous follower vehicle.<\/jats:p>","DOI":"10.3390\/s16040578","type":"journal-article","created":{"date-parts":[[2016,4,25]],"date-time":"2016-04-25T09:55:00Z","timestamp":1461578100000},"page":"578","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Vision-Based Leader Vehicle Trajectory Tracking for Multiple Agricultural Vehicles"],"prefix":"10.3390","volume":"16","author":[{"given":"Linhuan","family":"Zhang","sequence":"first","affiliation":[{"name":"Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8572, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tofael","family":"Ahamed","sequence":"additional","affiliation":[{"name":"Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8572, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yan","family":"Zhang","sequence":"additional","affiliation":[{"name":"Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8572, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pengbo","family":"Gao","sequence":"additional","affiliation":[{"name":"Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8572, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tomohiro","family":"Takigawa","sequence":"additional","affiliation":[{"name":"Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8572, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2016,4,22]]},"reference":[{"key":"ref_1","first-page":"99","article-title":"Automated follow-up vehicle system for agriculture","volume":"61","author":"Iida","year":"2001","journal-title":"J. Jpn. Soc.Agric. Mach."},{"key":"ref_2","first-page":"633","article-title":"Robot Farming System Using Multiple Robot Tractors in Japan","volume":"18","author":"Noguchi","year":"2011","journal-title":"Int. Fed. Autom. Control"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"549","DOI":"10.1002\/rob.20297","article-title":"Development and Implementation of a Team of Robotic Tractors for Autonomous Peat Moss Harvesting","volume":"26","author":"Johnson","year":"2009","journal-title":"J. Field Rob."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"263","DOI":"10.1007\/s11370-010-0071-6","article-title":"A semi-autonomous tractor in an intelligent master\u2013slave vehicle system","volume":"3","author":"Zhang","year":"2010","journal-title":"Intell. Serv. Rob."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.compag.2004.01.006","article-title":"Development of a master\u2013slave robot system for farm operations","volume":"44","author":"Noguchi","year":"2004","journal-title":"Comput. Electron. Agric."},{"key":"ref_6","unstructured":"Morin, P., and Samson, C. (2008). Springer Handbook of Robotics, Springer."},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Ou, M.Y., Li, S.H., and Wang, C.L. (2013). Finite-time tracking control for multiple non-holonomic mobile robots based on visual servoing. Int. J. Control, 12.","DOI":"10.1080\/00207179.2013.803157"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"479","DOI":"10.1002\/acs.2400","article-title":"Neural adaptive control for leader\u2013follower flocking of networked nonholonomic agents with unknown nonlinear dynamics","volume":"28","author":"Peng","year":"2014","journal-title":"Int. J. Adapt Control Signal Process."},{"key":"ref_9","first-page":"97","article-title":"Laser Scanner-Based Obstacle Detection system for Autonomous Tractor -Movement and Shape Detection Targeting at agricultural vehicle","volume":"2","author":"Kise","year":"2004","journal-title":"J. Jpn. Soc. Agric. Mach."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Johnson, E.N., Calise, A.J., Sattigeri, R., Watanabe, Y., and Madyastha, V. (2004, January 14\u201317). Approaches to Vision-Based Formation Control. Proceedings of the 43rd IEEE Conference on Decision and Control, CDC, Nassau, Bahamas.","DOI":"10.1109\/CDC.2004.1430280"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"430","DOI":"10.1002\/rob.20344","article-title":"Vision-Based Autonomous Convoying with Constant Time Delay","volume":"27","author":"Goi","year":"2010","journal-title":"J. Field Rob."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"8339","DOI":"10.3390\/s110908339","article-title":"Odometry and Laser Scanner Fusion Based on a Discrete Extended Kalman Filter for Robotic Platooning Guidance","volume":"11","author":"Espinosa","year":"2011","journal-title":"Sensors"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1793","DOI":"10.13031\/2013.29120","article-title":"Development of Auto-Hitching Navigation System for Farm Implements using Laser Range Finder","volume":"52","author":"Ahamed","year":"2009","journal-title":"Trans. ASABE"},{"key":"ref_14","first-page":"65","article-title":"Study on a Straight Follower Control Algorithm based on a Laser Scanner","volume":"67","author":"Gou","year":"2005","journal-title":"J. Jpn. Soc.Agric. Mach."},{"key":"ref_15","first-page":"68","article-title":"Navigation using a Laser Range Finder for Autonomous Tractor (Part 1)-Positioning of Implement","volume":"68","author":"Takigawa","year":"2006","journal-title":"J. Jpn. Soc. Agric. Mach."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"179","DOI":"10.1016\/j.compag.2004.01.007","article-title":"A guidance directrix approach to vision-based vehicle guidance system","volume":"43","author":"Han","year":"2004","journal-title":"Comput. Electron. Agric."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"789","DOI":"10.1016\/j.conengprac.2010.03.004","article-title":"Vision-based navigation of unmanned aerial vehicles","volume":"18","author":"Courbon","year":"2010","journal-title":"Control Eng. Pract."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"137","DOI":"10.1007\/s10846-008-9257-y","article-title":"Vision-based odometry and SLAM for medium and high altitude flying UAVs","volume":"54","author":"Caballero","year":"2009","journal-title":"J. Intell. Rob. Syst. Theory Appl."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"141","DOI":"10.4035\/jsfwr.35.141","article-title":"Studies on Visual Recognition of an Agricultural Autonomous Tractor-Detection of the Field State by Image Processing","volume":"35","author":"Hasegawa","year":"2000","journal-title":"Jpn. J. Farm Work Res."},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Kannan, S.K., Johnson, E.N., Watanabe, Y., and Sattigeri, R. (2011). Vision-Based Tracking of Uncooperative Targets. Int. J.Aerosp. Eng., 2011.","DOI":"10.1155\/2011\/243268"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"539","DOI":"10.1007\/s10846-014-0041-x","article-title":"A practical multirobot localization system","volume":"76","author":"Krajnik","year":"2014","journal-title":"J. Intell. Rob. 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