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The Jiangmen Underground Neutrino Observatory (JUNO) is a multifunctional neutrino-oscillation experiment, aiming to determine the neutrino mass hierarchy and precisely measure three neutrino oscillation parameters, of which the calibration system is essential to the response of the detector. This paper presents a calibration system consisting of Remotely Operated Vehicles and Sonar Positioning System, focusing on the positioning of the Remotely Operated Vehicles. The design principles and theoretical analysis are discussed as well as specific requirements. The corresponding motion control mode is then proposed. The experiment is further performed to validate the accuracy of horizontal and vertical positioning devices. It is shown that the designed device can satisfy the harsh requirements from JUNO, including radioaction, compatibility, and magnetic effects. The speed limit (1 m/min) at the horizontal plane and positioning accuracy (30 mm/5 min) in three dimensions are also ensured, indicating the performance of the calibration system is well tested. The motion control of the positioning device in the liquid scintillator environment is finally predicted. The proposed Remotely Operated Vehicle together with the Sonar Positioning System can provide the calibration operation in JUNO.

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