Ultrasonic positioning system for the calibration of central detector Cover Article Enhanced Publication

School of Marine Science and Technology, Northwestern Polytechnical University,Xi’an,China,710072;INPAC and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai Laboratory for Particle Physics and Cosmology,Shanghai,China,200240;Department of Physics, University of Maryland, College Park,Maryland,USA,20742;Center of High Energy Physics, Peking University,Beijing,China,100871