During May 22-23, Professor Per Enge from Stanford University, Doctor Expert in satellite navigation A.J. Van Dierendonck, Professor Penina Axelrad from University of Colorado, Doctor Todd Walter from Stanford University, Doctor Kevin Chin from Trimble Navigation Research Institute and Doctor Grace Gao from Stanford University paid a two-day exchange visit to NTSC at the invitation of Lu Xiaochun, Deputy Director in CAS Key Laboratory of Positioning and Time-keeping in Precision Navigation, Researcher and Director in Navigation and Communication Dept.

NTSC Deputy Director Dou Zhong met with these foreign experts and introduced basic situation of NTSC time system, research field and scientific research progress; American experts spoke highly of the work done by NTSC. Both sides also reached consensus on regularly having academic discussion, exchange visit of scientific research personnel, postdoctor cultivation, etc.

On May 22, members in NTSC Navigation and Communication Dept. had technical discussion with these American experts, who also visited the Time-frequency Standard Lab of NTSC, Quantum Frequency Standards Lab., CAPS Master Control Station and GNSS spatial signal quality monitoring and detection system, etc.

On May 23, Professor Per Enge, Doctor A.J. Van Dierendonck and Professor Penina Axelrad respectively gave scientific research report of “A Global Safety of Life Service from Multiple GNSS Constellations”, “Development of the GPS L5 Signal” and “Application of GNSS to Environmental Studies” in the lecture hall on the 3rd floor of the Scientific Research Building; over 60 postgraduates studying in the NTSC and related researchers attended the symposiums.