Precise Positioning, Navigation, and Timing (PNT)

Friday, February 23 at 3:30pm

Toomey Hall, 140
400 W. 13th St., Rolla, MO 65409

You're invited to a seminar with Dr. Jian Yao, a scientist at the University Corporation for Atmospheric Research (UCAR), titled "Precise Positioning, Navigation, and Timing (PNT)."

Abstract: Positioning, Navigation, and Timing (PNT) is a vital area for people’s daily life, high-tech, satellite industry, and military usage. Historically, this area originated from a fundamental question – where we are in the universe – which was addressed by observing the star locations in the sky and more importantly the periodic motions of the Sun and the Moon. Nowadays, this area is dominated by the Global Navigation Satellite System (GNSS), including the U.S.-built Global Positioning System (GPS). I will review the basic principle of GNSS and then discuss how to achieve the centimeter-level accuracy & precision for ground and space navigation. I will talk about some of my research work, such as the generation of the GNSS satellite ephemerides, GNSS time dissemination, the generation of the U.S. standard time incorporating optical clocks, precise orbit determination (POD), and the application of POD towards atmospheric density sensing for space collision avoidance. The future PNT directions/applications will also be discussed.

Biography: Dr. Jian Yao is a scientist at the University Corporation for Atmospheric Research (UCAR), which manages the National Center for Atmospheric Research (NCAR). There, he works on the orbits & clocks of GNSS (Global Navigation Satellite System) and LEO (low-Earth-orbit) satellites and applies precise satellite orbits & clocks to GNSS radio occultation and atmospheric density sensing. He is also an adjunct associate professor at Colorado State University where he teaches the GNSS courses and supervises graduate students. He used to work at the U.S. National Institute of Standards and Technology (NIST) and NOAA’s National Geodetic Survey, both under the U.S. Department of Commerce, for many years. He has published ~ 40 papers covering a variety of topics in the area of positioning, navigation, and timing (PNT), such as GNSS satellite ephemeris, GNSS data processing, precise orbit determination, GNSS time transfer, and atomic-clock timing systems. In 2014, he received a Ph.D. degree from the University of Colorado at Boulder.

Event Type

Meetings, Lectures and Conferences


College of Engineering and Computing, Mechanical and Aerospace Engineering

Open to Public


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