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Z-Curve: A Geographical Projection of GNSS (Global Navigation Satellites Systems) Signal, Time, and Position

November 16, 2017
3:00 pm - 4:00 pm

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Guoyu (Michael) Fu
Department of Computer Science & Engineering, Texas A&M University

Graduate Student


This talk presents a novel geometric model to characterize the zero-­crossing curve (or z-­curve) for the signals emitted by a pair of GNSS satellites, which is the intersection of the Earth surface and the z‐surface that has zero difference in its pseudoranges to the two satellites. As a form of the Time Difference of arrival (TDOA), modeling of the z-­surface/z-­curve benefits from elimination of the common error terms shared by the pair of pseudoranges, such as the receiver clock offset, so that the resulting model could be used for design of advanced applications, such as timing and positioning integrity monitors, and tools for geodetic, atmospheric measurements. In this talk, Guoyu will present the derivation of z-­curve models, and the terrestrial service volume (TSV) of GNSS satellite, and their relationship with the Earth surface. The model is capable to represent the morphing with respect to the changes in satellite positions and air transmission delays. He will also introduce an algebraic method to parameterize them in terms of geocentric latitude and longitude.


Guoyu Fu is a 5th-­year Ph.D. student in the Department of Computer Science and Engineering at Texas A&M University. He received his B.E. degree in Systems and Control from Nanjing University, China. His research interests include GNSS system modeling for high confidence requirements such as integrity check, multipath avoidance, mobile robots, and next generation of distributed computing.


Dr. Michael Bishop: michael.bishop@tamu.edu


November 16, 2017
3:00 pm - 4:00 pm


Eller O&M Bldg. Rm 807