Seminar - GNSS Multipath: Characterization, Modeling & Mitigation - Mar. 14
Gary McGraw
Systems Engineering Consultant
Friday, Mar. 14 | 10:40 a.m. | AERO 114
Abstract: Global Navigation Satellite Systems (GNSS) like the US Global Positioning System (GPS) are critical to the operation of many aspects of our modern society and are used daily by billions of people. A major error source for GNSS is multipath propagation and mitigating these errors is a major concern in high-accuracy positioning applications like survey, aircraft landing, and precision construction and agriculture. This talk presents an introduction to what multipath is, how it affects GNSS measurements, and ways to mitigate its effects. The use of carrier smoothing of code pseudorange measurements is discussed as an effective multipath and noise mitigation technique that does not require access to the inner workings of the receiver like other mitigation techniques require. Recent developments in approaches to statistically model multipath errors as stochastic processes and how the multipath error statistics are affected by carrier-code smoothing will be introduced. These techniques are useful in safety of life applications, like aviation navigation, where it is necessary to have statistical bounds for error sources. Ìý
Biography: Dr. Gary McGraw is a systems engineering consultant, specializing in Positioning, Navigation and Timing (PNT). He retired as a Technical Fellow at Collins Aerospace where he led the development of several high accuracy and high integrity navigation systems for civil aviation and military applications. His current research areas are focused on the use of communication data links for positioning and timing and GNSS-based aircraft landing system developments. He received the B.S. degree in Electrical Engineering and Mathematics from Iowa State University, and the M.S. and Ph.D. degrees in Electrical Engineering from the University of California, Los Angeles. Dr. McGraw is a Fellow of the Institute of Navigation (ION) and is a Senior Member of the IEEE. ÌýHe is an Associate Editor of the ION NAVIGATION journal, was the recipient of the 2011 Johannes Kepler Award from the ION, and currently serves as the ION President.