Sunday, September 8 — 8:00 AM - 11:00 AM

Avionics - II Track

Topics Covered
  • Radio Navigation before space-based navigation
  • Orbits and Kepler
  • Early experiments leading to space-based navigation
  • The NAVSTAR, (GPS) system
  • Determining position using GNSS
  • The importance of precise timekeeping
  • Modulation of the signals in space
  • Working with spread spectrum signals
  • The navigation message
  • Dilution of precision
  • The need for GNSS augmentation

Al Helfrick

Embry-Riddle Aeronautical University

Dr. Al Helfrick is a Professor Emeritus at Embry-Riddle Aeronautical University. He started his career in radiation hardening of military systems, then after a stint in the military (including a tour of duty in Vietnam), continued in the fields of cable television, test and measurement, avionics and finally as an independent consultant. He joined ERAU in 1991 and retired in 2015 after serving as both a professor and department chairman. He is still active in academia, continues to publish and present papers at conferences, and occasionally regales audiences with reminiscences from his career.