April 2008 Meeting Summary

On April 23, 2008, the Southern California Chapter of the ION held a meeting, hosted by NavCom in Torrance, CA.  The meeting included a presentation from Dr. Per Enge of Stanford University on the subject of the future GNSS-based Aviation Precision Approach.  A short biography and abstract of the meeting follows.

Capsule Biography of Dr. Per Enge 
Per Enge is a professor at Stanford University, where he directs the Center for Position Navigation and Time.  In the distant past, he helped to design solid state Loran transmitters, and he still works on enhanced Loran.  In the not so distant past, he led the development of radio beacons to broadcast differential corrections at medium frequency to marine and land-based users of GPS.  These days, he spends most of his time on the local and wide area augmentation systems.  Per Enge has received the Kepler, Thurlow and Burka Awards from the ION for his work.  He is also a Member of the National Academy of Engineering and a Fellow of the ION and the IEEE.

Abstract of Per Enge’s Talk: Future GNSS Architecture for Aviation

By 2020, GNSS will provide precision approach guidance worldwide.  This capability will be born of three important technologies.  First and foremost, avionics will receive two frequencies: L1/E1 and L5/E5b.  This frequency diversity will do much to obviate the impact of ionospheric storms and radio frequency interference. Second, a multiplicity of data broadcasts will be used to convey integrity information from the ground to the airborne users.  These will include the GNSS satellites themselves, geostationary satellites and regional networks of VHF transmitters and airport specific VHF data broadcast (VDB). However, the most important change will be the most subtle.  The fault monitoring burden will be split between the aircraft and the supporting ground systems in a new way.  This new integrity architecture for aviation is the subject of this talk.