2000 Kepler Award

Presented to: Dr. Per Enge

Citation: For his continued contributions in the field of radionavigation, ranging from Loran-C, radiobeacons for DGPS broadcasts, GPS augmentations and guidance of students.


Per holds seven patents in radionavigation and communications, his latest regarding multipath equalization. Two others that propose innovative receivers for LEO (low earth orbiting) and multitone DGPS are on file. These inventions represent important enabling technologies of the augmented GPS.

He invented a signaling scheme for Loran-C, which provides a communication capacity without degrading Loran's traditional navigation function. This system is today a key part of the Eurofix system which creates synergy between Loran and GPS.

Starting in 1985, Per was funded by the U.S. Coast Guard to develop a DGPS broadcast using marine radiobeacons. As part of this effort, he designed the DGPS/radiobeacon signal and showed that this system would be a cost-effective way to deliver high accuracy to marine users. He holds two patents in this area and this work has substantially increased the robustness of the radiobeacon DGPS, now being used worldwide. Per would be anxious to share credit with his colleagues, but he has been the spearhead for much of this innovation.

Since 1991, the Federal Aviation Administration has funded him to develop WAAS and LAAS. As part of this effort, he and A.J. Van Dierendonck led the design of the WAAS signal and data format. Per's research group at Stanford University was the first to conduct real time flight trials using this data format. Additionally, Per led the development of the clock and ephemeris algorithms for one of the development systems that the FAA used to evaluate WAAS accuracy.

Finally, Per has written more than 60 articles and papers on radio navigation and communication, where more than twenty of these have appeared in refereed journals. His papers have received "Best of Session" awards at ION conferences. Per is currently Associate Editor of the Journal of the Institute of Navigation and is on the editorial board of the Proceedings of the IEEE.

One of Per's most important contributions to the field of navigation has been through Education as Professor Enge. At Worcester Polytechnic Institute and Stanford University, he has trained many students who have themselves become leading contributors to the field of navigation.

His honors include:

  • 1999 President of the Institute of Navigation
  • 1998 Executive Vice President of the Institute of Navigation
  • 1997 Burka Award for the Best Paper in the Journal Navigation
  • 1996 Thurlow Award from the Institute of Navigation
  • 1990-1999 "Best Paper of Session" awards at the annual conference on Global Positioning
  • 1988 Joseph Satin Distinguished Fellowship for Excellence in Teaching and Research