2003 Fellow

Presented to: Mr. John A. Klobuchar

Citation: For more than 25 years of continuing contributions to satellite navigation regarding the evaluation and specifi cation of the effects of the ionosphere on satellite navigation signals.


Although John (Jack) Klobuchar's field (Atmospheric Research Scientist) was not originally navigation, he has been supporting satellite navigation since the early 1970s as a leading expert on the effects of the ionosphere on satellite navigation signals. As a senior physical scientist at the Air Force Research Laboratory (AFRL), the GPS Joint Program Office asked him to develop an ionospheric delay model for GPS single-frequency users to be broadcast from the GPS satellites. His successful model became known as "Klobuchar Model." He has been called upon to evaluate numerous other effects of the ionosphere on the GPS signal, especially the effects of ionospheric phase and amplitude scintillation. Before retiring from the AFRL, he sponsored a Small Business Innovative Research (SBIR) program for the development of a GPS Ionospheric Scintillation Monitor that measures and computes a variety of scintillation parameters that describe those effects. The SBIR project led to the development of a commercial product that is used worldwide for monitoring ionospheric scintillation effects.

Mr. Klobuchar is currently with Innovative Solutions International where he leads the FAA ionospheric research efforts for Space Based Augmentation Systems. He is also the FAA representative to and the U.S. co-chair of the International Working Group on Atmospheric Effects on SBAS. He is vice chair of the URSI international working group on Studies of the Ionosphere using Satellite Beacon Signals. He has organized and chaired numerous sessions on atmospheric effects for various ION conferences, and he has been the co-chair of the Triennial Ionospheric Effects Symposia, held in Washington, D.C., every three years since 1975.

Mr. Klobuchar is an author or co-author of over 70 papers in refereed journals. He is a Fellow of the IEEE, a member of URSI, the American Geophysical Union, the American Association for the Advancement of Science, and the Institute of Navigation.

He received his B.S. and M.S. degrees in electrical engineering from the University of Illinois, Urbana, in 1958 and 1960, respectively.