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John D. Sahr

  • Professor


Professor, Electrical & Computer Engineering
Adjunct Professor, Earth and Space Sciences
Adjunct Professor, Aeronautics and Astronautics


John Sahr is a professor of electrical engineering, adjunct in Earth and space sciences as well as aeronautics and astronautics.  His research in radar remote sensing of ionospheric turbulence involves the design, construction and operation of innovative passive radar systems, in particular the Manastash Ridge Radar.  Furthermore, Sahr and his students have developed novel Direct Sampling radar receivers which have almost no analog components, and employ high speed sampling and digital signal processing to achieve enormous linearity and dynamic range. Sahr and colleagues have recently filed provisional patents building upon the passive radar receivers in preparation for a startup that has won funding from both the UW CoMotion Innovation Fund and the Washington Research Foundation.

Research Interests

Ionospheric physics; electrojet turbulence; passive bistatic radar; radar remote sensing; radar waveform design; radar interferometry; and statistical signal processing.

Research Labs

Research Areas



  • Ph.D., Electrical Engineering, 1990
    Cornell University
  • B.S., Electrical Engineering (with honor), 1984
    California Institute of Technology