self-contained end-to-end radiometer calibration systems, the use of stationary statistical properties of upwelling radiances to constrain absolute accuracy and the long-term stability of satellite measurements, and the profiling of the lower, middle, and upper atmosphere using multispectral, multisensor, and climatological databases. Before assuming his position at the University of Michigan, Dr. Ruf had been an instrument scientist for the NASA TOPEX and Jason-I microwave radiometers, and he is currently a science team member for the NASA Juno, Aquarius, and Global Precipitation Measurement (GPM) Microwave Imager microwave radiometers. Dr. Ruf has received numerous awards, including the International Geoscience and Remote Sensing Symposium Prize Paper Award. He is the editor in chief of the IEEE Transactions on Geoscience and Remote Sensing, a member of URSI Commission F, and a past member of the NRC’s Committee on Radio Frequencies.


Frederick S. Solheim is the president of Radiometrics Corporation, where he develops ground-based microwave radiometers for atmospheric and terrestrial remote sensing. Dr. Solheim was heavily involved with the development of the patented frequency-agile design that allows flexibility for a variety of atmospheric remote sensing applications used in the company’s radiometers. His research interests include microwave radiometry and radiosonding for profiles of temperature, water vapor, and cloud liquid. Dr. Solheim also conducts research in signal propagation. Previously he worked with the University Corporation for Atmospheric Research in Boulder, Colorado.


David H. Staelin is a professor of electrical engineering in the Department of Electrical Engineering and Computer Science (EECS) at the Massachusetts Institute of Technology (MIT). He has been a member of the EECS faculty and the Research Laboratory of Electronics since 1965. He also was the assistant director, MIT Lincoln Laboratory (1990-2001); co-founder, MIT Venture Mentoring Service (2000); chair, MIT’s EECS Graduate Area in Electronics, Computers, and Systems (1976-1990); and a faculty member of MIT’s Leaders for Manufacturing Program (1985-1998). He was a director of Environmental Research and Technology, Inc. (1969-1978) and a co-founder and chair of PictureTel Corp. (1984-1987). His research interests include remote sensing, wireless communications, signal processing, estimation, environmental sensing, microwave atmospheric sounding, and meteorological satellites. Dr. Staelin was a member of the President’s Information Technology Advisory Committee (2003-2005), chair of the NRC’s Committee on Radio Frequencies (1983-1986), and a member of several NASA committees and working groups, including the Space Applications Advisory Committee, the Advanced Microwave Sounder Working Group, the Geostationary Platform—Earth Science Steering Committee; and the Tropical Rainfall Measuring Mission Science Steering Group. He was the principal investigator for the NASA Nimbus-E Micro-



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