2000 Weems Award

Presented to: Dr. Rudolph M. Kalafus

Citation: For his significant contributions, guidance and chairmanship in the development of RTCM Special Committee 1044 Recommended Standards for Differential GNSS Service, since its inception in 1983.


Dr. Rudolph M. Kalafus is currently head of the Military & Advanced Systems Core Technology Group at Trimble Navigation. While at Trimble, he helped develop differential GPS systems and aeronautical receivers. He has been active in RTCA SC-159 for 15 years, recently serving as chair of the Interference Working Group. There, he helped develop standards for GPS receivers, including receiver-autonomous integrity monitoring algorithms, special CAT-I, WAAS and LAAS receivers. Since its inception in 1983, he has been chair of RTCM SC-104, Recommended Standards for Differential GNSS Service. These standards are used throughout the world for differential and real-time kinematic services. While at the Transportation Systems Center from 1970 to 1987, he was active in aircraft navigation and surveillance system development, notably MLS and GPS, and was instrumental in the early development of the Coast Guard radio beacon-based differential GPS broadcast network.

He received his Ph.D. in electrical engineering from the University of Michigan in 1966 where he also received his B.S.E.E. and M.S.E.E.