1. Associate Professor, Satellite Positioning and Inertial Navigation (SPIN) Laboratory, Dept. of Civil and Environmental Engineering and Geodetic Science, The Ohio State Univ., 470 Hitchcock Hall, Columbus, OH 43210-1275. E-mail: dbrzezinska@osu.edu
2. Postdoctoral Researcher, Satellite Positioning and Inertial Navigation (SPIN) Laboratory, Dept. of Civil and Environmental Engineering and Geodetic Science, The Ohio State Univ., 470 Hitchcock Hall, Columbus, OH 43210-1275.
3. Chief Geodesist, NOAA National Geodetic Survey, 1315 East-West Hwy., Silver Spring, MD 20910.
4. Visiting Research Physicist, National Geodetic Survey, NOS/NOAA and Cooperative Institute for Research in Environmental Sciences (CIRES), Univ. of Colorado/NOAA, Boulder, CO 80309-0216.