DEVELOPMENT OF A GPS ANTENNA The Geosciences Research Division of the U.S. Department of Commerce, National Oceanic and Atmospheric Administration plans to investigate the design and construction of a multi-path rejecting dual-band GPS antenna for use in precise (mm-level) geodesy and navigation applications. The antenna will have high efficiency, a stable phase center, and a fixed (non-steerable) beam that is omni-directional in the upper (sky) hemisphere while rejecting signals from the lower (ground) hemisphere. Size and weight are important considerations. Comments are invited. E-MAIL: Dave Zilkoski, Davez@ngs.noaa.gov. Posted 01/29/99 (W-SN292658).

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