In two-dimensional position estimates, 2dRMS encompasses 95 to 98 % of the measured points.Īlmanac A reduced version of the Ephemeris of a satellite.Almanacs for all satellites in the GPS system aretransmitted by all satellites in Subframes 4 and 5 of the Navigation Message, and are used by receivers to predict Visibilityof satellites once the receiver’s location and the current time are known. When a definition uses a term that is defined else where in this glossary, the term defined elsewhere will be written in italics.ĢdRMS : Two times the RMS Error. While many of the terms can have other definitions from those presented here, these definitions are specifically applicable to the GPS system. This glossary provides supplementary information for students of Global Positioning System (GPS) Fundamentals.
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