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History of GPS 1978 : First GPS satellite launch 1983: GPS revealed (Top Secret till then…)

History of GPS 1978 : First GPS satellite launch 1983: GPS revealed (Top Secret till then…) 1994: All 24 satellites operational

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History of GPS 1978 : First GPS satellite launch 1983: GPS revealed (Top Secret till then…)

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  1. History of GPS 1978: First GPS satellite launch 1983: GPS revealed (Top Secret till then…) 1994: All 24 satellites operational 1999: Global Positioning System modernized with two new civil signals added to future GPS satellites, significantly enhancing the service provided to civil, commercial, and scientific users worldwide. 2000: Selective availability permanently turned off 2004: Legislation signed to keep civilian service free world wide Recreational: $100 - $500 10 m accuracy Mapping grade $3000 - $25000 Submeter with post processing TREK-Tech: A Walking Tour of Santa Monica using GPS • Receivers • Cost reflects: • Antenna quality • Clock quality • Memory • Software • Look for • Patch antenna • Easy to read menus • WAAS enabled • Computer hookup • Technical support Multipath Error = Increases the length of time for a signal to reach the receiver. • Map Datums • Earth model to reference and compute coordinates • GPS based on World Geodetic System 1984 (WGS 84) • USGS quad maps based on North American Datum 1927 • (NAD27) • Some US maps are based on NAD83 (=WGS84) • Canadian maps are based on NAD83 • Other countries have their own datums • GPS Receiver set up must match map. • Satellites • About 31 satellites • Cesium or Rubidium clocks. • Very high orbits • Several replaced every year. • 6 orbital planes ensure at least 4 or more satellites available at almost all times. WAAS • The Federal Aviation Administration (FAA) and the Department of Transportation (DOT) are developing the Wide Area Augmentation System for use in precision flight approaches. • 25 ground reference stations positioned across US monitor GPS satellite data. • The corrected differential message is then broadcast through one of two geostationary satellites. • Currently, WAAS coverage is only in US • Any receiver with a WAAS antenna can receive the signal but must enabled through setup. Created by J. Myhre – Nordic Geospatial Consulting LLC - www.nordicgeospatial.com

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