301-pp9 - UNIVERSITY OF SOUTH ALABAMA Last Time Carol...

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1 GY 301: Geomorphology GY 301: Geomorphology Lecture 9: GPS Surveying and Mapping Techniques UNIVERSITY OF SOUTH ALABAMA ht p:/ www.gpsmagazine.com/as ets/SPAC_GPS_NAVSTAR_I A_I R_I F_Constel ation_lg.jpg Last Time Carol Sawyer Guest Lecture Today’s Agenda GPS Surveying Introduction to GPS Surveying Satellite characteristics GPS receivers Lab preparation GPS Surveys • GPS = Global Positioning System GPS Surveys • GPS = Global Positioning System • Constellation of 24 satellites orbiting at 50,000 km altitude GPS Surveys • GPS = Global Positioning System • Constellation of 24 satellites orbiting at 50,000 km altitude • At a given point on the earth at least 4 satellites can be tracked by receiver simultaneously
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2 GPS Surveys • GPS = Global Positioning System • Constellation of 24 satellites orbiting at 50,000 km altitude • At a given point on the earth at least 4 satellites can be tracked by receiver simultaneously • 3 satellites plus the earth define a range of possible positions; the 4 th satellite timing is used to arrive at a
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301-pp9 - UNIVERSITY OF SOUTH ALABAMA Last Time Carol...

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