1. Global Positioning System A tool for to build spatial information systems

2. GPS is a Satellite Navigation System Funded by and controlled by the U. S. Department of Defense (DOD). Funded by and controlled by the U. S. Department of Defense (DOD). Designed for and operated by the U. S. military but allows for civil use. Designed for and operated by the U. S. military but allows for civil use. GPS provides coded satellite signals that are processed in a receiver, which computes position, velocity and time. GPS provides coded satellite signals that are processed in a receiver, which computes position, velocity and time.

4. GPS Satellite

9. GPS receivers and the user community GPS receivers convert SV signals into position, velocity, and time estimates. GPS receivers convert SV signals into position, velocity, and time estimates. Four satellites are required to compute the four dimensions of X, Y, Z (position) and Time. Four satellites are required to compute the four dimensions of X, Y, Z (position) and Time. GPS receivers are used for navigation, positioning, time dissemination, and other research. GPS receivers are used for navigation, positioning, time dissemination, and other research.

11. Reference Peter H. Dana (1999) “Global Positioning System Overview” http://www.colorado.edu/geography/ gcraft/notes/gps/gps_f.html Peter H. Dana (1999) “Global Positioning System Overview” http://www.colorado.edu/geography/ gcraft/notes/gps/gps_f.html