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A GPS Overview
50 MiLLennium Command Descriptions Manual
A GPS OVERVIEW
The Global Positioning System (GPS) is a satellite navigation system capable of providing a highly accurate,
continuous global navigation service independent of other positioning aids.
GPS provides 24-hour, all-weather,
worldwide coverage with position, velocity and timing information.
The system uses the NAVSTAR (NAVigation Satellite Timing And Ranging) satellites which consists of 24
operational satellites to provide a GPS receiver with a six to twelve-satellite coverage at all times depending on the
model. A minimum of four satellites in view allows the GPSCard to compute its current latitude, longitude, altitude
with reference to mean sea level and the GPS system time.
Figure A-1 NAVSTAR Satellite Orbit Arrangement
A.1 GPS SYSTEM DESIGN
The GPS system design consists of three parts:
• The Space segment
• The Control segment
• The User segment
A GPS OVERVIEW