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Geoid :
The particular equipotential surface that coincides with mean sea level and that may
be imagined to extend through the continents. This surface is everywhere
perpendicular to the force of gravity.
Geoid height :
The height above the geoid is often called elevation above mean sea level.
Geometric Dilution of Precision (GDOP) :
See Dilution of Precision
GNSS – Global Navigation Satellite System :
Organizing concept of a European system that would incorporate GPS, GLONASS,
and other space-based and ground-based segments to support all forms of navigation.
GPS :
The U.S. Department of Defense Global Positioning System: A constellation of 24
satellites orbiting the earth at a very high altitude. GPS satellites transmit signals that
allow one to determine, with great accuracy, the locations of GPS receivers. The
receivers can be fixed on the Earth, in moving vehicles, aircraft, or in low-Earth
orbiting satellites. GPS is used in air, land and sea navigation, mapping, surveying
and other applications where precise positioning is necessary.
GPS ICD-200 :
The GPS Interface Control Document is a government document that contains the full
technical description of the interface between the satellites and the user.
Handover word :
The word in the GPS message that contains synchronization information for the
transfer of tracking from the C/A to the P-code.
Hardware :
The physical components of a computer system. Reference is often made to
“hardware” and “software”; in that context, “hardware” consists of the computer,
input and output devices and other peripheral equipment.
Integrity :
The ability of a system to provide timely warnings to users when the system should
not be used for navigation as a result of errors or failures in the system.
Interface :
A shared boundary between various systems or programs. An interface is also the
equipment or device that makes it possible to interoperate two systems. For example,
it is common to interface the 911 telephone system with a computer-aided dispatch
(CAD) system. Both hardware and software are needed to provide that interface.
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