Global Positioning System (GPS) is a worldwide
radio-navigation system formed from the constellation of 24 satellites and
their ground stations. The Global Positioning System is mainly funded and
controlled by the U.S Department of Defense (DOD). The system was initially
designed for the operation of U. S. military. But today, there are also many
civil users of GPS across the whole world. The civil users are allowed to use
the Standard Positioning Service without any kind of charge or restrictions.
Global Positioning System tracking is a method of working
out exactly where something is. A GPS tracking system, for example, may be
placed in a vehicle, on a cell phone, or on special GPS devices, which can
either be a fixed or portable unit. GPS
works by providing information on exact location. It can also track the
movement of a vehicle or person. So, for example, a GPS tracking system can be
used by a company to monitor the route and progress of a delivery truck, and by
parents to check on the location of their child, or even to monitor high-valued
assets in transit.
A GPS tracking system
uses the Global Navigation Satellite System (GNSS) network. This network
incorporates a range of satellites that use microwave signals that are
transmitted to GPS devices to give information on location, vehicle speed, time
and direction. So, a GPS tracking system can potentially give both real-time
and historic navigation data on any kind of journey.
GPS provides special
satellite signals, which are processed by a receiver. These GPS receivers not
only track the exact location but can also compute velocity and time. The
positions can even be computed in three-dimensional views with the help of four
GPS satellite signals. The Space Segment of the Global Positioning System
consists of 27 Earth-orbiting GPS satellites. There are 24 operational and 3
extra (in case one fails) satellites that move round the Earth each 12 hours
and send radio signals from space that are received by the GPS receiver.
The control of the
Positioning System consists of different tracking stations that are located
across the globe. These monitoring stations help in tracking signals from the
GPS satellites that are continuously orbiting the earth. Space vehicles
transmit microwave carrier signals. The users of Global Positioning Systems
have GPS receivers that convert these satellite signals so that one can
estimate the actual position, velocity and time.
The operation of the
system is based on a simple mathematical principle called trilateration.
Trilateration falls into two categories: 2-D Trilateration and 3-D
Trilateration. In order to make the simple mathematical calculation the GPS
receiver must know two things. First it must know the location of the place is
to be traced by at least three satellites above the place. Second, it must know
the distance between the place and each of those Space Vehicles. Units that
have multiple receivers that pick up signals from several GPS satellites at a
same time. These radio waves are electromagnetic energy that travels at the
speed of light. So if you want to buy GPS and navigation tracking systems visit
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