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    The Difference between GPS and GPS Tracker Time:2013-05-27 04:25:48
     The Global Positioning System (GPS) is a space-based satelite navigation  system that provides location and time information in all weather conditions, anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites. The system provides critical capabilities to military, civil and commercial users around the world. It is maintained by the United States government and is freely accessible to anyone with a GPS receiver.

     

    The GPS project was developed in 1973 to overcome the limitations of previous navigation systems, integrating ideas from several predecessors, including a number of classified engineering design studies from the 1960s. GPS was d and realized by the U.S. Department of Defense  and was originally run with 24 satellites. It became fully operational in 1994. Roger L. Easton  is generally credited as its inventor.

     

    Advances in technology and new demands on the existing system have now led to efforts to modernize the GPS system and implement the next generation of GPS III satellites and Next Generation Operational Control System (OCX). Announcements from the Vice President and the White House in 1998 initiated these changes. In 2000, U.S. Congress authorized the modernization effort, GPS III.

     

    In addition to GPS, other systems are in use or under development. The Russian Global Navigation Satellite System (GLONASS) was developed contemporaneously with GPS, but suffered from incomplete coverage of the globe until the mid-2000s. There are also the planned European Union Galileo positioning system, Chinese Compass navigation system, and India Regional Navigational Satellite System.

     

    A GPS tracking unit is a device that uses the Global Position System to determine the precise location of a vehicle, person, or other asset to which it is attached and to record the position of the asset at regular intervals. The recorded location data can be stored within the tracking unit, or it may be transmitted to a central location data base, or internet-connected computer, using a celluar (GPRS or SMS), radio,or satellite modern embedded in the unit. This allows the asset's location to be displayed against a map back either in real time or when analyzing the track later, using GPS tracking systems.

     

    A GPS tracker essentially contains GPS module to receive the GPS signal and calculate the coordinates. For data loggers it contains large memory to store the coordinates, data pushers additionally contains the GSM/GPRS modem to transmit this information to a central computer either via SMS or via GPRS in form of IP packets. The diagram depicts a hardware architecture of an advanced GPS tracker.

     

    Usually, a GPS tracker will fall into one of these three categories, though most smartphones, being GPS Phones, can work in all these modes, depending on which mobile applications are installed: Data loggers, Data pushers, Personal tracking, Asset tracking and so on.

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