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Encyclopedia > AGPS

AGPS or Assisted GPS is a variant of GPS used in cell phones. It uses an assistance server to cut down the time needed to find the location. GPS uses a network of 24 satellites to triangulate a receiver’s position and provide latitude and longitude coordinates. ... Over fifty GPS satellites such as this NAVSTAR have been launched since 1978. ... Motorola T2288 mobile phone A mobile phone is a portable electronic device which behaves as a normal telephone whilst being able to move over a wide area (compare cordless phone which acts as a telephone only within a limited range). ...


Assisted GPS describes a system where outside sources, such as assistance server (Mobile Location Server) via a network, help a GPS receiver perform the tasks required to make range measurements and position solutions. The assistance server has the ability to access information from the reference network and also has computing power far beyond that of the GPS receiver. In this case, the assistance server communicates with the GPS receiver on the mobile phone on a network. With assistance from the network, the receiver can operate more quickly and efficiently than it would unassisted, because a set of tasks that it would normally handle is shared with the assistance server. The resulting AGPS system boosts performance beyond that of the same receiver in a stand-alone mode.


Ordinarily, a standard GPS device needs to have a clear line-of-sight to three or four GPS satellites before it can calculate its position. In addition, it needs enough processing power to transform the data streams from the satellites into a position. Using AGPS, the cell tower will receive the signal from several satellites, and perform the calculations. That way, all that is required is for the phone to relay any GPS signal it receives to the tower. When viewing a scene, as in optics, photography, or even hunting, the line of sight is the straight line between the observer and the target. ... A satellite is an object that orbits another object (known as its primary). ...


The main purpose of AGPS is to provide municipalities with location-based emergency phone service, such as E911 service. Enhanced 911 service or E911 service is a North American telephone network feature that automatically associates the physical address with the calling partys telephone number. ...


External links

  • Radio-Electronics.Com
  • Article from GPS World - Assisted GPS: A Low-Infrastructure Approach

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