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Encyclopedia > Assisted GPS

GPS is a satellite based positioning system. Assisted GPS, or A-GPS was introduced to enhance performance. The development of A-GPS was accelerated by the U.S. FCC's E911 mandate requiring the position of a cell phone to be available to emergency call dispatchers. [1] GPS redirects here. ... For other uses, see Satellite (disambiguation). ... FCC redirects here. ... 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. ... 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). ...


Conventional GPS then had difficulty providing reliable positions in poor signal conditions. For example when surrounded by tall buildings (as a result of multipath), or when the satellite signals are weakened by being indoors or under trees. Some newer receivers are far better. PRIMERGY MultiPath PRIMERGY MultiPath supports redundant Fiber Channel paths, the configured connections between server and subsystem that are such an important component of disaster-tolerant servers and clusters. ...


In addition, when first turned on in these conditions, some non-A-GPS units may not be able to download the almanac and ephemeris information from the GPS satellites, rendering them unable to function until a clear signal can be received continuously for up to one minute. An ephemeris (plural: ephemerides) (from the Greek word ephemeros = daily) is a device giving the positions of astronomical objects in the sky. ...


An A-GPS receiver can address these problems in several ways, using an Assistance Server:

  • The Assistance Server can locate the phone roughly by what cell site it is connected to on the cellular network.
  • The Assistance Server has a good satellite signal, and lots of computation power, so it can compare fragmentary signals relayed to it by cell phones, with the satellite signal it receives directly, and then inform the cell phone or emergency services of the cell phone's position.
  • It can supply orbital data for the GPS satellites to the cell phone, enabling the cell phone to lock to the satellites when it otherwise could not, and autonomously calculate its position.
  • It can have better knowledge of ionospheric conditions and other errors affecting the GPS signal than the cell phone alone, enabling more precise calculation of position. (See also Wide Area Augmentation System)

Some A-GPS solutions require an active connection to a cell phone (or other data) network to function, in others [2] [3] it simply makes positioning faster and more accurate, but is not required. A cleverly mounted base station on top of an Electricity pylon. ... The tone or style of this article or section may not be appropriate for Wikipedia. ... An ephemeris (plural: ephemerides) (from the Greek word ephemeros = daily) is a device giving the positions of astronomical objects in the sky. ... The ionosphere is the part of the atmosphere that is ionized by solar radiation, and too tenuous to be cooled by contact with other air. ... WAAS System Overview The Wide Area Augmentation System (WAAS) is an extremely accurate navigation system developed for civil aviation by the Federal Aviation Administration (FAA), a division of the United States Department of Transportation (DOT). ...


As an additional benefit, it can reduce both the amount of CPU and programming required for a GPS Phone by offloading most of the work onto the assistance server. (This is not a large amount for a basic GPS - many early GPSs ran on 386/16 or similar hardware). CPU can stand for: in computing: Central processing unit in journalism: Commonwealth Press Union in law enforcement: Crime prevention unit in software: Critical patch update, a type of software patch distributed by Oracle Corporation in Macleans College is often known as Ash Lim. ... A GPS Phone is a mobile phone with an integrated GPS system which can be used for traveling and tracking purposes. ...


High Sensitivity GPS is an allied technology, that addresses some of the same issues in a way that does not require additional infrastructure. It notably cannot provide instant fixes when the phone has been off for some time, that some forms of A-GPS can. There are very few or no other articles that link to this one. ...

Contents

Development

The upcoming next version and implementation of Assisted GPS is called eGPS.


Implementations

  • Sprint Navigation
  • VZ Navigator
  • Sony Ericsson XPERIA X1
  • Sony Ericsson C702
  • N95 (After firmware v12 update)
  • Nokia N96
  • Nokia N82
  • Nokia E90 Communicator (after 7.40.1.2 firmware update)

N95 can refer to: The Nokia N95 multimedia computer/smartphone. ... A Nokia N82 mobile phone The Nokia N82 is a mobile phone produced by Nokia. ... Nokia E90 Communicator is a 3G smartphone made by Nokia and the latest model of the Communicator series. ...

See also

A GPS Phone is a mobile phone with an integrated GPS system which can be used for traveling and tracking purposes. ... There are very few or no other articles that link to this one. ... Augmentation of a Global Navigation Satellite System (GNSS) or Blended navigation is a method of improving the navigation systems attributes, such as accuracy, reliability, and availability, through the integration of external information into the calculation process. ... WAAS System Overview The Wide Area Augmentation System (WAAS) is an extremely accurate navigation system developed for civil aviation by the Federal Aviation Administration (FAA), a division of the United States Department of Transportation (DOT). ... Differential Global Positioning System (DGPS) is an enhancement to Global Positioning System that uses a network of fixed ground based reference stations to broadcast the difference between the positions indicated by the satellite systems and the known fixed positions. ... An inertial navigation system measures the position and altitude of a vehicle by measuring the accelerations and rotations applied to the systems inertial frame. ...

External links

  • CSR Tutorial on eGPS and Indoor Positioning
  • AssistNow Online and Offline A-GPS Services - u-blox
  • Instant positioning anytime and under any signal conditions - AssistNow article - u-blox
  • Indoor GPS: The No-Chip Challenge
  • Article from GPS World - Assisted GPS: A Low-Infrastructure Approach
  • Everything you want to know about E911 and E112 - many E911 & E112 related links
  • Global Locate AGPS Overview
  • Septier Communication Assisted GPS Implementation

  Results from FactBites:
 
Instant Positioning Anytime with Assisted GPS and AssistNow (1052 words)
Assisted GPS, or A-GPS, is a service that enables immediate positioning on demand, 24 hours a day, 7 days a week.
Assisted GPS services enable applications that provide on the go, accurate and reliable location information with minimal maintenance.
A-GPS can now be offered to a much broader public and the provision of instant positioning services is soon to become the next must-have feature for leisure and professional GPS-enabled devices.
Assisted GPS - Wikipedia, the free encyclopedia (475 words)
GPS uses a network of 24 satellites to triangulate a receiver’s position and provide latitude and longitude coordinates.
In A-GPS networks, the receiver, being limited in processing power and normally under less than ideal locations for position fixing, communicates with the assistance server that has high processing power and access to a reference network.
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.
  More results at FactBites »

 
 

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