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1 handwiki Dean Liu -- 1157 2022-11-25 01:34:21

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HandWiki. Assisted GPS. Encyclopedia. Available online: https://encyclopedia.pub/entry/36590 (accessed on 24 September 2026).
HandWiki. Assisted GPS. Encyclopedia. Available at: https://encyclopedia.pub/entry/36590. Accessed September 24, 2026.
HandWiki. "Assisted GPS" Encyclopedia, https://encyclopedia.pub/entry/36590 (accessed September 24, 2026).
HandWiki. (2022, November 25). Assisted GPS. In Encyclopedia. https://encyclopedia.pub/entry/36590
HandWiki. "Assisted GPS." Encyclopedia. Web. 25 November, 2022.
Assisted GPS
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The content is sourced from: https://handwiki.org/wiki/Engineering:Assisted_GPS

Assisted GPS or Augmented GPS (abbreviated generally as A-GPS and less commonly as aGPS) is a system that often significantly improves the startup performance—i.e., time-to-first-fix (TTFF)—of a GPS satellite-based positioning system. A-GPS is extensively used with GPS-capable cellular phones, as its development was accelerated by the U.S. FCC's 911 requirement to make cell phone location data available to emergency call dispatchers.

cell phone location data time-to-first-fix agps

References

  1. "NavCen GPS User. 3.5.3 Almanac Collection". http://www.navcen.uscg.gov/pubs/gps/gpsuser/gpsuser.pdf. Retrieved 2017-04-02. 
  2. Low, Aloysius. "Phones". CNET. http://www.cnet.com.au/mobilephones/phones/0,239025953,339281483,00.htm. Retrieved 2017-04-02. 
  3. "iPhone Secrets and iPad Secrets and iPod Touch Secrets". 2010-09-30. http://www.edepot.com/iphone.html#iPhone. Retrieved 2017-04-02. 
  4. "GPS vs. aGPS: A Quick Tutorial | Windows Central". 2009-01-03. http://www.wpcentral.com/gps-vs-agps-quick-tutorial. Retrieved 2017-04-02. 
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HandWiki
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