assisted GNSS
Sign in to saveAlso known as AGPS, A-GPS, aGPS, Assisted GPS, A-GPS , aGPS, assisted GPS
system to improve the time-to-first-fix of a GNSS receiver
~8 min read
Encyclopedic overview
Assisted GPS Assisted GNSS (A-GNSS) is a GNSS augmentation system that often significantly improves the startup performance—i.e., time-to-first-fix (TTFF)—of a global navigation satellite system (GNSS). A-GNSS works by providing the necessary data to the device via a radio network instead of the slow satellite link, essentially "warming up" the receiver for a fix. When applied to GPS, it is known as assisted GPS or augmented GPS (abbreviated generally as A-GPS and less commonly as aGPS). Other local names include A-GANSS for Galileo and A-Beidou for BeiDou.
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.
Excerpted from Wikipedia’s “assisted GNSS” article, available under the CC BY-SA 4.0 licence.