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Minor nitpick: AGPS, or Assisted GPS is actually almost the same as GPS. The only difference is that it gets the Almanach data off the Internet, instead of the
by emilecantin 11y ago
Minor nitpick: AGPS, or Assisted GPS is actually almost the same as GPS. The only difference is that it gets the Almanach data off the Internet, instead of the satellites themselves (the satellites are constantly broadcasting that data, but it takes a few minutes to download it all).
- TickleSteve 11y agoAGPS isnt similar to GPS... it is GPS. Like you say the almanac (and ephemeris) data is preloaded over an IP network to provide for a better TTFF (Time-To-First-Fix). Also since the locations of the currently associated mobile tower is known, that is used as a seed for the GPS fix (or even a crude triangulation based on the signal strength from multiple towers).