GPS detection in mobiles

Discussion in 'General Electronics Chat' started by aamirali, Jun 12, 2014.

  1. aamirali

    Thread Starter Member

    Feb 2, 2012
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    How does GPS locations are detected in mobiles?

    Do they have separate GPS module in it or receive information from internet or service provider
     
  2. sirch2

    Well-Known Member

    Jan 21, 2013
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    Actual GPS uses a GPS module, however on Andorid phones and may be others, this can be combined with locations of cell towers and known WiFI points etc to give extra coverage, especially in cities where GPS quality may be low due to high rise buildings etc.
     
  3. wayneh

    Expert

    Sep 9, 2010
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    Most better smartphones these days include a genuine GPS chip, although it may be lower performance than what you would buy for a dedicated GPS. Some early phones used the various triangulation methods.
     
  4. alfacliff

    Well-Known Member

    Dec 13, 2013
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    and the gps designed for cars usually have an external antenna available which increases range. the gps chip in phones have short range due to metal bodies of cars shielding them from the gps satelites. the "triangulation" of cell towers isnt a very accurate method. usually just is signal strength of a few towers, and there are no maps in phones showing the location of towers.
     
  5. sirch2

    Well-Known Member

    Jan 21, 2013
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    In Android at least, you can change between "High Accuracy" which uses both GPS and triangulation, "Battery saving" which just uses triangulation and "Device only" which uses just GPS. So at least Google would have you believe that GPS+Triangulation is more accurate.
     
  6. alfacliff

    Well-Known Member

    Dec 13, 2013
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    as someone who has done a =number of hidden transmitter hunts in cities, there is no "triangulation" method that is very accurate. reflections off buildings is intense and makes distance or bearing measurement dificult. triangulation with cell towers is just seeing how many towers you hit and getting a little info from the published tower range map.
     
  7. wayneh

    Expert

    Sep 9, 2010
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    Wifi location is fairly accurate when it can be used, but spotty and not reliable. My gym recently installed a new wifi system and for a period of time it could not be used to locate my location.
     
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