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Smartphone with FM Radio Tells Your Position

posted by LaminatorX on Wednesday May 21 2014, @03:54PM   Printer-friendly
from the Radio-Gaga dept.

kaszz writes:

The reason why FM receivers are present on smartphones is that they can be used to locate your position by noting a simple thing as signal strength of transmitters. More advanced methods makes use of SNR, frequency deviation and multipath interference characteristics. And the same method can be used for WiFi which of course makes collection of such data very useful for localization purposes where GPS etc isn't useful. Arrival time of a radio signal that is reported to the operator from many devices may also be used for the same purpose.

 
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  • (Score: 1) by MostCynical on Thursday May 22 2014, @03:28AM

    by MostCynical (2589) on Thursday May 22 2014, @03:28AM (#46247) Journal

    My Samsung i9197 (S4 mini) and many other "new fangled" phones sold in Australia have fm radio.

    There are have been moves to get people onto digital radio (DAB) but until they force it (as they did by turning off analgue tv), most people listen to FM and even AM radio (although many "young people" can bee seen using headphones while driving.. Which is one reason why emergecy services vehicles now have an extra "very loud" siren setting now)

    --
    "I guess once you start doubting, there's no end to it." -Batou, Ghost in the Shell: Stand Alone Complex