Precise indoor smartphone tracking

Shopkick uses the build in microphone of a smartphone, currently iOS or Android based, to triangulate its position via a network of ultrasonic beacons. Other then satellite based systems like GPS this allows a more precise location tracking especially in indoor situations where GPS is not or poorly available. Shopkick did a first installation in a Best Buy in San Francisco as part of a POS application.

See also this article here: technologie review article …

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