Indoor Positioning System based on Gyroscope and Accelerometer

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Gyros and accelerometers are not enough.

You get position by integrating the linear acceleration twice but the error is horrible. It is useless in practice.

Here is an explanation by (Google Tech Talk) at 23:20. I highly recommend this video.

As for indoor positioning, I have found these useful:

I have no idea how these methods would perform in real-life applications or how to turn them into a nice Android app.

A similar question is Calculating distance within a building.

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