Android relative positioning, Wifi:Time of Arrival -


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I am trying to understand how I am the relative position of Android device

(Note: Not a full position, so I can completely escape from GPS, and I need frequent and fast updates between the two devices.)

By far I've determined that algorithms like "Arrival of Time" algorithms will work, when in WiFi Will be used, if any message has been sent (from the point of view of the HW point) the right time is known.

This is where I went out of the bronchitis. Anyone has any idea how I should apply it?

The speed of light of radio signals, which is about 1 ft (0.983 ft / ns) for nanosecond . So to get 0.3 m accuracy (which is about the foot), you need half a nanosecond for your sample resolution - something that can not be done at the operating system level, where millisecond-level processing is delayed is.

Unfortunately, in order to process the time-off-arrival or time-gap-off-or-location location on Wi-Fi, you need a special chipset that provides the time-stamp field. I have not confirmed the information, but look at "Software-based trilitation of TOA and IEEE 802.11 devices in four ways" Hoene & amp; Wilmer on Citizen - Table 1 contains a list of chip vendors which implement TSF. The authors also provide their code.

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