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Uplink Time Difference of Arrival

U-TDOA is a position-location technology for mobile phone networks. It uses advanced triangulation techniques to determine the precise location of a mobile phone.

Unlike competing E-OTD technology, U-TDOA works with any mobile phone; it does not require special hardware or software in the phone.

U-TDOA has been widely embraced by major U.S. GSM carriers to meet the government's E-911 requirements.

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