Enhanced GPS receiver utilizing wireless infrastructure

Telecommunications – Transmitter and receiver at separate stations – With control signal

Reexamination Certificate

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Details

C455S012100, C455S013200, C455S427000, C455S067160, C455S456100, C455S255000, C342S357490, C342S352000, C342S357490, C342S357490

Reexamination Certificate

active

06839547

ABSTRACT:
A locator using Navstar constellation signals for determining geographical location of a mobile receiver. The locator is integrated with a mobile unit of a cellular network, which derives its reference frequency from a local oscillator (26). A frequency measuring module (28) counts the number of digital numbers derived from the local oscillator passing between two consecutive time-tagged indicators of the cellular network. The estimated frequency is calculated by dividing the number of digital numbers by the nominal time interval (T0) between the indicators.

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