Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2005-05-31
2005-05-31
Mancuso, Joseph (Department: 2681)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S456100, C455S404200
Reexamination Certificate
active
06901265
ABSTRACT:
In a mobile unit housing a two-way communications subsystem and a satellite positioning system (SPS) receiver subsystem, the communications subsystem includes a training signal generator for generating a training signal mimicing a positioning signal transmitted by a remote SPS transmitter. The training signal is frequency-coupled to a reference frequency source contained within and used by the communications subsystem, which source is, itself, stabilized by means of communication with a remote station, e.g. a base station in a cellular telephone system. In a training sequence, the training signal is activated and coupled into the SPS receiver subsystem, and a replica signal generator for generating a carrier replica signal for position-fixing purposes is controlled so as to bring the carrier replica signal into aliment with the training signal. Information representative of the control setting of the replica signal generator corresponding to such alignment is stored. Subsequently in a searching sequence, the training signal is deactivated and the replica signal generator is set to a setting based on the stored information for acquisition and processing of positioning signals from remote SPS transmitters.
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Figueroa Marisol
Kilpatrick & Stockton LLP
Mancuso Joseph
Parthus (UK) Limited
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