Systems and methods for communication in a global...

Details Systems and methods for communication in a global... Systems and methods for communication in a global...

2004-10-08

2010-11-23

Payne, David C (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

Reexamination Certificate

active

07839916

ABSTRACT:
An apparatus and methods for communicating between or among global positioning system (GPS) receivers enhanced with wideband transmitters, which can include ultra wideband (UWB) transmitters. In one embodiment, WB pulses are precorrected by a transmitter to align with a clock common to both enhanced GPS receivers for autocorrelation, thereby simplifying WB or UWB receiver circuitry. One embodiment includes a circuit and method for adjusting the timing of a pulse by phase shifting the pulse by adjusting amplitude. The wideband pulses are used to communicate data between enhanced GPS receivers. A relatively long code can also be communicated between enhanced GPS receivers, thereby permitting the same WB signal to be used to determine range between the enhanced GPS receivers. The communicated data can include the absolute position of the enhanced GPS receiver, which when combined relative positioning from ranging data, can advantageously permit cooperatively positioning and/or navigation.

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