GPS satellite signal acquisition assistance system and method in a wireless communications network
First Claim
1. A system for transmitting a GPS receiver code-phase search range to a integrated GPS/wireless terminal unit operating in a wireless network, said system comprising:
- a receiver operable to generate a GPS time reference;
a controller operable to calculate a GPS code-phase search range with reference to a base station geographic location, the wireless coverage area, said GPS time reference and the estimated wireless signal propagation delay within said coverage area, and a transmitter coupled to said controller and operable to transmit said calculated GPS code search range.
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Accused Products
Abstract
A system and method for assisting an integrated GPS/wireless terminal unit in acquiring one or more GPS satellite signals from the GPS satellite constellation. The invention includes a method for narrowing the PN-code phase search. That is, by accounting for the variables in geographic location and time delay relative to GPS time, the systems and methods of the present invention generate a narrow code-phase search range that enables the terminal unit to more quickly acquire and track the necessary GPS satellites, and thereby more quickly provide accurate position information to a requesting entity.
88 Citations
16 Claims
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1. A system for transmitting a GPS receiver code-phase search range to a integrated GPS/wireless terminal unit operating in a wireless network, said system comprising:
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a receiver operable to generate a GPS time reference;
a controller operable to calculate a GPS code-phase search range with reference to a base station geographic location, the wireless coverage area, said GPS time reference and the estimated wireless signal propagation delay within said coverage area, and a transmitter coupled to said controller and operable to transmit said calculated GPS code search range. - View Dependent Claims (2)
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3. A system for transmitting a GPS receiver code-phase search range to a integrated GPS/wireless terminal unit operating in a wireless network, comprising:
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a GPS receiver operable to generate a GPS time reference;
means for obtaining a time offset for the GPS/wireless terminal unit relative to said GPS time reference;
a controller operable to calculate a GPS code-phase search range with reference to a base station geographic location, the wireless coverage area, and said time reference; and
a transmitter coupled to said controller and operable to transmit said calculated GPS code search range. - View Dependent Claims (4, 5)
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6. A system for transmitting a GPS receiver code-phase search range to a integrated GPS/wireless terminal unit operating in a wireless network, comprising:
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a GPS receiver operable to generate a GPS time reference;
means for obtaining a time offset for the GPS/wireless terminal unit relative to said GPS time reference;
means for obtaining a location reference for the GPS/wireless terminal unit;
a controller operable to calculate a GPS code-phase search range with reference to said location reference, and said time reference; and
a transmitter coupled to said controller and operable to transmit said calculated GPS code search range. - View Dependent Claims (7, 8)
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9. A method for defining a GPS receiver code-phase search range for an integrated GPS/wireless terminal unit operating in a wireless network having a base station, comprising the steps of:
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calculating a GPS code-phase search range with reference to the base station geographic location plus the wireless coverage area, and with reference to a base station GPS time reference plus the estimated wireless signal propagation delay within said coverage area and transmitting said calculated GPS code-phase search range. - View Dependent Claims (10)
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11. A method for defining a GPS receiver code-phase search range for an integrated GPS/wireless terminal unit operating in a wireless network having a base station, comprising the steps of:
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obtaining a time reference for the GPS/wireless terminal unit establishing the time offset relative to the base station GPS time;
calculating a GPS code-phase search range with reference to the base station geographic location plus the wireless coverage area, and said time reference; and
transmitting said calculated GPS code-phase search range. - View Dependent Claims (12, 13, 15, 16)
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14. A method for defining a GPS receiver code-phase search range for an integrated GPS/wireless terminal unit operating in a wireless network having a base station, comprising the steps of:
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obtaining a time reference for the GPS/wireless terminal unit establishing the time offset relative to the base station GPS time;
obtaining a location reference for the GPS/wireless terminal unit;
calculating a GPS code-phase search range with reference to said location reference, and said time reference; and
transmitting said calculated GPS code-phase search range by the base station.
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Specification