Vehicle locating system using GPS
First Claim
1. A vehicle locating system for directing a user to a remotely-located vehicle, comprising:
- a vehicle-mounted location unit including a first global positioning receiver for receiving satellite location signals, wherein said first global positioning receiver operates at a duty cycle sufficient to maintain predetermined aiding data, wherein said vehicle-mounted location unit processes vehicle location data, and wherein said vehicle-mounted location unit further includes a first local data transceiver for transmitting said predetermined aiding data; and
a portable fob including a second global positioning receiver for receiving said satellite location signals, wherein said second global positioning receiver operates substantially only when said user initiates a request for directions to said vehicle, wherein said portable fob further includes a second local data transceiver for receiving said predetermined aiding data from said first local data transceiver when within reception range of said first local data transceiver, and wherein said portable fob processes fob location data in response to said predetermined aiding data;
wherein said fob location data is transmitted from said second local data transceiver to said first local data transceiver, wherein said vehicle-mounted location unit determines a bearing in response to said fob location data and said vehicle location data determined concurrently, and wherein said bearing is transmitted from said first local data transceiver to said second local data transceiver.
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Accused Products
Abstract
A vehicle locating system for directing a user to a remotely-located vehicle comprises a vehicle-mounted location unit and a personal fob. The vehicle-mounted location unit includes a first global positioning receiver for receiving satellite location signals which operates at a duty cycle sufficient to maintain predetermined aiding data. The vehicle-mounted location unit processes vehicle location data and further includes a first local data transceiver for transmitting the predetermined aiding data. The portable fob includes a second global positioning receiver for receiving the satellite location signals, wherein the second global positioning receiver operates substantially only when the user initiates a request for directions to the vehicle. The portable fob further includes a second local data transceiver for receiving the predetermined aiding data from the first local data transceiver. The portable fob processes fob location data in response to the predetermined aiding data.
58 Citations
20 Claims
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1. A vehicle locating system for directing a user to a remotely-located vehicle, comprising:
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a vehicle-mounted location unit including a first global positioning receiver for receiving satellite location signals, wherein said first global positioning receiver operates at a duty cycle sufficient to maintain predetermined aiding data, wherein said vehicle-mounted location unit processes vehicle location data, and wherein said vehicle-mounted location unit further includes a first local data transceiver for transmitting said predetermined aiding data; and a portable fob including a second global positioning receiver for receiving said satellite location signals, wherein said second global positioning receiver operates substantially only when said user initiates a request for directions to said vehicle, wherein said portable fob further includes a second local data transceiver for receiving said predetermined aiding data from said first local data transceiver when within reception range of said first local data transceiver, and wherein said portable fob processes fob location data in response to said predetermined aiding data; wherein said fob location data is transmitted from said second local data transceiver to said first local data transceiver, wherein said vehicle-mounted location unit determines a bearing in response to said fob location data and said vehicle location data determined concurrently, and wherein said bearing is transmitted from said first local data transceiver to said second local data transceiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of directing a user to a remotely-located vehicle, wherein said user carries a portable fob communicating with a vehicle-mounted location unit, said method comprising the steps of:
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periodically receiving GPS signals from a fleet of GPS satellites in said vehicle-mounted location unit; maintaining predetermined aiding data in said vehicle-mounted location unit in response to said GPS signals; initiating a request at said portable fob for directions to said vehicle; transmitting said predetermined aiding data to said portable fob in response to said request when said portable fob is within reception range of said vehicle-mounted location unit; receiving GPS signals from said fleet of GPS satellites in said portable fob in response to said request; said portable fob processing fob location data in response to said predetermined aiding data; transmitting said fob location data to said vehicle-mounted location unit; said vehicle-mounted location unit determining a vehicle location; said vehicle-mounted location unit determining bearing information in response to said vehicle location and said fob location data determined concurrently; transmitting said bearing information from said vehicle-mounted location unit to said portable fob; and displaying said bearing information to said user. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification