Vehicle navigation system with improved powerup performance
First Claim
1. A GPS receiver storing satellite ephemeris data, said GPS receiver having a low power mode and a full power mode, said GPS receiver switching from low power mode to full power mode and collecting and storing fresh satellite ephemeris data if a predetermined time has elapsed since said satellite ephemeris data was stored.
8 Assignments
0 Petitions
Accused Products
Abstract
A navigation system includes a driver presence sensor and engine running detection circuitry. When the detection circuitry determines that the engine of the vehicle is not running, the navigation system enters a low power mode. When the presence of the driver is detected, the navigation system begins power up, switching from a low power to a full power operational mode. If the detection circuitry does not determine that the engine is running within a predetermined time period, the navigation system reenters the low power mode. The detection circuitry monitors the vehicle'"'"'s electrical system and determines that the engine is running when an AC content exceeds a predetermined threshold.
73 Citations
13 Claims
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1. A GPS receiver storing satellite ephemeris data, said GPS receiver having a low power mode and a full power mode, said GPS receiver switching from low power mode to full power mode and collecting and storing fresh satellite ephemeris data if a predetermined time has elapsed since said satellite ephemeris data was stored.
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2. A method for operating a navigation system for a vehicle including the steps of:
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a. maintaining an electrical component of a navigation system in a low power mode when the navigation system is not being utilized and an engine in the vehicle is not running; b. predicting when said navigation system will be utilized; c. generating a warmup signal based upon said prediction; and d. switching said electrical component from said low power mode to an operating mode based upon said warmup signal, said steps b-d being performed prior to the engine in the vehicle running. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification