Performance of a Navigation Receiver Operating in a Power-Save Mode with the Aid of Sensors
First Claim
1. A method for controlling a navigation device, comprising:
- identifying a current position using a navigation receiver;
determining when the navigation receiver may enter a power-save mode;
placing the navigation receiver in a power-save mode;
while in the power-save mode, updating the current position using information from one or more position sensors;
controlling when the navigation receiver is enabled to determine an intermediate position; and
using the intermediate position to update the current position;
determining when the navigation receiver should exit the power-save mode; and
placing the navigation receiver in an active mode.
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Accused Products
Abstract
A system and method for controlling a navigation receiver is disclosed. A current position is determined using the navigation receiver and then the navigation receiver is placed in a power-save mode. The current position is updated using information from position sensors. The navigation receiver is temporarily placed in an active mode at intervals to determine an intermediate position. The current position is also updated using the intermediate position. The navigation receiver may be a GNSS receiver, a cellular receiver, a WiFi receiver, or another position-fixing device. The position sensors may be accelerometers, gyroscopes, electronic compasses or mapping data. A power-save controller controls the power-save or active mode of the navigation receiver. A sensor conditioning circuit pre-processes the data from the position sensors before providing the data to the power-save controller. During the power-save mode, an RF subsystem and/or a baseband subsystem of the navigation receiver may be turned off.
84 Citations
30 Claims
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1. A method for controlling a navigation device, comprising:
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identifying a current position using a navigation receiver; determining when the navigation receiver may enter a power-save mode; placing the navigation receiver in a power-save mode; while in the power-save mode, updating the current position using information from one or more position sensors; controlling when the navigation receiver is enabled to determine an intermediate position; and using the intermediate position to update the current position; determining when the navigation receiver should exit the power-save mode; and placing the navigation receiver in an active mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A system comprising:
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a navigation receiver comprising a radio frequency (RF) subsystem and a baseband subsystem; one or more position sensors; and a power-save controller coupled to the navigation receiver and to the one or more position sensors, the power-save controller controlling a power-save mode for the navigation receiver based upon data from the one or more position sensors. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method for controlling a navigation receiver, comprising:
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determining a current position; receiving data from position sensors; placing the navigation receiver in a power-save mode; determining an update rate for the navigation receiver; updating the current position using the data from the position sensors; placing the navigation receiver temporarily in an active mode at update intervals to determine an intermediate position; and updating the current position using intermediate position data.
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Specification