METHOD OF CONTROLLING A DEVICE IMPLEMENTING THE SAME

摘要

There is provided a method of controlling a device that comprises a receiver and a movement sensor, the method comprising (a) deactivating the receiver; (b) while the receiver is deactivated, analyzing measurements from the movement sensor to determine a measure of the distance the device has moved from a first location; and (c) in the event that it is determined from the measurements from the movement sensor that the device has moved from the first location by more than a threshold distance, activating the receiver and using the receiver to obtain a second measurement of the location of the device.

主权项

1. A method of controlling a device that comprises a receiver and a movement sensor, the method comprising:
(a) deactivating the receiver; (b) while the receiver is deactivated, analyzing measurements from the movement sensor to determine a measure of the distance the device has moved from a first location; and (c) in the event that it is determined from the measurements from the movement sensor that the device has moved from the first location by more than a threshold distance, activating the receiver and using the receiver to obtain a second measurement of the location of the device;
characterized in that step (b) comprises:analyzing the measurements from the movement sensor to determine the total acceleration experienced by the device at a particular sampling instant; andaccumulating the determined total acceleration at the particular sampling instant with the total acceleration determined for each preceding sampling instant following the sampling instant at which the first location was determined; and wherein step (c) comprises:
comparing the accumulated total acceleration to a threshold; anddetermining that the device has moved from the first location by more than a threshold distance if the accumulated total acceleration exceeds the threshold.