Geo-fence with minimal false alarms
First Claim
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1. A method of tracking movement of a wireless location device relative to a predefined geographic boundary, comprising:
- receiving a position fix and error data defining an error zone around the position fix;
determining a distance between the position fix and a zone boundary edge;
determining a zone alert confidence threshold as a function of the distance between the position fix and the zone boundary edge, the geographic boundary circle radius, and the error data;
determining that the zone alert confidence threshold meets a predefined level; and
providing notification that the device has crossed the predefined geographical boundary.
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Abstract
A method and apparatus is disclosed for a wireless device locator system and determining whether a device has entered or exited a two dimensional geographic zone area and alerting the device user when the device has entered or exited the zone. The method and apparatus may further minimize the probability of false zone entry and exit zone area alerts to wireless tracking device users.
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Citations
22 Claims
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1. A method of tracking movement of a wireless location device relative to a predefined geographic boundary, comprising:
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receiving a position fix and error data defining an error zone around the position fix; determining a distance between the position fix and a zone boundary edge; determining a zone alert confidence threshold as a function of the distance between the position fix and the zone boundary edge, the geographic boundary circle radius, and the error data; determining that the zone alert confidence threshold meets a predefined level; and providing notification that the device has crossed the predefined geographical boundary. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of tracking movement of a wireless location device relative to a predefined geographic boundary, comprising:
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receiving indication that the wireless location device has crossed the predefined geographical boundary; receiving from the device at least two consecutive measurements of positioning data and associated positioning data accuracies; determining that the positioning data accuracies meet a predefined level; and providing notification that the device has crossed the predefined geographical boundary when the positioning data accuracies meet the predefined level.
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17. A computing system adapted to track movement of a wireless location device relative to a predefined geographical boundary, comprising:
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a server; and computing memory communicatively coupled to said server, the computing memory having stored therein a software application adapted to perform the following; define a two dimensional geographic zone area corresponding to said predefined geographical boundary; implement a timer for periodically commanding at least one positioning wireless location device to wake up from a sleep mode; request a position fix from said at least one wireless location device when the device reports an accuracy that meets an accuracy threshold; and wirelessly send an alert when the device has crossed the predefined geographical boundary. - View Dependent Claims (18, 19)
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20. A wireless location determination device for tracking movement relative to a predefined geographic boundary, the device configured to:
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periodically request a position fix and associated position fix error based on a predetermined timer value; and transmit an alert via a wireless network when the device has crossed the predefined geographic boundary. - View Dependent Claims (21, 22)
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Specification