Device for monitoring and measuring distance
First Claim
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1. A device for monitoring distance comprising:
- an interrogator;
a transponder in wireless communication with the interrogator, the transponder having a signaling device;
the interrogator having a microprocessor that determines distance between the interrogator and the transponder; and
the interrogator sending a command signal to the transponder that activates the signaling device when the determined distance nears a pre-determined distance;
wherein the interrogator sends an encoded signal to the transponder and determines the distance to the transponder based on the phase delay of the transponder'"'"'s response;
wherein a digital spreading sequence is used with the interrogator to derive a distance measurement.
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Abstract
A device for monitoring distances having an interrogator and a transponder in wireless communication with the interrogator, the transponder having a signaling device that is activated based on the distance between the interrogator and transponders. The interrogator sends an encoded signal to the transponder and determines the distance to the transponder based on the delay of the transponder'"'"'s response. The interrogator instructs the transponder to activate a signaling device when the distance exceeds a predetermined setting. The present invention is directed towards applications that require one-foot precision and accuracy.
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4 Claims
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1. A device for monitoring distance comprising:
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an interrogator; a transponder in wireless communication with the interrogator, the transponder having a signaling device; the interrogator having a microprocessor that determines distance between the interrogator and the transponder; and the interrogator sending a command signal to the transponder that activates the signaling device when the determined distance nears a pre-determined distance; wherein the interrogator sends an encoded signal to the transponder and determines the distance to the transponder based on the phase delay of the transponder'"'"'s response; wherein a digital spreading sequence is used with the interrogator to derive a distance measurement. - View Dependent Claims (2, 3, 4)
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Specification
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Current AssigneeEverest A. Wallace, Mark A. Voves, Mark B. Godfrey
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Original AssigneeEverest A. Wallace, Mark A. Voves, Mark B. Godfrey
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InventorsEverest, A. Wallace, Voves, Mark A., Godfrey, Mark B.
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Primary Examiner(s)Lieu; Julie
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Application NumberUS11/044,104Publication NumberTime in Patent Office1,230 DaysField of SearchNoneUS Class Current340/573.1CPC Class CodesA01K 15/023 Anti-evasion devicesG08B 21/0202 Child monitoring systems us...
