Location of cooperative tags with personal electronic device
First Claim
1. A method for determining the relative position of a cooperative transponder by the use of a software defined radio transceiver in a personal electronic device, wherein the primary function of the software defined radio set is that of a cellular telephone, the method comprising:
- receiving a user initiated input that is indicative of a mode selection to a locator mode in the personal electronic device;
executing a radio set configuration logic with a processor in the personal electronic device such that the processor reconfigures the software defined radio transceiver from a cellular telephone mode to a locator mode, wherein the software defined radio set and the processor in the personal electronic device are arranged to operate the locator mode by;
selecting a target ID associated with the cooperative transponder;
coding a sequence for the selected target ID;
initiating the transmission of a structured multi-frame transmission to the cooperative transponder over a first time interval with the software defined radio set;
capturing sample of a signal spectrum over a second time interval that is subsequent to the first time with the software defined radio set;
correlating the captured samples over a third time interval with the software defined radio set;
detecting a valid reply from the cooperative transponder device when the captured samples correlate to a structured reply transmission from the cooperative transponder with a reply cadence and frequency that substantially matches the expected reply cadence and frequency based on the internal clock of the personal electronic device; and
determining a round-trip time-of-flight between the transmission of the structure multi-frame transmission and the detected valid reply.
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Accused Products
Abstract
The present disclosure relates to location and communication systems that can be utilized for locating people, pets and other objects with a software defined radio set. A personal electronic device (PED) such as a cellular telephone, personal data assistant (PDA) or other device that include a software defined radio set can be configured for operation as a locator device. The PED transmits a signal A transponder or micro-transponder (MT) that is tagged to an object is arranged to reply to a transmission received from the PED. The PED based locator is arranged to calculate a distance between the PED and the MT using the time-of-flight (TOF) between the transmission and the receipt of a reply. The absolute geographic position of the PED can be determined using satellite navigation information, while the position of the MT relative to the PED can be determined from the TOF information.
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Citations
14 Claims
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1. A method for determining the relative position of a cooperative transponder by the use of a software defined radio transceiver in a personal electronic device, wherein the primary function of the software defined radio set is that of a cellular telephone, the method comprising:
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receiving a user initiated input that is indicative of a mode selection to a locator mode in the personal electronic device; executing a radio set configuration logic with a processor in the personal electronic device such that the processor reconfigures the software defined radio transceiver from a cellular telephone mode to a locator mode, wherein the software defined radio set and the processor in the personal electronic device are arranged to operate the locator mode by; selecting a target ID associated with the cooperative transponder; coding a sequence for the selected target ID; initiating the transmission of a structured multi-frame transmission to the cooperative transponder over a first time interval with the software defined radio set; capturing sample of a signal spectrum over a second time interval that is subsequent to the first time with the software defined radio set; correlating the captured samples over a third time interval with the software defined radio set; detecting a valid reply from the cooperative transponder device when the captured samples correlate to a structured reply transmission from the cooperative transponder with a reply cadence and frequency that substantially matches the expected reply cadence and frequency based on the internal clock of the personal electronic device; and determining a round-trip time-of-flight between the transmission of the structure multi-frame transmission and the detected valid reply. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification