System and method for tracking and locating a person, animal, or machine
First Claim
1. A method for performing a carrier phase difference measurement comprising:
- transmitting a first wireless signal from a first originator antenna of an originator device to a first transponder antenna and a second transponder antenna of a transponder device, the first transponder antenna and the second transponder antenna having a known relative separation;
receiving said first wireless signal at said first transponder antenna and said second transponder antenna; and
calculating a first differential distance, based on said first wireless signal received at said first transponder antenna and said second transponder antenna,wherein said first differential distance is the difference between a first distance and a second distance,wherein said first distance is the distance between the first originator antenna and said first transponder antenna, andwherein said second distance is the distance between said first originator antenna and said second transponder antenna.
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Accused Products
Abstract
A system and method for estimating the position of an object, such as a person, animal, or machine. The system includes first and second inertial measurement units, a first and second originator antennas, and a first and second transponder antennas. The system uses data from the inertial measurement units to estimate a position of the object. The system also calculates a range measurement between the first originator antenna and first transponder antenna. The system calculates a first CPD measurement between the second transponder antenna and the first originator antenna, and a second CPD measurement between the second originator antenna and the first transponder antenna. The range measurement and at least one CPD measurement are used to update a Kalman filter for estimating the position of the object. The system determines also updates the Kalman filter when one of the inertial measurement units is in a zero-velocity condition.
37 Citations
14 Claims
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1. A method for performing a carrier phase difference measurement comprising:
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transmitting a first wireless signal from a first originator antenna of an originator device to a first transponder antenna and a second transponder antenna of a transponder device, the first transponder antenna and the second transponder antenna having a known relative separation; receiving said first wireless signal at said first transponder antenna and said second transponder antenna; and calculating a first differential distance, based on said first wireless signal received at said first transponder antenna and said second transponder antenna, wherein said first differential distance is the difference between a first distance and a second distance, wherein said first distance is the distance between the first originator antenna and said first transponder antenna, and wherein said second distance is the distance between said first originator antenna and said second transponder antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for performing a carrier phase difference measurement comprising:
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a transponder device comprising a first transponder antenna configured to receive a first wireless signal from a first originator antenna of an originator device, and a second transponder antenna configured to receive the first wireless signal from the first originator antenna, the first transponder antenna and the second transponder antenna having a known relative separation; a processor; and a memory storing instructions that, when executed on the processor, perform the step of calculating a first differential distance based on the first wireless signal received at the first transponder antenna and the second transponder antenna, wherein the first differential distance is the difference between a first distance and a second distance, the first distance being the distance between the first originator antenna and the first transponder antenna, and the second distance being the distance between the first originator antenna and the second transponder antenna. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification