Methods and apparatus for identifying asset location in communication networks
First Claim
1. A method for identifying a location of an asset in a communication network, said network having a first receiver device and a second receiver device, each receiver device having a known position, said method comprising:
- estimating more than one first time-of-arrival estimates using a correlation function, said first time-of-arrival estimates corresponding to arrival at said first station of a communication signal from said asset;
estimating more than one second time-of-arrival estimates using said correlation function, said second time-of-arrival estimates corresponding to arrival of said communication signal at said second station;
calculating more than one time-difference-of arrival corresponding to the difference in arrival of said communication signal at said first and second stations from said asset using said first and second time-of-arrival estimates; and
determining the location of the asset using said more than one time-difference-of arrival.
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Accused Products
Abstract
The location of unmodified wireless assets in a wireless communication network may be identified using time differences of arrivals of a communication sequence at different network receivers. Time-stamping devices may include correlator circuits in parallel with signal decoders to time-stamp communication sequences. Cellular wireless networks may be frequency-multiplexed to increase spatial time-stamping density. Tags may be attached to passive assets to provide location identification information to network devices. Locations of assets broadcasting standard 802.11 radio frequency structures may be identified. Noise inherent in correlating a communication sequence may be reduced by using a selected correlation function.
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Citations
10 Claims
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1. A method for identifying a location of an asset in a communication network, said network having a first receiver device and a second receiver device, each receiver device having a known position, said method comprising:
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estimating more than one first time-of-arrival estimates using a correlation function, said first time-of-arrival estimates corresponding to arrival at said first station of a communication signal from said asset; estimating more than one second time-of-arrival estimates using said correlation function, said second time-of-arrival estimates corresponding to arrival of said communication signal at said second station; calculating more than one time-difference-of arrival corresponding to the difference in arrival of said communication signal at said first and second stations from said asset using said first and second time-of-arrival estimates; and determining the location of the asset using said more than one time-difference-of arrival. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for identifying a location of an asset in a communication network, said network having a first receiver device and a second receiver device, each receiver device having a known position, said apparatus comprising:
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an estimator of more than one first time-of-arrival estimates using a correlation function, said first time-of-arrival estimates corresponding to arrival at said first station of a communication signal from said asset; an estimator of more than one second time-of-arrival estimates using said correlation function, said second time-of-arrival estimates corresponding to arrival of said communication signal at said second station; a calculator of more than one time-difference-of arrival corresponding to the difference in arrival of said communication signal at said first and second stations from said asset using said first and second time-of-arrival estimates; and means for determining the location of the asset using said more than one time-difference-of arrival. - View Dependent Claims (7, 8, 9, 10)
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Specification