Wireless localisation system
First Claim
1. An apparatus for estimating the location of a remote node, the apparatus comprising:
- an antenna array comprising a plurality of elements in a fixed spatial arrangement, at least one element being a transmitting element configured to transmit a first wireless signal to the remote node, and at least two elements being receiving elements configured to receive a second wireless signal transmitted by the remote node in response to the first wireless signal, wherein the first wireless signal is used to measure a first time-of-arrival between the apparatus and the remote node and the second wireless signal is used to measure a second time-of-arrival between the remote node and the apparatus; and
a signal processing unit connected to the antenna array, the signal processing unit being configured to;
estimate a plurality of round trip distances using the first time-of-arrival and second time-of-arrival based on the first and second wireless signals, each round trip distance being from the transmitting element to the remote node and back to the receiving element; and
estimate the location of the remote node using the round trip distance estimates;
wherein each receiving element is configured to measure the phase of the second wireless signal relative to a common reference phase, and the signal processing unit is configured to estimate the location of the remote node using the phase measurements as well as the round trip distance estimates.
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Accused Products
Abstract
Disclosed is an apparatus for estimating the location of a remote node. The apparatus comprises an antenna array comprising a plurality of elements in a fixed spatial arrangement, at least one element being a transmitting element configured to transmit a first wireless signal to the remote node, and at least two elements being receiving elements configured to receive a second wireless signal transmitted by the remote node in response to the first wireless signal. The apparatus further comprises a signal processing unit connected to the antenna array, the signal processing unit being configured to: estimate a plurality of round trip distances using the wireless signals, each round trip distance being from a transmitting element to the remote node and back to a receiving element; and estimate the location of the remote node using the round trip distance estimates.
16 Citations
14 Claims
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1. An apparatus for estimating the location of a remote node, the apparatus comprising:
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an antenna array comprising a plurality of elements in a fixed spatial arrangement, at least one element being a transmitting element configured to transmit a first wireless signal to the remote node, and at least two elements being receiving elements configured to receive a second wireless signal transmitted by the remote node in response to the first wireless signal, wherein the first wireless signal is used to measure a first time-of-arrival between the apparatus and the remote node and the second wireless signal is used to measure a second time-of-arrival between the remote node and the apparatus; and a signal processing unit connected to the antenna array, the signal processing unit being configured to; estimate a plurality of round trip distances using the first time-of-arrival and second time-of-arrival based on the first and second wireless signals, each round trip distance being from the transmitting element to the remote node and back to the receiving element; and estimate the location of the remote node using the round trip distance estimates; wherein each receiving element is configured to measure the phase of the second wireless signal relative to a common reference phase, and the signal processing unit is configured to estimate the location of the remote node using the phase measurements as well as the round trip distance estimates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of estimating a location of a remote node, the method comprising:
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estimating a plurality of round trip distances, each round trip distance being from a transmitting element to the remote node and back to one of a plurality of receiving elements based on a first wireless signal transmitted by the transmitting element to the mobile node and a second wireless signal transmitted by the mobile node to the receiving element, wherein the first wireless signal is used to measure a first time-of-arrival between the apparatus and the remote node and the second wireless signal is used to measure a second time-of-arrival between the remote node and the apparatus; estimating the location of the remote node using the first time-of-arrival and second time-of-arrival based on the first and second wireless signals to calculate the round trip distance estimates; measuring the phase of the second wireless signal relative to a common reference phase; and estimating the location of the remote node using the phase measurements as well as the round trip distance estimates.
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Specification