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1.发明授权公开(公告)号：US10989531B2
公开(公告)日：2021-04-27
申请号：US15503913
申请日：2015-08-12
Inventor： Mark Hedley , Dan Popescu
Abstract: Described herein is a method of setting-up a range-based tracking system utilising a tracking coordinate system that uses a plurality of spaced apart stationary nodes for tracking objects within a tracking environment. The method includes the step of transmitting signals between the stationary nodes to obtain range information between at least a subset of pairs of the nodes and determining coordinates for all of the stationary nodes in a node coordinate system using these range information. The method also includes the step of obtaining spatial information related to at least one of the nodes, the spatial information being indicative of one or more features or locations within the tracking environment and determining the location of all stationary nodes in the tracking coordinate system, wherein some or all of the coordinates of the stationary nodes are used for tracking objects in the tracking system.
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公开(公告)号：US10440678B2
公开(公告)日：2019-10-08
申请号：US16084841
申请日：2017-03-10
Inventor： Mark Hedley , Shenghong Li
Abstract: A wireless tracking system comprises mobile devices and stationary devices at known locations. The system receives a first radio measurement indicative of a first propagation path length and receives sensor data indicative of the movement of the first mobile device. The sensor data is of a type different to the radio measurement. The system then determines a historical location of the first mobile device based on the first radio measurement and the sensor data and determines error data indicative of a difference between a historical radio measurement and the historical location and stores the error data associated with the historical location. The system can then receive a second radio measurement indicative of a second propagation path length of radio frequency radiation and determine an estimated location of the second mobile device based on the second radio measurement and the stored error data.
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公开(公告)号：US20190104493A1
公开(公告)日：2019-04-04
申请号：US16084841
申请日：2017-03-10
Inventor： Mark Hedley , Shenghong Li
CPC classification number: H04W64/003 , G01S5/00 , G01S5/02 , G01S5/0205 , G01S5/0263 , G01S5/0273 , G01S5/0294 , H04W4/027 , H04W4/029 , H04W4/33 , H04W24/10 , H04W64/00
Abstract: A wireless tracking system comprises mobile devices and stationary devices at known locations. The system receives a first radio measurement indicative of a first propagation path length and receives sensor data indicative of the movement of the first mobile device. The sensor data is of a type different to the radio measurement. The system then determines a historical location of the first mobile device based on the first radio measurement and the sensor data and determines error data indicative of a difference between a historical radio measurement and the historical location and stores the error data associated with the historical location. The system can then receive a second radio measurement indicative of a second propagation path length of radio frequency radiation and determine an estimated location of the second mobile device based on the second radio measurement and the stored error data.
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Patent Agency Ranking
公开(公告)号：US20150094086A1
公开(公告)日：2015-04-02
申请号：US14399506
申请日：2013-05-07
Inventor： Mark Hedley
IPC: G01S5/06
CPC classification number: G01S5/06 , G01S5/0215 , G01S5/0221 , G01S5/0278
Abstract: This disclosure concerns estimating the location of a transmitter using multiple pairs of locator nodes with known locations and measuring time of arrival of a signal received from a transmitter. A processor of a location estimation node first determines time difference of arrival values from time of arrival values measured by each pair of locator nodes. The processor then determines likelihood information for multiple candidate locations of the transmitter and estimates the location of the transmitter from the likelihood information. A processor further determines an initial time of arrival value for the received signal and channel impulse response for a radio channel between the transmitter and receiver. The processor then determines a time correction from the channel impulse response based on a first peak of the channel impulse response and a leading edge of the first value. The processor finally determines an improved time of arrival value of the received signal.
Abstract translation: 本公开涉及使用具有已知位置的多对定位器节点估计发射机的位置并且测量从发射机接收的信号的到达时间。 位置估计节点的处理器首先确定由每对定位器节点测量的到达时间值的时间差值。 然后，处理器确定发射机的多个候选位置的似然信息，并根据似然信息估计发射机的位置。 处理器还确定接收信号的初始到达时间值和发射机与接收机之间的无线电信道的信道脉冲响应。 然后处理器基于信道脉冲响应的第一峰值和第一值的前沿确定来自信道脉冲响应的时间校正。 处理器最终确定接收信号的改进的到达时间值。
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公开(公告)号：US11061106B2
公开(公告)日：2021-07-13
申请号：US16454841
申请日：2019-06-27
Inventor： Mark Hedley , David Eric Humphrey
Abstract: Disclosed is method of computing a round trip delay between a pair of nodes, the method comprising transmitting at least one beacon at a known transmit time from each of the nodes; measuring the times-of-arrival of the beacons at other of the nodes; and estimating a round trip delay between the nodes from the measured times-of-arrival and the transmit times; and correcting the round trip delay for either or both of a frequency offset between the nodes and relative motion between the nodes.
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公开(公告)号：US09726751B2
公开(公告)日：2017-08-08
申请号：US14399506
申请日：2013-05-07
Inventor： Mark Hedley
CPC classification number: G01S5/06 , G01S5/0215 , G01S5/0221 , G01S5/0278
Abstract: This disclosure concerns estimating the location of a transmitter using multiple pairs of locator nodes with known locations and measuring time of arrival of a signal received from a transmitter. A processor of a location estimation node first determines time difference of arrival values from time of arrival values measured by each pair of locator nodes. The processor then determines likelihood information for multiple candidate locations of the transmitter and estimates the location of the transmitter from the likelihood information. A processor further determines an initial time of arrival value for the received signal and channel impulse response for a radio channel between the transmitter and receiver. The processor then determines a time correction from the channel impulse response based on a first peak of the channel impulse response and a leading edge of the first value. The processor finally determines an improved time of arrival value of the received signal.
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公开(公告)号：US20190317184A1
公开(公告)日：2019-10-17
申请号：US16454841
申请日：2019-06-27
Inventor： Mark Hedley , David Eric Humphrey
Abstract: Disclosed is method of computing a round trip delay between a pair of nodes, the method comprising transmitting at least one beacon at a known transmit time from each of the nodes; measuring the times-of-arrival of the beacons at other of the nodes; and estimating a round trip delay between the nodes from the measured times-of-arrival and the transmit times; and correcting the round trip delay for either or both of a frequency offset between the nodes and relative motion between the nodes.
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公开(公告)号：US10338194B2
公开(公告)日：2019-07-02
申请号：US15255011
申请日：2016-09-01
Inventor： Mark Hedley , David Eric Humphrey
Abstract: Disclosed is method of computing a round trip delay between a pair of nodes, the method comprising transmitting at least one beacon at a known transmit time from each of the nodes; measuring the times-of-arrival of the beacons at other of the nodes; and estimating a round trip delay between the nodes from the measured times-of-arrival and the transmit times; and correcting the round trip delay for either or both of a frequency offset between the nodes and relative motion between the nodes.
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