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公开(公告)号：US20190128673A1
公开(公告)日：2019-05-02
申请号：US15894841
申请日：2018-02-12
Applicant: Focal Point Positioning Limited
Inventor： Ramsey Faragher , Mark Crockett , Peter Duffett-Smith
Abstract: A method and system for combining data obtained by sensors, having particular application in the field of navigation systems, are disclosed. The techniques provide significant improvement over state-of-the-art Markovian methods that use statistical noise filters such as Kalman filters to filter data by comparing instantaneous data with the corresponding instantaneous estimates from a model. In contrast, the techniques disclosed herein use multiple time periods of various lengths to process multiple sensor data streams, in order to combine sensor measurements with motion models at a given time epoch with greater confidence and accuracy than is possible with traditional “single epoch” methods. The techniques provide particular benefit when the first and/or second sensors are low-cost sensors (for example as seen in smart phones) which are typically of low quality and have large inherent biases.
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公开(公告)号：US12135380B2
公开(公告)日：2024-11-05
申请号：US17950921
申请日：2022-09-22
Applicant: Focal Point Positioning Limited
Inventor： Ramsey Faragher , Nicolas Couronneau , Robert Mark Crockett
Abstract: A method for performing in a positioning, navigation, tracking, frequency-measuring, or timing system is provided. The method comprises: providing first and second estimates of at least one system parameter during a first time period, wherein the at least one system parameter has a true value and/or true evolution over time during the first time period; providing a local signal; receiving, at a receiver, a signal from a remote source; providing a correlation signal by correlating the local signal with the received signal; providing amplitude and/or phase compensation of at least one of the local signal, the received signal and the correlation signal based on each of the first and second estimates so as to provide first and second amplitude-compensated and/or phase-compensated correlation signals corresponding to the first and second estimates of the at least one system parameter during the first time period, and; determining which of the first and second estimates is nearer the true value and/or true evolution over time of the at least one system parameter during the first time period, based on a comparison between the first and second amplitude-compensated and/or phase-compensated correlation signals. A computer readable medium and system are also disclosed.
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公开(公告)号：US20240133992A1
公开(公告)日：2024-04-25
申请号：US18381071
申请日：2023-10-16
Applicant: Focal Point Positioning Limited
CPC classification number: G01S5/021 , G01S5/10 , G01S2205/008
Abstract: A method, apparatus and system for determining a location of a receiver using cellular signals include determining a motion of a respective antenna of at least one receiver that received at least one cellular signal, using the determined antenna motion, performing motion compensated correlation on the received at least one cellular signal to generate at least one motion compensated correlation result, determining a direction of arrival for the received at least one cellular signal using the at least one motion compensated correlation result, and determining a location of the at least one receiver using the determined direction of arrival of the received at least one cellular signal and location information related to the at least one emitter from which the at least one cellular signal was received.
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14.发明申请公开(公告)号：US20230009945A1
公开(公告)日：2023-01-12
申请号：US17947911
申请日：2022-09-19
Applicant: Focal Point Positioning Limited
Abstract: A method and apparatus for improving signal reception in a radio signal receiver is provided. The method comprises: receiving a signal from one or more remote sources; determining movement of the receiver; obtaining first and second phasor sequences indicative of the determined movement of the receiver in first and second directions; generating a third phasor sequence based on a weighted combination of the first and second phasor sequences in accordance with the first and second directions; and providing a correlation signal using the third phasor sequence, wherein providing the correlation signal comprises correlating a local signal with the received signal, and combining at least one of the local signal, received signal, and the result of the correlation with the third phasor sequence, such that a signal received along the second direction is suppressed relative to a signal received along the first direction. A corresponding positioning system is also disclosed.
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15.发明授权公开(公告)号：US10816672B2
公开(公告)日：2020-10-27
申请号：US15822475
申请日：2017-11-27
Applicant: Focal Point Positioning Limited
Inventor： Ramsey Faragher , Nicolas Couronneau , Robert Mark Crockett , Peter Duffett-Smith
Abstract: A positioning device (4) is disclosed comprising at least one antenna (14, 16) for receiving ranging signals, such as GNSS signals. The device comprises a local oscillator (18) for providing a local frequency or phase reference and an inertial sensor (22) for measuring a movement of the device. A processor (36) is provided for performing calculations. The device can receive a first reference signal at a known or predictable frequency or phase. A local oscillator offset determination module (26) is provided to calculate an offset to the received frequency or the received phase based on the movement of the receiver in the direction of the first reference source. A local signal generator (28) can then use the local frequency or phase reference from the local oscillator (18), and the offset calculated by the local oscillator offset determination module (26), to provide a local signal using a local signal generator (28). The local signal can be correlated against a received ranging signal for use in positioning calculations performed by a positioning calculator (34).
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Patent Agency Ranking
公开(公告)号：US20200264317A1
公开(公告)日：2020-08-20
申请号：US16823973
申请日：2020-03-19
Applicant: Focal Point Positioning Limited
Inventor： Ramsey Faragher , Nicolas Couronneau , Robert Mark Crockett
Abstract: A method for performing in a positioning, navigation, tracking, frequency-measuring, or timing system is provided. The method comprises: providing first and second estimates of at least one system parameter during a first time period, wherein the at least one system parameter has a true value and/or true evolution over time during the first time period; providing a local signal; receiving, at a receiver, a signal from a remote source; providing a correlation signal by correlating the local signal with the received signal; providing amplitude and/or phase compensation of at least one of the local signal, the received signal and the correlation signal based on each of the first and second estimates so as to provide first and second amplitude-compensated and/or phase-compensated correlation signals corresponding to the first and second estimates of the at least one system parameter during the first time period, and; determining which of the first and second estimates is nearer the true value and/or true evolution over time of the at least one system parameter during the first time period, based on a comparison between the first and second amplitude-compensated and/or phase-compensated correlation signals. A computer readable medium and system are also disclosed.
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17.发明申请公开(公告)号：US20190011569A1
公开(公告)日：2019-01-10
申请号：US15822475
申请日：2017-11-27
Applicant: Focal Point Positioning Limited
Inventor： Ramsey Faragher , Nicolas Couronneau , Robert Mark Crockett , Peter Duffett-Smith
Abstract: A positioning device (4) is disclosed comprising at least one antenna (14, 16) for receiving ranging signals, such as GNSS signals. The device comprises a local oscillator (18) for providing a local frequency or phase reference and an inertial sensor (22) for measuring a movement of the device. A processor (36) is provided for performing calculations. The device can receive a first reference signal at a known or predictable frequency or phase. A local oscillator offset determination module (26) is provided to calculate an offset to the received frequency or the received phase based on the movement of the receiver in the direction of the first reference source. A local signal generator (28) can then use the local frequency or phase reference from the local oscillator (18), and the offset calculated by the local oscillator offset determination module (26), to provide a local signal using a local signal generator (28). The local signal can be correlated against a received ranging signal for use in positioning calculations performed by a positioning calculator (34).
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公开(公告)号：US20240195460A1
公开(公告)日：2024-06-13
申请号：US18524022
申请日：2023-11-30
Applicant: Focal Point Positioning Limited
IPC: H04B7/0426 , H04B7/06 , H04L5/00
CPC classification number: H04B7/043 , H04B7/0617 , H04L5/0048
Abstract: A method and apparatus for performing direction division multiple access. In some embodiments, the method includes: performing motion compensated correlation upon a received signal transmitted from a transceiver to generate at least one motion compensated correlation result; identifying a direction of arrival for the received signal using the at least one motion compensated correlation result; and selecting, using the direction of arrival of the received signal, to communicate with the transceiver.
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公开(公告)号：US20240103118A1
公开(公告)日：2024-03-28
申请号：US18371915
申请日：2023-09-22
Applicant: Focal Point Positioning Limited
IPC: G01S5/02
CPC classification number: G01S5/0273
Abstract: A method for mapping a surface using signals transmitted from a single transmitter comprises: receiving signals transmitted from the single transmitter, where each signal has a different propagation path; determining a motion of an antenna of the receiver; generating phasor sequences, where each phasor sequence represents a hypothesis based on antenna motion and a direction of arrival estimate for each received signal; compensating the received signals, local signals, or correlation results from correlating the received signals with the local signals using the phasor sequences based on the hypotheses to generate compensated correlation results; determining a preferred hypothesis in the hypotheses for each received signal that optimizes each correlation result; identifying a direction of arrival for each received signal using the determined hypothesis; determining a point of reflection from the direction of arrival of each received signal; and combining the points of reflection into one or more reflective surfaces.
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20.发明公开公开(公告)号：US20240019527A1
公开(公告)日：2024-01-18
申请号：US18222642
申请日：2023-07-17
Applicant: FOCAL POINT POSITIONING LIMITED
CPC classification number: G01S5/0242 , G01S13/582 , G01S3/023 , G01S5/017
Abstract: A method, apparatus and system for providing a position of a receiver using signals transmitted from a single transmitter include receiving a plurality of signals transmitted from the single transmitter, determining a motion of an antenna of the receiver, generating a plurality of phasors sequences, compensating the received signals, a plurality of local signals or correlation results from correlating the received signals with the local signals using the plurality of phasor sequences based on the plurality of hypotheses regarding the receiver motion and the direction of arrival to generate a plurality of compensated correlation results, determining a preferred hypothesis in the plurality of hypotheses for each received signal that optimizes each correlation result, identifying a direction of arrival for the plurality of received signals using the preferred hypothesis, and determining a position of the receiver using the direction of arrival of each received signal in the plurality of received signals.
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