Patents by Inventor Peter Duffett-Smith
Peter Duffett-Smith has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240027194Abstract: 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.Type: ApplicationFiled: October 6, 2023Publication date: January 25, 2024Inventors: Ramsey FARAGHER, Mark Crockett, Peter Duffett-Smith
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Patent number: 11815355Abstract: 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.Type: GrantFiled: May 10, 2021Date of Patent: November 14, 2023Assignee: Focal Point Positioning LimitedInventors: Ramsey Faragher, Mark Crockett, Peter Duffett-Smith
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Publication number: 20230168385Abstract: A system is disclosed for determining a physical metric such as position. The system comprises a local signal generator (8) configured to provide a local signal and a receiver (4) configured to receive a signal having properties corresponding to those in a signal transmitted by a trusted remote source. An inertial measurement unit (12) is configured to provide a measured or assumed movement of the receiver. A correlator (6) is configured to provide a correlation signal by correlating the local signal with the received signal. A motion compensation unit (14) is configured to provide motion compensation of at least one of the local signal, the received signal, and the correlation signal based on the measured or assumed movement.Type: ApplicationFiled: January 31, 2023Publication date: June 1, 2023Inventors: Ramsey FARAGHER, Robert Mark CROCKETT, Peter DUFFETT-SMITH, Nicolas COURONNEAU
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Publication number: 20220404509Abstract: A system is disclosed for determining a physical metric such as position. The system comprises a local signal generator (8) configured to provide a local signal and a receiver (4) configured to receive a signal having properties corresponding to those in a signal transmitted by a trusted remote source. An inertial measurement unit (12) is configured to provide a measured or assumed movement of the receiver. A correlator (6) is configured to provide a correlation signal by correlating the local signal with the received signal. A motion compensation unit (14) is configured to provide motion compensation of at least one of the local signal, the received signal, and the correlation signal based on the measured or assumed movement.Type: ApplicationFiled: August 22, 2022Publication date: December 22, 2022Inventors: Ramsey FARAGHER, Robert Mark Crockett, Peter Duffett-Smith, Nicolas Couronneau
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Patent number: 11474258Abstract: A system is disclosed for determining a physical metric such as position. The system comprises a local signal generator (8) configured to provide a local signal and a receiver (4) configured to receive a signal having properties corresponding to those in a signal transmitted by a trusted remote source. An inertial measurement unit (12) is configured to provide a measured or assumed movement of the receiver. A correlator (6) is configured to provide a correlation signal by correlating the local signal with the received signal. A motion compensation unit (14) is configured to provide motion compensation of at least one of the local signal, the received signal, and the correlation signal based on the measured or assumed movement.Type: GrantFiled: March 19, 2020Date of Patent: October 18, 2022Assignee: Focal Point Positioning LimitedInventors: Ramsey Faragher, Robert Mark Crockett, Peter Duffett-Smith, Nicolas Couronneau
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Patent number: 11137500Abstract: A method, apparatus, computer program, data structure, signal relating to: causing correlation of a digital signal provided by a receiver with a motion-compensated correlation code, wherein the motion-compensated correlation code is a correlation code that has been compensated before correlation using one or more phasors dependent upon an assumed or measured movement of the receiver.Type: GrantFiled: March 21, 2017Date of Patent: October 5, 2021Assignee: Focal Point Positioning LimitedInventors: Ramsey Faragher, Nicolas Couronneau, Mark Crockett, Peter Duffett-Smith
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Publication number: 20210278216Abstract: 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.Type: ApplicationFiled: May 10, 2021Publication date: September 9, 2021Inventors: Ramsey Faragher, Mark Crockett, Peter Duffett-Smith
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Publication number: 20210254979Abstract: There is disclosed a computer-implemented method performed in a tracking system for tracking the motion of a body, as a function of time, the method comprising: (a) during a first time period, obtaining first data related to the motion of a body from at least one primary positioning unit, wherein said at least one primary positioning unit is mounted on a first platform carried on the body, or wherein said at least one primary positioning unit is separate to the body, said primary positioning unit being operational during the first time period; (b) during the first time period, obtaining second data from one or more secondary sensors configured to make measurements from which position or movement may be determined, said one or more secondary sensors being mounted on one or more second platforms carried on the body; (c) generating first training data comprising the first data and second data; (d) during a second time period, obtaining third data from the one or more secondary sensors, and; (e) analysing the thiType: ApplicationFiled: April 12, 2021Publication date: August 19, 2021Applicant: Focal Point Positioning LimitedInventors: Ramsey Faragher, Robert Mark Crockett, Peter Duffett-Smith
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Patent number: 11035673Abstract: 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.Type: GrantFiled: February 12, 2018Date of Patent: June 15, 2021Assignee: Focal Point Positioning LimitedInventors: Ramsey Faragher, Mark Crockett, Peter Duffett-Smith
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Patent number: 10816672Abstract: 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).Type: GrantFiled: November 27, 2017Date of Patent: October 27, 2020Assignee: Focal Point Positioning Ltd.Inventors: Ramsey Faragher, Nicolas Couronneau, Robert Mark Crockett, Peter Duffett-Smith
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Publication number: 20200319347Abstract: A system is disclosed for determining a physical metric such as position. The system comprises a local signal generator (8) configured to provide a local signal and a receiver (4) configured to receive a signal having properties corresponding to those in a signal transmitted by a trusted remote source. An inertial measurement unit (12) is configured to provide a measured or assumed movement of the receiver. A correlator (6) is configured to provide a correlation signal by correlating the local signal with the received signal. A motion compensation unit (14) is configured to provide motion compensation of at least one of the local signal, the received signal, and the correlation signal based on the measured or assumed movement.Type: ApplicationFiled: March 19, 2020Publication date: October 8, 2020Inventors: Ramsey Faragher, Robert Mark Crockett, Peter Duffett-Smith, Nicolas Couronneau
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Patent number: 10321430Abstract: A method, apparatus, computer program, and data structure relating to: causing correlation of a digital signal provided by a receiver with a motion-compensated correlation code, wherein the motion-compensated correlation code is a correlation code that has been compensated before correlation using one or more phasors dependent upon an assumed or measured movement of the receiver.Type: GrantFiled: March 21, 2017Date of Patent: June 11, 2019Assignee: Focal Point Positioning Ltd.Inventors: Ramsey Faragher, Nicolas Couronneau, Robert Mark Crockett, Peter Duffett-Smith
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Publication number: 20190128673Abstract: 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.Type: ApplicationFiled: February 12, 2018Publication date: May 2, 2019Inventors: Ramsey Faragher, Mark Crockett, Peter Duffett-Smith
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Publication number: 20190086553Abstract: A method, apparatus, computer program, data structure, signal relating to: causing correlation of a digital signal provided by a receiver with a motion-compensated correlation code, wherein the motion-compensated correlation code is a correlation code that has been compensated before correlation using one or more phasors dependent upon an assumed or measured movement of the receiver.Type: ApplicationFiled: March 21, 2007Publication date: March 21, 2019Inventors: Ramsey Faragher, Nicolas Couronneau, Mark Crockett, Peter Duffett-Smith
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Publication number: 20190011569Abstract: 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).Type: ApplicationFiled: November 27, 2017Publication date: January 10, 2019Inventors: Ramsey Faragher, Nicolas Couronneau, Robert Mark Crockett, Peter Duffett-Smith
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Publication number: 20170279598Abstract: A method, apparatus, computer program, and data structure relating to: causing correlation of a digital signal provided by a receiver with a motion-compensated correlation code, wherein the motion-compensated correlation code is a correlation code that has been compensated before correlation using one or more phasors dependent upon an assumed or measured movement of the receiver.Type: ApplicationFiled: March 21, 2017Publication date: September 28, 2017Inventors: Ramsey Faragher, Nicolas Couronneau, Robert Mark Crockett, Peter Duffett-Smith
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Publication number: 20080070589Abstract: The invention provides a method of combining satellite positioning system signals and position information derived from such signals in a mobile terminal, when these are available at a first location, with cellular communication signals and a method, system and apparatus for determining the approximate position information for the said mobile terminal when SPS signals are not available at a second location. The approximate position is determined in the mobile terminal only using a position difference vector derived from the cellular communication signals using time offsets and associated time-tags in a method based on the observed time difference of arrival. The computations of cellular position and position difference information are made within the network infrastructure. The invention provides for the security of the user as only position difference information is communicated over the air interface, or transmission time offset measurements which require non-transmitted information to determine a solution.Type: ApplicationFiled: October 30, 2007Publication date: March 20, 2008Inventors: Paul Hansen, Peter Duffett-Smith, Anthony Pratt
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Patent number: 7228228Abstract: The present invention provides a tracking system in which a mobile tag having an unknown position, which tag is to be tracked in space over time, transmits a signal comprising a pair of tones at different frequencies. The transmitted signal is received at each of three receivers, each having a known location, where the phase of each of the tones within the signal is measured. The measured phases are passed to a processing unit which determines the position of the tag at the time of transmission of the signal on the basis of the difference between the measured phases of the two tones. The tracking system operates over a defined finite range to track the position of the mobile tag uniquely in space.Type: GrantFiled: November 14, 2001Date of Patent: June 5, 2007Assignee: Sagentia LimitedInventors: David Bartlett, Michael Reynolds, Paul Smith, Nicolas Vasilopoulos, Peter Duffett-Smith
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Publication number: 20070066231Abstract: A method of and system for calibrating un-calibrated time information within a mobile terminal 101 is disclosed. The terminal has a receiver 203 capable of receiving signals from which calibrated time information carried by a calibrated system (a satellite positioning system) can be extracted, and a receiver 200 capable of receiving signals from which un-calibrated time information carried by an un-calibrated stable system (a cellular communications system) may be extracted. The time offset between calibrated time information extracted from the calibrated system and un-calibrated time information extracted from the un-calibrated stable system is determined at a first terminal position where the signals from the un-calibrated stable system are available, the travel times of the signals from the un-calibrated stable system are known or determined, and the signals from the calibrated system are available.Type: ApplicationFiled: July 25, 2006Publication date: March 22, 2007Inventors: Peter Duffett-Smith, Anthony Pratt, David Bartlett
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Publication number: 20050259763Abstract: The invention provides a method of estimating the time offsets between signals transmitted by plural transmitters of a communications network and received by a receiver attached to a terminal. In the method a section of a representation of the signals from the plural transmitters received by the receiver at the terminal (a “terminal section”) is created as are a first section of a representation of the signal transmitted by a first of said transmitters and a second section of a representation of the signal transmitted by a second of said transmitters. Each of the first and second sections overlaps in time with the terminal section. Using the first section, the second section and a set of signal parameters, including initial estimates of the time offsets between the first section and the terminal section and between the second section and the terminal section, a model of a section of a representation of the composite signal received by the receiver from the first and second transmitters is created.Type: ApplicationFiled: August 18, 2003Publication date: November 24, 2005Applicant: CAMBRIDE POSTITOINING SYSTEMS LIMITEDInventors: Peter Duffett-Smith, Malcolm MacNaughtan, Christopher Clarke, Robert Rowe