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公开(公告)号：US20220404509A1
公开(公告)日：2022-12-22
申请号：US17892682
申请日：2022-08-22
Applicant: Focal Point Positioning Limited
Inventor： Ramsey FARAGHER , Robert Mark Crockett , Peter Duffett-Smith , Nicolas Couronneau
Abstract: 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. A signal analysis unit (16) is configured to determine whether the received signal includes a component received in a direction that is different to a line-of-sight direction between the receiver and the trusted remote source, wherein the determination is based on the correlation signal. Finally, a metric determination unit or positioning unit (20) is configured to determine a physical metric associated with the receiver, such as its position, based on the determination made by the signal analysis unit (16).
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公开(公告)号：US20220404511A1
公开(公告)日：2022-12-22
申请号：US17892671
申请日：2022-08-22
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：US20240027194A1
公开(公告)日：2024-01-25
申请号：US18377380
申请日：2023-10-06
Applicant: Focal Point Positioning Limited
Inventor： Ramsey FARAGHER , Mark Crockett , Peter Duffett-Smith
CPC classification number: G01C21/005 , G01S19/48 , G01C22/006 , G01S19/485 , G01C21/1654 , G01C21/188 , G01C21/1652 , G01C21/185 , G01C21/1656
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：US20230168385A1
公开(公告)日：2023-06-01
申请号：US18103786
申请日：2023-01-31
Applicant: Focal Point Positioning Limited
Inventor： Ramsey FARAGHER , Robert Mark CROCKETT , Peter DUFFETT-SMITH , Nicolas COURONNEAU
CPC classification number: G01S19/22 , G01S19/428 , G01S19/26 , G01S19/47
Abstract: 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. A signal analysis unit (16) is configured to determine whether the received signal includes a component received in a direction that is different to a line-of-sight direction between the receiver and the trusted remote source, wherein the determination is based on the correlation signal. Finally, a metric determination unit or positioning unit (20) is configured to determine a physical metric associated with the receiver, such as its position, based on the determination made by the signal analysis unit (16).
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