Focal Point Positioning Limited

Bae Systems, Inc.

Nicolas Couronneau

Ramsey Michael Faragher

Robert Mark Crockett

Peter James Duffett-Smith

David Nicholson

Mark Crockett

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.

Method and system for calibrating a system parameter

A system is disclosed for determining a physical metric such as position. The system comprises a local signal generator () configured to provide a local signal and a receiver () configured to receive a signal having properties corresponding to those in a signal transmitted by a trusted remote source. An inertial measurement unit () is configured to provide a measured or assumed movement of the receiver. A correlator () is configured to provide a correlation signal by correlating the local signal with the received signal. A motion compensation unit () 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 () 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 () 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 ().

System for determining a physical metric such as position

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.

Method, apparatus, computer program, chip set, or data structure for correlating a digital signal and a correlation code

A positioning device () is disclosed comprising at least one antenna () for receiving ranging signals, such as GNSS signals. The device comprises a local oscillator () for providing a local frequency or phase reference and an inertial sensor () for measuring a movement of the device. A processor () 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 () 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 () can then use the local frequency or phase reference from the local oscillator (), and the offset calculated by the local oscillator offset determination module (), to provide a local signal using a local signal generator (). The local signal can be correlated against a received ranging signal for use in positioning calculations performed by a positioning calculator ().

Method and system for correcting the frequency or phase of a local signal generated using a local oscillator

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.

Growing community of inventors

Bristol, United Kingdom

Nicolas Couronneau