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.

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 surf

Abstract: A method and apparatus configured to create a zone of privacy within which tracking signals, transmitted by a tracking device located within the privacy zone, cannot be used to identify a location of the tracking device.

Abstract: A method and apparatus for determining a frequency related parameter of a frequency source. In some embodiments, the method includes receiving a plurality of signals from a plurality of remote sources; generating motion compensated correlation results using a determined receiver motion, the received signals, and a local signal derived from the local frequency source; phase compensating the motion compensated correlation results to produce phase compensated correlation results using a plurality of phasor sequences that represent frequency error of the local frequency source; and jointly analysing the phase compensated correlation results associated with the plurality of remote sources to determine a frequency related parameter of the local frequency source.

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.

Abstract: A method and apparatus for performing motion compensated signal processing without using traditional IMU data from a full complement of traditional IMU sensors. In some embodiments, the method may include: receiving, at a receiver, a first signal from a remote source in a first direction; providing a first local signal; determining, using first data, and without using data derived from an accelerometer, a movement of the receiver; providing a correlation signal by correlating the local signal with the received signal; providing motion compensation of at least one of the local signal, the received signal, and the correlation signal, based on the determined movement in the first direction to provide preferential gain for a signal received along the first direction and processing the received first signal based on the said correlation.

Abstract: A system is disclosed and comprises a mobile platform, an antenna configured to receive a signal from a remote source in a first direction, a movement mechanism mounted to the platform, wherein the antenna is mounted to the movement mechanism, the movement mechanism being configured to move the antenna relative to the platform, and a controller configured to: generate a local signal, determine a component of motion of the antenna in the first direction, correlate the local signal with the received signal to provide a correlation signal, and motion compensating at least one of the local signal, the signal from the remote source, and the correlation signal based on the determined motion of the antenna in the first direction.

Abstract: A method, apparatus, and system for determining locations of cellular emitters include receiving at least one signal from the cellular emitters at an antenna of at least one receiver, determining a motion of the antenna of the at least one receiver that received the at least one signal, using the determined antenna motion, performing motion compensated correlation upon the at least one received signal to generate at least one motion compensated correlation result, determining a direction of arrival for the at least one received signal using the at least one motion compensated correlation result, and determining a location of the cellular emitters using the direction of arrival of the at least one received signal and a known location of the at least one receiver. A geolocation map of the locations of the emitters of, for example, cell base station towers can be generated using determined emitter locations.

Abstract: A method, apparatus and system for determining a legitimacy of a signal source for providing signal intelligence and security includes receiving a signal from at least one emitter at an antenna of at least one receiver, determining a motion of the antenna of the at least one receiver, performing motion compensated correlation on the received signal to generate at least one motion compensated correlation result, determining a direction of arrival for the received signal using the motion compensated correlation result, determining a location of the at least one emitter using the direction of arrival of the received signal, and determining the legitimacy for the at least one emitter based on the determined location of the at least one emitter and information regarding locations of legitimate emitters. Additionally, an action affecting the reception of signals from the emitter at the receiver can be performed based on the legitimacy of the emitter.

Abstract: Methods and systems including: generating a first local signal (LS); receiving, at a receiver, a first signal from a remote source; determining a receiver movement; generating a first correlation signal by correlating the first LS with the first signal; providing motion compensation of at least one of the first LS, the first signal, and the first correlation signal based on the receiver movement along a direction of interest (DOI) to generate a first correlation signal; determining that the first signal has been received along the DOI, based on the first correlation signal, generating a second LS having at least one parameter based on the first signal received along the DOI; receiving, at the receiver, a second signal along the DOI; and processing the received second signal using the second LS to determine a metric of interest related to the receiver, and/or to a communications link that includes the receiver.

Abstract: A method, apparatus and system for improving co-channel operation of simultaneously operating, independent radio signals. The method, apparatus and system receive at least two co-channel RF signals, perform motion compensated correlation upon at least one of the at least two co-channel RF signals, and determine the direction of arrival of the at least one of the at least two co-channel RF signals. In response to the direction of arrival determined for the at least one of the at least two co-channel RF signals, an action to perform to improve co-channel operation of the at least two co-channel RF signals at a subject receiver is determined.

Abstract: A method comprising receiving, at a receiver, a plurality of signals from at least one remote source and selecting at least one selected signal in the plurality of signals. The method determines, using the at least one selected signal, a position of the receiver and receives correction data for improving the position of the receiver to a sub-wavelength accuracy. The method further determines motion of the receiver, generates, from the at least one selected signal, a motion-compensated correlation signal based on the determined motion of the receiver and uses the motion-compensated correlation signal to either (1) select the at least one selected signal to be used to determine the position of the receiver, (2) correct at least one of motion sensor errors or clock errors, or (3) both (1) and (2). Embodiments include a positioning system for performing the method.

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.

Abstract: Methods and systems are disclosed for radio positioning of a vehicle using a virtual positioning reference established by logging a known position of the vehicle together with a local time that a first instance of a predictably repeated code word is received from an opportunistic terrestrial radio transmitter. During movement of the vehicle to a second, unknown position, a local clock is used to determine the time difference between when the virtual positioning reference is predicted to receive a second instance of the code word and when the vehicle actually receives the second instance of the code word, thereby providing positioning information when traditional navigation signals such as GPS are not available. The radio positioning information is then used to initiate an action such as recording the location information for future retrieval by a user, and/or controlling the movements of an autonomous vehicle.

Abstract: A method of tracking an entity by monitoring a signal, the signal tending to vary spatially and be generally time-invariant, the entity moving from a first location within an area to a second location within the area, the method being suitable for use when the location of the source of the signal is unknown, the method comprising providing a plurality of particles for use with a particle filter, each particle being associated with a first particle location, a first particle location being an estimate of the first location of the entity, providing an estimate of the motion of the entity between the first location and the second location, using the estimate of the motion and using the particle filter, for each particle, updating the first particle location for that particle thereby producing an updated particle location, the updated particle location being an estimate of the second location of the entity, for each updated particle, estimating at least one expected signal parameter at the updated particle locati

Abstract: Methods and systems are disclosed for radio positioning of a vehicle using a virtual positioning reference established by logging a known position of the vehicle together with a local time that a first instance of a predictably repeated code word is received from an opportunistic terrestrial radio transmitter. During movement of the vehicle to a second, unknown position, a local clock is used to determine the time difference between when the virtual positioning reference is predicted to receive a second instance of the code word and when the vehicle actually receives the second instance of the code word, thereby providing positioning information when traditional navigation signals such as GPS are not available. The radio positioning information is then used to initiate an action such as recording the location information for future retrieval by a user, and/or controlling the movements of an autonomous vehicle.

Abstract: Methods and systems are disclosed for radio positioning of a mobile receiver using a virtual positioning reference established by logging a known position of the mobile receiver together with a local time at which a first instance of a predictably repeated code word is received by the mobile receiver from a terrestrial radio signal transmitter. During movement of the mobile receiver from the first known position to a second unknown position, a local clock is used to determine the time difference between when the virtual positioning reference is predicted to receive a second instance of the code word and when the mobile receiver actually receives the second instance of the code word.

Abstract: A method and system of determining the position of a radio signal transmitter are described. The method includes determining the type of radio signal being transmitted from the radio signal transmitter by analysing radio signal characteristics and correlating different sets of information to determine the position of the radio signal transmitter. Each set of information corresponds to a different relative position of at least one receiver to the transmitter and includes radio signal data derived from radio signals received by the at least one receiver from the transmitter at each respective relative position and positioning data containing information about the position of the at least one receiver at each respective relative position.

Abstract: A method of tracking an entity by monitoring a signal, the signal tending to vary spatially and be generally time-invariant, the entity moving from a first location within an area to a second location within the area, the method being suitable for use when the location of the source of the signal is unknown, the method comprising providing a plurality of particles for use with a particle filter, each particle being associated with a first particle location, a first particle location being an estimate of the first location of the entity, providing an estimate of the motion of the entity between the first location and the second location, using the estimate of the motion and using the particle filter, for each particle, updating the first particle location for that particle thereby producing an updated particle location, the updated particle location being an estimate of the second location of the entity, for each updated particle, estimating at least one expected signal parameter at the updated particle locati

Abstract: Methods and systems for estimating the position of a radio signal receiver are described. The position of a first stationary radio signal transmitter is estimated using a primary set of positioning resources available to the receiver. Once the position of the first transmitter has been determined, it is added to a secondary set of positioning resources available to the receiver. If the primary set of positioning resources is ineffectual, the secondary set of positioning resources may be used to estimate the position of the receiver.