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 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 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, 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 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: 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: 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: A method and apparatus are disclosed for determining the position, or change in the position, of a mobile terminal. The terminal has a receiver for receiving the signals from one or more transmission sources at unknown positions and an independent positioning device able to find, when operative, the position of the mobile terminal. The method uses the independent positioning device to measure the position of the mobile terminal at one or more first locations. A respective first set of time or phase offset values of signals received from the transmission sources relative to each other or to a reference in the mobile terminal is measured in the mobile terminal, at each first location.

Abstract: To determine whether a mobile terminal of a communications system has moved outside a locale, the terminal measures relative time offsets of signals received by the terminal from transmitters of the network, relative to each other or a reference. At a first time when the terminal is within a given locale, the time of receipt of signals received by the terminal from a plurality of the transmitters relative to a reference or each other are measured to create a first set of receive time offsets. At a second time, a second set of receive time offsets is measured. Change(s) in receive time offsets is/are calculated, and change(s) between the first and second times in transmission time offsets of the signals transmitted by at least one transmitter is/are obtained to determine movement indicators that are compared with threshold valuets to determine whether the mobile terminal has moved outside the locale.

Abstract: A method of processing received satellite radio signals is disclosed in which signals are received the signals from plural satellites through a common antenna. The received signals are digitised to produce a time-series of digitised signal samples and a plurality of replicas representing the signals of each of the plurality of satellites are obtained. At least one sample is selected from each of the replicas and the elements of a register are set equal to the selected replica samples. Thereafter, in turn, for each one of said digitised signal samples, the value of the digitised signal sample is combined with each of the values of the elements of the register to produce corresponding modified values; and the modified values corresponding to each of said register elements are accumulated.

Abstract: 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.

Abstract: A navigation system is described which includes a mobile terminal 100 which has a transmission source receiver 204 for receiving the signals from one or more unsynchronised terrestrial transmission sources 102-105 and a satellite positioning receiver 200 for receiving signals from the satellite or satellites 107-110 of a satellite positioning system. The terminal also has a clock 208. A processor 209 is arranged to acquire a measurement vector having a list of values, each value representing a measurement made by a receiver 200,204, and the terminal clock's bias. It computes a state vector representing the current state of the system, using a previously-determined state vector, the measurement vector, and a dynamic model in order to derive a dynamic navigation solution.

Abstract: In a terminal 106 having a receiver 202 for receiving the signals from plural transmission sources 101-105 whose positions and transmission time offsets are unknown within the terminal, a method is provided for determining the change in the time (elapsed time) at the terminal between two instants. At a first position of the terminal a first set of measurements, aligned to a first instant, of a signal parameter representative of the time or phase of receipt of said signals from said plural transmission sources relative to one or more of them, or to a reference, or to a terminal clock is obtained. Then at a second position of the terminal a corresponding second set of measurements, aligned to a second instant, of a signal parameter representative of the time or phase of receipt of said signals from said plural transmission sources relative to one or more of them, or to the reference, or to the terminal clock is also obtained.

Abstract: A method of calculating the position or state of motion of one or more terminals is proposed in which each has a receiver capable of making measurements of signals received from one or more transmission sources for use in calculating the unknown position or state of motion of the or each terminal. At least one transmission source has a known directional transmission pattern, and the bearing from one of the receivers of the or each of the transmission source having a known directional transmission pattern is estimated. Weights are assigned to the measurements made by the one receiver, the weights being calculated from the bearing or bearings and the known directional transmission pattern of the transmission sources.