Abstract: A system includes a vehicle and a vehicle control system configured to autonomously control one or more operations of the vehicle. The system also includes a navigation receiver configured to identify a location of the vehicle and to provide the identified location to the vehicle control system. To identify the location of the vehicle, the navigation receiver is configured to identify whether navigation signals received by the navigation receiver are spoofed based on angles of arrival for the navigation signals and to suppress any of the navigation signals determined to be spoofed. The navigation receiver may be configured to suppress any of the navigation signals determined to be spoofed in order to prevent an illicit actor from misdirecting the vehicle to an undesired location and/or to prevent an illicit actor from causing the vehicle to make course corrections based on an incorrect current location of the vehicle.

Abstract: There is provided a method of mounting equipment to an aircraft. The method comprises attaching a mounting structure to the fuselage of the aircraft, the fuselage extending lengthwise along a longitudinal axis. This comprises irremovably attaching a plurality of substantially planar frames to the exterior of the fuselage, such that each frame is oriented orthogonal to the longitudinal axis and spaced apart from an adjacent frame; and irremovably attaching a plurality of intercostal ribs between pairs of adjacent frames of the plurality frames, such that each rib is oriented parallel to the longitudinal axis and attached to each of a pair of said adjacent frames. The method further comprises mounting equipment to or within the mounting structure; and covering the mounting structure and the equipment mounted thereon or therein with a cover. The method further comprises removably attaching the cover to the mounting structure or the fuselage. An assembly, structure, tailplane and aircraft are also provided.

Abstract: The method of manufacturing an integrated circuit includes obtaining a silicon carbide substrate of a first conductivity type having an epitaxial layer of a second conductivity type thereon. A dopant is implanted in the epitaxial layer to form a first region of the first conductivity type that extends the full depth of the epitaxial layer. A first transistor is formed in the first region and a second transistor is formed in the epitaxial layer.

Abstract: A power factor correction “PFC” circuit for use in AC-DC conversion comprises first and second pairs of switches connected across input and output rails in a full bridge configuration, and a controller configured to control the operation of the switches such that one pair of switches is switched on and off at an AC input frequency and the other pair of switches is switched on and off at high frequency; and the switching frequency is alternated between the pairs of switches every n cycles of the AC input/output frequency. The circuit may include inductors on both input rails and may be used in a bidirectional power supply.

Abstract: A method and apparatus for improving a dead reckoning estimate of a mobile unit is described. When an accurate position cannot be determined for a mobile unit, for example if GPS is unavailable, a dead reckoning estimate can be improved when two or more mobile units share their position estimates and the shared position estimates are used with either the range between the two units or knowledge that the units are within a threshold distance of each other to refine the position estimate of at least one unit.

Abstract: Systems and methods utilize an inertial navigation sub-system configured to determine a plurality of relative positions of the navigation system from a reference position based on the determined speed and/or acceleration and/or direction of the navigation system and/or changes thereto; and a position estimator sub-system configured to estimate the absolute position of the navigation system based on at least two received signals. A first track is defined based on the plurality of relative positions determined by the inertial navigation sub-system during a period of time and a second track is defined based on the plurality of estimates of the absolute position by calculating a best fit using the plurality of estimates of the absolute position, where the second track approximates a same shape as the first track.

Abstract: A system for identifying spoofed navigation signals includes a multi-element antenna configured to receive a plurality of navigation signals. The system also includes at least one processor configured to determine an angle of arrival for each of the navigation signals and analyze the angles of arrival for the navigation signals to determine whether one or more of the navigation signals are spoofed. To analyze the angles of arrival for the navigation signals, the at least one processor may be configured to (i) determine whether two or more of the navigation signals were received at substantially the same angle of arrival (which may be based on a difference of less than 5° between the angles of arrival) and/or (ii) compare the angles of arrival for the navigation signals to at least one expected angle of arrival (which may be based on information about expected or actual positions of multiple satellites).

Abstract: The method of manufacturing an integrated circuit includes obtaining a silicon carbide substrate of a first conductivity type having an epitaxial layer of a second conductivity type thereon. A dopant is implanted in the epitaxial layer to form a first region of the first conductivity type that extends the full depth of the epitaxial layer. A first transistor is formed in the first region and a second transistor is formed in the epitaxial layer.

Abstract: A peak current mode ‘PCM’ controller comprising control logic arranged to produce a series of digital control values derived from a voltage sense signal, control logic arranged to produce a digital slope compensation value, a first digital to analogue converter ‘DAC’ arranged to receive the series of digital control values and output a corresponding analogue control voltage, a second DAC arranged to receive the digital slope compensation value and output a corresponding analogue slope compensation voltage, an analogue differential integrator arranged to receive the analogue control voltage and the analogue slope compensation voltage, integrate the analogue slope compensation voltage, subtract the integrated slope compensation voltage from the analogue control voltage, and output the result of the subtraction as an analogue output voltage, a comparator arranged to compare the analogue output voltage to a voltage of an analogue current sense signal and produce an output signal when the analogue current sense si

Abstract: There is provided a method of mounting equipment to an aircraft having an empennage. The method comprises mounting equipment to a mounting structure for mounting to the aircraft; removing an access panel from the outer skin of the empennage of the aircraft to reveal an access panel opening into the empennage; and attaching the mounting structure to or within the access panel opening such that at least a portion of the equipment extends beyond the outer skin of the empennage. The shape of the mounting structure at least partly conforms to the shape of the access panel opening. The method also comprises covering the mounting structure and the equipment mounted thereon with a cover, and attaching the cover to the mounting structure or the empennage. An assembly, structure, tailplane and aircraft are also provided.

Abstract: The method of manufacturing an integrated circuit includes obtaining a silicon carbide substrate of a first conductivity type having an epitaxial layer of a second conductivity type thereon. A dopant is implanted in the epitaxial layer to form a first region of the first conductivity type that extends the full depth of the epitaxial layer. A first transistor is formed in the first region and a second transistor is formed in the epitaxial layer.

Abstract: A system for identifying spoofed navigation signals includes a multi-element antenna configured to receive a plurality of navigation signals. The system also includes at least one processor configured to obtain a gain vector for each of the navigation signals and analyze the gain vectors for the navigation signals to determine whether one or more of the navigation signals are spoofed. To analyze the gain vectors for the navigation signals, the at least one processor may be configured to (i) determine whether at least a specified number of the navigation signals have substantially the same gain vectors and (ii) in response to determining that at least the specified number of the navigation signals have substantially the same gain vectors, determine that the navigation signals having substantially the same gain vectors are spoofed.

Abstract: Systems and methods determine a position using uncoordinated signals containing timing information. The systems and methods use uncoordinated signals of opportunity, such as radio time signals, to determine a position of a receiver by determining the relative synchronization of the signals of opportunity at a known location and, at a later time and unknown locations, using trilateration or multilateration of the signals of opportunity to determine the position of the receiver.

Abstract: A power factor correction “PFC” circuit for use in AC-DC conversion comprises first and second pairs of switches connected across input and output rails in a full bridge configuration, and a controller configured to control the operation of the switches such that one pair of switches is switched on and off at an AC input frequency and the other pair of switches is switched on and off at high frequency; and the switching frequency is alternated between the pairs of switches every n cycles of the AC input/output frequency. The circuit may include inductors on both input rails and may be used in a bidirectional power supply.

Abstract: There is provided a method of mounting equipment to an aircraft. The method comprises attaching a mounting structure to the fuselage of the aircraft, the fuselage extending lengthwise along a longitudinal axis. This comprises irremovably attaching a plurality of substantially planar frames to the exterior of the fuselage, such that each frame is oriented orthogonal to the longitudinal axis and spaced apart from an adjacent frame; and irremovably attaching a plurality of intercostal ribs between pairs of adjacent frames of the plurality frames, such that each rib is oriented parallel to the longitudinal axis and attached to each of a pair of said adjacent frames. The method further comprises mounting equipment to or within the mounting structure; and covering the mounting structure and the equipment mounted thereon or therein with a cover. The method further comprises removably attaching the cover to the mounting structure or the fuselage. An assembly, structure, tailplane and aircraft are also provided.

Abstract: There is provided a method of mounting equipment to an aircraft having an empennage. The method comprises mounting equipment to a mounting structure for mounting to the aircraft; removing an access panel from the outer skin of the empennage of the aircraft to reveal an access panel opening into the empennage; and attaching the mounting structure to or within the access panel opening such that at least a portion of the equipment extends beyond the outer skin of the empennage. The shape of the mounting structure at least partly conforms to the shape of the access panel opening. The method also comprises covering the mounting structure and the equipment mounted thereon with a cover, and attaching the cover to the mounting structure or the empennage. An assembly, structure, tailplane and aircraft are also provided.

Abstract: A method and apparatus for improving a dead reckoning estimate of a mobile unit is described. When an accurate position cannot be determined for a mobile unit, for example if GPS is unavailable, a dead reckoning estimate can be improved when two or more mobile units share their position estimates and the shared position estimates are used with either the range between the two units or knowledge that the units are within a threshold distance of each other to refine the position estimate of at least one unit.

Abstract: The lateral bipolar junction transistor has a silicon carbide layer, the silicon carbide layer comprises a base region with a first conductivity type, a collector region with a second conductivity type and an emitter region with a second conductivity type. The collector region and the emitter region are within the base region, and the base region, collector region and emitter region are all arranged along an upper surface of the silicon carbide layer.

Abstract: A method and apparatus for improving a dead reckoning estimate of a mobile unit is described. When an accurate position cannot be determined for a mobile unit, for example if GPS is unavailable, a dead reckoning estimate can be improved when two or more mobile units share their position estimates and the shared position estimates are used with either the range between the two units or knowledge that the units are within a threshold distance of each other to refine the position estimate of at least one unit.

Abstract: The method of manufacturing an integrated circuit includes obtaining a silicon carbide substrate of a first conductivity type having an epitaxial layer of a second conductivity type thereon. A dopant is implanted in the epitaxial layer to form a first region of the first conductivity type that extends the full depth of the epitaxial layer. A first transistor is formed in the first region and a second transistor is formed in the epitaxial layer.