Abstract: In some examples, an accelerometer system includes a first excitation ring comprising: a first housing; and a first cover removably attached to the first housing, wherein the first housing and the first cover define a first recess. The accelerometer system also includes a second excitation ring comprising: a second housing; and a second cover removably attached to the second housing, wherein the second housing and the second cover define a second recess. The accelerometer system also includes a proof mass assembly; and processing circuitry located within one or both of the first recess and the second recess, wherein the first excitation ring and the second excitation ring shield the processing circuitry from harmful levels of radiation existing outside of the accelerometer system, and wherein the processing circuitry is configured to maintain a proof mass of the proof mass assembly in a null position.

Abstract: A system includes a reversible proton exchange membrane (PEM) fuel cell stack configured to receive oxygen and to controllably receive water and hydrogen, an electrical bus for coupling to a vehicle engine to receive electricity, the electrical bus coupled to the reversible fuel cell stack to controllably receive electricity from the fuel cell stack and provide electricity to the reversible fuel cell stack, and a hydrogen storage unit coupled to controllably receive hydrogen from the fuel cell stack, provide hydrogen to the fuel cell stack, and to provide hydrogen to a hydrogen gas powered electricity generator unit to couple to the electrical bus.

Abstract: A rotary mechanical system includes an electric machine, such as an electric motor, and a housing at least partially housing one or more components of the electric machine. The housing defines an electrical cavity and a coolant cavity. The electrical cavity houses one or more electrical components, such as a stator, of the electric machine. The coolant cavity is configured to receive a liquid coolant, such as ethylene glycol and water, from a liquid coolant system. The housing is configured to seal a two-phase refrigerant within the electrical cavity to transfer heat from the one or more electrical components to a wall of the electrical cavity and from the wall of the electrical cavity to the liquid coolant.

Abstract: A tool for providing a visualization of a system may reveal an interactive navigation environment for building performance observation and assessment. The tool may be associated with a processor. The environment may incorporate a treemap, a graph pane, a treemap filter, a graph pane selector, a selected units box and a date/time control mechanism. A visualization of the environment, among other things, may be presented on a display. The treemap may exhibit a building geometry and/or equipment units hierarchically, along with some data information. Units may be interactively selected from the treemap and placed in the box for analysis. The graph pane may show a configuration and display of unit analysis. Selection of detailed views for units in the box may be provided by the graph pane selector. Date and time intervals for analysis may be selected by the control mechanism.

Abstract: A frequency modulated continuous wave (FMCW) radar antenna that may provide isolation between the transmit (Tx) antenna and the receive (Rx) antenna based on the arrangement of the transmit elements and the receive elements. The transmit antenna elements for the antenna of this disclosure may be orthogonally fed, e.g., different by 90 degrees, compared to the receive antenna elements. For example, for horizontally polarized receive antenna elements, the transmit elements may be vertically polarized, or vice versa. The cross-polarized antenna elements may cause attenuation of surface waves between the Tx and Rx antennae. A low insertion loss 90-degree polarizer layer over one of the transmitter antenna, or the receiver antenna, to convert either the transmitted signals or the received reflections by 90-degrees so the reflected signal matches the polarization of the receiver antenna.

Abstract: Embodiments utilize an optical frequency comb generator coupled to an optical resonator of an optical gyroscope. The optical frequency comb generator generates an optical frequency comb having frequency peaks that each correspond to a respective resonance frequency of the optical resonator. A control servo can be coupled to the optical frequency comb generator and controls the optical frequency comb output from the optical frequency comb generator. In doing so, the optical frequency comb remains tuned to the resonance frequencies of the optical resonator during gyroscope operation.

Abstract: An apparatus and method that monitors gas pressures at a gas pressure regulator valve is disclosed. The gas pressure regulator valve includes an inlet pressure detector for sensing an inlet gas pressure applied to the gas pressure regulator and an outlet pressure detector configured to sense an outlet gas pressure supplied by the gas regulator valve. A memory records the inlet gas pressure and the outlet gas pressure and a computing unit operably coupled to the memory analyzes the recorded inlet gas pressure and the outlet gas pressure to detect a change in the inlet and/or the outlet gas pressure and to generate a notification to indicate the operational status of the gas pressure regulator valve. A communication unit communicatively coupled to the computing unit transmits the notification and the inlet gas pressure and the outlet gas pressure to a gas utility operating the gas supply system.

Abstract: A method for detecting spoofing comprises monitoring signals from GNSS and SBAS satellites with a GNSS receiver; obtaining current time and orbital parameters from the receiver, based on real-time signals from the satellites; computing orbital positions based on the current time and orbital parameters; retrieving past orbital parameters; calculating predicted orbital positions based on the orbital parameters with respect to current time and the past orbital parameters; computing current orbital positions based on current satellite signals; determining a first distance value between two or more of the satellites based on the predicted orbital positions; determining a second distance value between two or more of the satellites based on the current orbital positions; comparing the first and second distance values to obtain a discriminator value; determining whether the discriminator value is greater than a threshold level, and outputting a spoofing alert when the discriminator value is greater than the threshold

Abstract: A method of operating a resonator optical gyroscope includes generating optical signals having a broadband frequency range. The method includes coupling the optical signals into an optical resonator (OR) to propagate in a first direction and coupling the optical signals out of the OR after the optical signals pass through the OR in the first direction. The method includes coupling optical signals into the OR to propagate in a second direction and coupling optical signals out of the OR after the optical signals pass through the OR in the second direction. The method includes amplifying the optical signals coupled out of the OR by the second optical coupler or the optical signals coupled out of the OR by the first optical coupler to generate amplified optical signals and generating electrical signals corresponding to the amplified optical signals. The method includes determining a rotation rate based on the electrical signals.

Abstract: A method for detecting Global Navigation Satellite System (GNSS) spoofing is provided. The method includes receiving signals at a GNSS receiver; processing the signals to determine a calculated position; searching a list of distance measuring equipment (DME) transponders around the calculated position to select a set of DME transponders; sorting the set of DME transponders based on a respective distance between the calculated position and a respective position of each of the DME transponders; selecting a subset of the DME transponders based on the sorting; for each of the subset of the DME transponders, incrementing a counter when a difference between a real slant range, determined by communicating with the DME transponder, and an expected slant range based on height, position and known location of the DME transponder, exceeds a first threshold; and when the counter is greater than a second threshold, indicating that the position is spoofed.

Abstract: Methods, devices, and systems for adjusting for air flow temperature changes in an aspirating smoke detector are described herein. In some examples, one or more embodiments include a blower configured to cause air to flow through the aspirating smoke detector, and a controller configured to determine a temperature of the air flowing through the aspirating smoke detector has changed by a particular amount and adjust a speed of the blower in response to compensate the air flowing through the aspirating smoke detector that has changed by the particular amount.

Abstract: Systems and methods for thermal management of computing systems are provided. The systems and methods described herein guarantee a thermal envelope of a computing system while preserving the compute and render performance capabilities of the computing system by implementing a thermal-aware scheduling policy, adjusting an amount of available memory bandwidth to computing resources, adjusting an amount of memory utilization by one or more applications executed by the computing resources, and/or allocating cache to workloads based on memory demands.

Abstract: A sensor discriminator for detecting a gaseous substance includes a power source, a discrimination module, a sensor simulator that simulates a metal organic framework under at least one simulation condition, a simulation circuitry electrically coupling the sensor simulator to the power source and the discrimination module, and a discriminator circuitry that electrically couples the power source and the discrimination module to a gas capture probe. The discrimination module compares a discrimination pulse and a simulation pulse from the power source after the discrimination pulse passes through a metal organic framework of the gas capture sensor and the simulation pulse passes through a simulation component of the sensor simulator. The discrimination module causes a discriminator output that includes the comparison of the discrimination pulse to the simulation pulse.

Abstract: Embodiments of the present disclosure provide improved user interfaces and mechanisms associated with controlling a vehicle. Some such embodiments provide a decluttered user interface that dynamically updates to provide detailed element(s) utilized to convey particular details of vehicle operation and/or adjust operation of the vehicle. Some embodiments cause rendering of an indicator associated with a value tape set to an invisible state, cause visibility of the value tape in response to interaction data, update the value tape upon second interaction data with the indicator, and set at least one value in response to third interaction data with the indicator and set the value tape back to an invisible state. In this regard, in some embodiments the user interface remains operable while simultaneously reducing the number of interface elements required to be rendered at a given time.

Abstract: A method of dynamic, real-time generation of a blended output from a plurality of sensors is provided. The method includes, at a frame rate, periodically storing samples from the plurality of sensors; band pass filtering the stored samples separately for each of the plurality of sensors over a time scale characteristic of a type of error for the plurality of sensors; storing the filtered samples; at an accumulation rate, iteratively updating a covariance matrix based on a selected number of filtered samples, removing data from the covariance matrix for any of the plurality of sensors that have failed; and calculating, based on the covariance matrix, changes to real-time coefficients to be applied to the outputs of each sensor of the plurality of sensors; and at the frame rate, applying the changes to the real-time coefficients; and calculating the blended output for the plurality of sensors based on the real-time coefficients.

Abstract: A method is provided that includes combining a light wave from a master laser with a light wave from a first slave laser to produce a first signal including a first beat note signal, detecting the first signal, providing the first signal to a first mixer in a feedback path of a first optical phase lock loop, receiving a signal from a first offset frequency source at the first mixer, applying a first notch filter in the feedback path of the first optical phase lock loop after the first mixer to remove mixer products from an output of the first mixer, locking a frequency of the light wave from the master laser to a resonant frequency of a fiber optic resonator, and phase locking the first slave laser to the frequency of the master laser in the first optical phase lock loop at a first offset frequency.

Abstract: An atomic clock is provided. An output of a tunable LO is coupled to a user output of the atomic clock. A charge pump adjusts the tunable LO with a LO tuning voltage. A follower circuit sets an output frequency of the atomic clock to a frequency of an external reference signal coupled to an external reference input. An atom referenced circuit sets the output frequency of the atomic clock to a frequency based on stored operating settings. A controller stores then current operating settings generated based on a then current external reference signal coupled to the external reference input. The controller is further configured to apply the stored then current operating settings to the atom referenced circuit when the then current external reference signal is removed from the external reference input to maintain the output frequency of the atomic clock at the output frequency set by the follower circuit.

Abstract: A computing system may mount on an ownship vehicle. The computing system may include a memory configured to store three-dimensional radar data indicating weather proximate to the ownship vehicle; a touchscreen; and processing circuitry. The processing circuitry is configured to output, for display by the touchscreen, a two-dimensional overhead profile of the weather proximate to the ownship vehicle; receive, from the touchscreen, an indication of a selected region of the weather proximate to the ownship vehicle; determine, based on the three-dimensional radar data, additional information corresponding to the selected region of the weather; and output, for display by the touchscreen, the two-dimensional overhead profile of the weather overlaid with an indication of the additional information about the selected region.

Abstract: An artillery configured to propel a projectile, the artillery comprising a firing mechanism, a barrel, and a helical electromagnetic recoil mechanism. The firing mechanism fires the projectile in a first direction toward a target. The barrel has an open-ended bore that guides the projectile in the first direction. The helical electromagnetic counter recoil mechanism includes an electrical energy source, a stator, and a helical electromagnetic armature. The electrical energy source provides electrical energy when the firing mechanism fires the projectile. The stator and armature generate an electromagnetic force via the electrical energy. The helical electromagnetic armature moves in a second direction opposite the first direction via the electromagnetic force when the firing mechanism fires the projectile in the first direction to minimize recoil of the artillery.

Abstract: Devices, systems, and methods for providing smoke detectors are described herein. One smoke detector of a fire sensing system includes a circuit board body, having a set of front scattering emitting light sources located on one side of an optical chamber, a receiver of front scattering light beams from the front scattering emitting light sources and backward scattering light beams, and a set of backward scattering emitting light sources located between the set of front scattering emitting light sources and the receiver, the backward scattering light beams emitted from the backward scattering emitters.