Abstract: Systems and methods for mitigating ground induced currents are provided. In one or more examples, the systems and methods can utilize one or more device(s) that can be configured to detect DC currents being induced in and propagated along a power line that is transmitting an AC power signal. In one or more examples the device can be separate the desirable AC power waveform from the undesirable induced DC voltage and determine if the level of induced DC propagating on the power line requires mitigation. In one or more examples, if it is determined that mitigation is required, then the device can be configured to trigger a switch that can be shunt the DC power at the AC waveform zero crossing to a circuit element that is configured to dissipate the undesirable DC current. Filtering can be employed to remove any inadvertent low voltage harmonic distortion. The switch can be triggered during a zero-crossing of the signal to minimize disruption to an end user of the power signal.

Abstract: Described are methods, systems, and computer-program product embodiments for deriving a model of computation of a cyber-physical system (CPS). In some embodiments, a method includes receiving, from the CPS network, network-events data corresponding to a process performed by the CPS and including network events and associated group IDs. A plurality of events logs for a plurality of selections of group IDs are generated with each events log including a sequence of network events selected from the network events based on the selection of group IDs for that events log. A plurality of directed graphs for the plurality of events logs are generated with each directed graph generated based on the sequence of network events in the events log. A plurality of group IDs can be determined based on a directed graph selected from the plurality of directed graphs based on a complexity score calculated for each directed graph.

Abstract: A system and method for generating communications waveforms that can operate in congested frequency spaces and in applications in which the receiver is moving with respect to the transmitter is provided. In one or more examples, each symbol to be encoded and transmitted is converted into a sequence of frequency chirps. The sequence of frequencies used by the sequence of chirps is based on the symbol that is to be encoded. Each chirp can have a center frequency, and the frequency can be swept over the duration of the chirp. In this way each chirp can have a varying frequency over the duration of the chirp, but the phase of the chirp can be continuous throughout the duration of the chirp. The bandwidth and sweep rate of the chirp can be based on the expected maximum velocity of the receiver and the transmitter relative to one another.

Abstract: Systems and methods for automatically injecting effects in cyber-physical systems and their simulations are provided herein. In one example, the cyber-physical system under test can include one or more watch-point monitors that can analyze messages between components of the system to determine the presence of one or more particular patterns present in the messages being passed between components of the system during operation. In one or more examples, upon detection of one or more conditions matching a watch point, the systems and methods presented herein can activate an effect and inject it into the cyber-physical system under test based on the detected watch point. In one or more examples, the systems and methods can provide a domain-specific “effects language” (EL) that can allow a user to specify a watch point and an effect corresponding to the watch point.

Abstract: Described are systems and methods for detecting an anomaly among a plurality of components operating in a system. In some embodiments, a method includes monitoring a plurality of metrics for the plurality of components across a plurality of time periods. For each time period, the plurality of components is clustered into a plurality of clusters based on measurement information corresponding to the plurality of metrics received for the time period. For each component, a plurality of correspondences is determined between the clusters in which the component is grouped for a plurality of pairs of adjacent time periods. Then, whether each component is operating anomalously can be determined based on the plurality of determined correspondences.

Abstract: Systems and methods for estimating magnetic susceptibility of a patient through continuous motion in an MRI scanner are provided herein. In one or more examples, during the collection of data, the patient can be instructed to move their head or other part of the body in a continuous manner and for a fixed duration of time. During the fixed duration of time, magnitude a data from the RF signal can be received by one or more RF coils can be collected. The received and undersampled magnitude data can be converted to phase data which can then be converted to magnetic susceptibility. Thus magnetic susceptibility can be determined while allowing for continuous motion during the MRI scan, which can be more comfortable and feasible for the patient in contrast to techniques that require the patient to hold their body at a particular orientation in the scanner for a fixed duration of time.

Abstract: Systems and methods for estimating magnetic susceptibility of a patient through continuous motion in an MRI scanner are provided herein. In one or more examples, during the collection of data, the patient can be instructed to move their head or other part of the body in a continuous manner and for a fixed duration of time. During the fixed duration of time, magnitude a data from the RF signal can be received by one or more RF coils can be collected. The received and undersampled magnitude data can be converted to phase data which can then be converted to magnetic susceptibility. Thus magnetic susceptibility can be determined while allowing for continuous motion during the MRI scan, which can be more comfortable and feasible for the patient in contrast to techniques that require the patient to hold their body at a particular orientation in the scanner for a fixed duration of time.

Abstract: A method for determining position of a mobile system, the method includes receiving global navigation satellite (GNSS) signals by a receiver of the mobile system, generating a plurality of position estimates based on at least pseudo-distances determined from at least some of the GNSS signals, wherein each position estimate is generated based on a different set of pseudo-distances, determining an inconsistency in one or more of the position estimates based on verification information, generating a trust assessment for each position estimate based on determined inconsistencies, outputting a position estimate associated with a higher trust assessment as a position of the mobile platform, and reducing an influence of a GNSS signal on a future position estimate generation based on a lower trust assessment for position estimates generated based on the GNSS signal.

Abstract: A communications system and methods for covert communications are provided. A first transmitter that transmits an information carrying signal to a target receiver, a second transmitter and a third transmitter transmit jamming signals to the target receiver, such that the information carrying signals and the jamming signals are interleaved when received by the target receiver The information carrying signals and the jamming signals can be at least partially overlapping by an eavesdropper.

Abstract: System and methods for implementing a vector sensor array surface wave radar is provided. In one or more examples, the system can include a vector sensor array antenna that includes electromagnetic elements collectively configured to receive surface wave reflections generated by radar transmit antenna waves reflecting back from targets of interest. Once received by the vector sensor array, in one or more examples, the system can further include components that can process the incoming signal and use the incoming single to determine the location of one or more targets. In one or more examples, the vector surface array antenna can include three separate loop antennas that are arranged orthogonally to one another, and three dipole antennas that are arranged orthogonally to one another. In one or more examples, the vector surface array antenna can be configured to receive signals in the high frequency (HF) band.

Abstract: A transportable, resilient, high frequency system with a compact footprint is provided. The system may include a plurality of antenna elements arranged around a circle. A circular array provides a resilient radiation pattern that does not change based on the number of antennas in the array and is tolerant of errors in antenna placement. The gain of the system may be increased by increasing the number of antenna elements in the array to compensate for reduced efficiency of antenna elements having a radiating element with a length of less than half the wavelength of an operating frequency of the array.

Abstract: A system for reducing data collection burden, comprising: one or more programs including instructions for: receiving a first set of metrics for a plurality of facilities; receiving data associated with the first set of metrics from one or more facilities of the plurality of facilities; determining one or more anomalies in the received data; removing the determined one or more anomalies from the received data; selecting a second set of metrics from the first set of metrics, wherein a number of metrics of the second set is less than a number of metrics of the first set of metrics; and outputting a recommendation applicable to the plurality of facilities based on the second set of metrics.

Abstract: A communications system and methods for covert communications are provided. A first transmitter that transmits an information carrying signal to a target receiver, a second transmitter and a third transmitter transmit jamming signals to the target receiver, such that the information carrying signals and the jamming signals are interleaved when received by the target receiver The information carrying signals and the jamming signals can be at least partially overlapping by an eavesdropper.

Abstract: Systems and methods for mitigating ground induced currents are provided. In one or more examples, the systems and methods can utilize one or more device(s) that can be configured to detect DC currents being induced in and propagated along a power line that is transmitting an AC power signal. In one or more examples the device can be separate the desirable AC power waveform from the undesirable induced DC voltage and determine if the level of induced DC propagating on the power line requires mitigation. In one or more examples, if it is determined that mitigation is required, then the device can be configured to trigger a switch that can be shunt the DC power at the AC waveform zero crossing to a circuit element that is configured to dissipate the undesirable DC current. Filtering can be employed to remove any inadvertent low voltage harmonic distortion. The switch can be triggered during a zero-crossing of the signal to minimize disruption to an end user of the power signal.

Abstract: A system for establishing and maintaining a communications network includes: one or more programs including instructions for: receiving a first set of data associated with a first set of communication links, the first set of communication links configured to establish connection between devices; receiving a second set of data associated with a second set of communication links; receiving a determination of whether one or more communication links of the first set satisfy a pre-determined quality level; receiving a determination of whether one or more communication links of the second set satisfy the pre-determined quality level; receiving a selection from the one or more communication links of the second set that have been determined to satisfy the pre-determined quality level; and connecting the devices via the selected one or more communication links if one or more communication links of the first set is determined to not satisfy the pre-determined quality level.

Abstract: A method of performing a flight simulation is provided. The method includes retrieving a flight action, mapping the flight action to an instruction, the instruction being configured to bring about a desired state of a flight simulator, identifying a command based on the desired state of the flight simulator and a first state of the flight simulator, and determining if a second state of the flight simulator after executing the command matches the desired state of the flight simulator.

Abstract: Disclosed herein are system, method, and computer program product embodiments for detecting spoofing of a navigation device. A plurality of anti-spoofing techniques are provided. The plurality of anti-spoofing techniques detect interference with data provided by one or more navigation devices for a plurality of threat situations. Positioning, timing and frequency characteristics associated with the one or more navigation devices are analyzed in order to identify a threat situation among the plurality of threat situations. Based on the identified threat situation one or more of the anti-spoofing techniques are executed. The one or more anti-spoofing techniques can be executed in parallel in order to provide various anti-spoofing detection techniques at the same time.

Abstract: Provided are systems, methods, and devices for identifying correct satellite signals to improve the accuracy of a satellite navigation system. In some embodiments, identifying correct satellite signals may include receiving a plurality of satellite signals; demodulating the satellite signals to extract a first plurality of parameters; determining a first subset of parameters from the first plurality of parameters, wherein the first subset of parameters is based on a first geographic location; determining a second subset of parameters from a second plurality of parameters outside the first subset, the second plurality of parameters comprising one or more parameters of the first plurality of parameters outside the first subset, wherein the second subset of parameters is based on a second geographic location; and identifying an exemplary subset from the first subset and the second subset, wherein the exemplary subset comprises parameters corresponding to correct satellite signals.

Abstract: A system for machine learning model parameters for image compression, including partitioning image files into a first set of regions, determining a first set of machine learned model parameters based on the regions, the first set of machine learned model parameters representing a first level of patterns in the image files, constructing a representation of each of the regions based on the first set of machine learned model parameters, constructing representations of the image files by combining the representations of the regions in the first set of regions, partitioning the representations of the image files into a second set of regions, and determining a second set of machine learned model parameters based on the second set of regions, the second set of machine learned model parameters representing a second level of patterns in the image files.

Abstract: The present invention provides a Mitrecin A polypeptide useful in prevention and treatment of one or more bacteria. Also provided is a method to kill or prevent growth of one or more bacteria comprising contacting the one or more bacteria with a Mitrecin A polypeptide. The target bacteria can be selected from the group consisting of a Gram-positive bacterium, a Gram-negative bacterium, or both. In one embodiment, the present invention is drawn to a polynucleotide encoding a Mitrecin A polypeptide, a vector comprising the polynucleotide, a host cell comprising the polynucleotide, or a composition comprising the Mitrecin A polypeptide, the polynucleotide, the vector, or the host cell.