Abstract: Methods and systems are provided for managing potential conflicts between entities operating within a three-dimensional volume of navigable space, such as different aircraft operating within navigable airspace. One method involves obtaining usage information associated with a first entity, mapping the usage information to one or more partitions in a partitioned domain corresponding to the volume of navigable space that encompass an operating region for the first entity, and updating registered usage data associated with the one or more partitions to maintain an association between the one or more partitions and the first entity. The method detects a concurrent usage conflict associated with a first partition after updating the registered usage data based at least in part on a second association between the first partition and a second entity, and in response to detecting the concurrent usage conflict, updates conflict data to include an indication of the concurrent usage conflict.

Abstract: The quantum communication system conveys information by exploiting quantum properties of photon streams. A photon source producing a pair of spatially separated and polarization-entangled photon streams is used. The pair collectively exist in a quantum superposition state by virtue of their mutual entanglement. An encoder establishes a modulation control signal corresponding to the information to be conveyed. An optical quantum circuit is placed in the path of one of the pair of streams, so that the first stream passes through it. The optical quantum circuit alters the quantum polarization state of the photon passing through it based on the control signal. In this way information is encoded into quantum probability distributions of the superposition state through quantum parallelism and quantum interference, whereby information is conveyed in the photon streams.

Abstract: A configurable antenna for a software defined radio including a first antenna unit having a first antenna element for receiving a first electromagnetic signal in a first frequency band wherein the first frequency band corresponds to a first mode of operation of a software defined radio, an interface unit having a first connector to couple the first electromagnetic signal from the first antenna unit and a second connector to couple the first electromagnetic signal to the software defined radio, an enclosure configured to receive the interface unit within an internal cavity, and a retention bracket configured to mechanically retain the interface unit within the enclosure, the retention bracket having at least one hole for allowing the first connector to conductively contact the antenna unit.

Abstract: Systems and methods efficiently process digests, hashes or other results by performing multiplicative functions in parallel with each other. In various embodiments, successive processing stages are provided for calculating a plurality of powers of the common value, processing each of a plurality of pairs of first and second elements of the input values, wherein the processing comprises multiplying the first elements of the input values by the common value and combining the products with second elements of the input values, performing additional processing using the plurality of processed pairs as the subsequent set of input values and using a power of the common value, multiplying each of the processed pairs with one of the plurality of powers of the common value to generate a set of output values, accumulating the set of output values, and providing the digest as a function of the set of output values.

Abstract: The quantum relay and quantum signal source exploit quantum properties of photon streams. A pair of spatially separated and polarization-entangled photon streams is used. The pair collectively exist in a quantum superposition state by virtue of their mutual entanglement. In the relay, an encoder establishes a modulation control signal corresponding to the information to be conveyed. An optical quantum circuit is placed in the path of one of the pair of streams, so that the first stream passes through it. The optical quantum circuit alters the quantum polarization state of the photon passing through it based on the control signal. In this way information is encoded into quantum probability distributions of the superposition state through quantum parallelism and quantum interference, whereby information is conveyed in the photon streams.

Abstract: A communications system including a transmit processor for determining transmit and azimuth elevation in response to a refractive layer altitude, a transmitter array including a plurality of transmitters each for transmitting one of a plurality of transmitted signals in response to the transmit elevation wherein each of the plurality of transmitted signals is encoded using a data signal and one of a plurality of unique synchronization sequences, and a receiver for receiving the plurality of transmitted signals, isolating each of the plurality of transmitted signals in response to one of the plurality of unique synchronization sequences corresponding to each of the plurality of transmitted signals to generate a plurality of isolated signals, to combine the plurality of isolated signals to generate a combined signal and to generate the data signal in response to the combined signal.

Abstract: The quantum communication system conveys information by exploiting quantum properties of photon streams. A photon source producing a pair of spatially separated and polarization-entangled photon streams is used. The pair collectively exist in a quantum superposition state by virtue of their mutual entanglement. An encoder establishes a modulation control signal corresponding to the information to be conveyed. An optical quantum circuit is placed in the path of one of the pair of streams, so that the first stream passes through it. The optical quantum circuit alters the quantum polarization state of the photon passing through it based on the control signal. In this way information is encoded into quantum probability distributions of the superposition state through quantum parallelism and quantum interference, whereby information is conveyed in the photon streams.

Abstract: Communications systems and methods for communicating data are provided. In one example, the communications system includes an outer ring having an inner surface and an inner ring having an outer surface. The inner surface and the outer surface are separated by a gap that extends around the inner ring to define a loop. A modulating light arrangement receives data and produces modulated light. A first light diffusing optical fiber and a second light diffusing optical fiber are disposed on a first side of the gap and extend in the loop to define an optical data ring. The first light diffusing optical fiber and the second light diffusing optical fiber cooperate to diffuse the modulated light along the optical data ring. A detector is disposed on the second side of the gap and detects the diffuse modulated light.

Abstract: A conversion kit for installation into weapon to replace the service barrel with a sub-caliber barrel for firing reduced energy training cartridges. The conversion kit includes a barrel sleeve, a barrel support and a collet disposed between in the barrel support for fixedly securing the barrel sleeve therein. The collet is disposed in a double tapered bore formed in the barrel support for fixedly securing the barrel sleeve at both ends of the collet into the barrel support. A flash hider, which has been removed from the service barrel, is threadably received in the barrel support and functions as a collet nut for clamping the collet onto the barrel sleeve.

Abstract: A configurable antenna for a software defined radio including a first antenna unit having a first antenna element for receiving a first electromagnetic signal in a first frequency band wherein the first frequency band corresponds to a first mode of operation of a software defined radio, an interface unit having a first connector to couple the first electromagnetic signal from the first antenna unit and a second connector to couple the first electromagnetic signal to the software defined radio, an enclosure configured to receive the interface unit within an internal cavity, and a retention bracket configured to mechanically retain the interface unit within the enclosure, the retention bracket having at least one hole for allowing the first connector to conductively contact the antenna unit.

Abstract: The tracer projectile having a closure disk assembly is described. The tracer projectile includes a projectile base with a tracer cavity formed therein. A pyrotechnic charge is pressed into the tracer cavity and is ignitable by burning propellant such that a trajectory of the projectile is visible when fired. A closure disk assembly covers and seals the tracer cavity. A crown of the closure disk assembly is supported on a ring flange formed by an annular groove in the projectile base. A sidewall of the closure disk assembly surrounds the ring flange. A retaining element is disposed in the annular groove and engages a rim of the closure disk assembly for securing the closure disk assembly to the projectile base over the tracer cavity.

Abstract: The tracer projectile having a closure disk assembly is described. The tracer projectile includes a projectile base with a tracer cavity formed therein. A pyrotechnic charge is pressed into the tracer cavity and is ignitable by burning propellant such that a trajectory of the projectile is visible when fired. A closure disk assembly covers and seals the tracer cavity. A crown of the closure disk assembly is supported on a ring flange formed by an annular groove in the projectile base. A sidewall of the closure disk assembly surrounds the ring flange. A retaining element is disposed in the annular groove and engages a rim of the closure disk assembly for securing the closure disk assembly to the projectile base over the tracer cavity.

Abstract: Systems and methods are provided for generating solutions to decision analysis problems. The systems include a processor configured to: receive input data relating to a decision analysis problem, the input data including various parameters, wherein one or more of the parameters are in conflict, generate a plurality of the solutions based on the input data, wherein each of the plurality of solutions are from distinct homotopy classes, approximate a Pareto front using a multi-objective evolutionary algorithm, the Pareto front representing a collection of the plurality of the solutions that are not inferior to others of the plurality of the solutions in view of an entirety of the parameters in the input data, generate a course of action (COA) menu presenting solution architypes based on the Pareto front using a topological clustering algorithm, and display the COA menu on a visual display device.

Abstract: Small-, medium-, and large-caliber combustible cartridge cases and propellant combustible containers that are manufactured using reactive injection molding of azido polymers. An injection process for a single propellant combustible charge including the steps of: providing a quantity of azido bearing polymer; providing a quantity of curing agent; optionally providing a quantity of chemical blowing agent; optionally providing a quantity of fibers; optionally providing a quantity of additives and catalysts; and providing a mold defining a male cavity, a female cavity, and an injection port. The injection process further includes mixing together the azido bearing polymer, the curing agent, the optional chemical blowing agent, the optional fibers, the optional additives and catalysts, and injecting the resulting mixture into the mold.

Abstract: A direct drive drive actuator includes a base structure and a driven structure that is journally supported and translatable relative to the base structure. The driven structure is disposed in a fixed spatial relationship to the base structure. A plurality of first pole arrays is disposed on the driven structure. A plurality of second pole arrays, corresponding in number to the plurality of first pole arrays is disposed on the base structure. An electrical power source is provided. A controller is coupled to the power source and the first plurality of pole arrays and the second plurality of pole arrays, wherein the controller is configured to selectively electrically energized windings of the first plurality of pole arrays and the second plurality of pole arrays such that an electro-magnetic force is formed between poles of the first plurality of pole arrays and poles of the second plurality of pole arrays.

Abstract: A communications system including a transmit processor for determining transmit and azimuth elevation in response to a refractive layer altitude, a transmitter array including a plurality of transmitters each for transmitting one of a plurality of transmitted signals in response to the transmit elevation wherein each of the plurality of transmitted signals is encoded using a data signal and one of a plurality of unique synchronization sequences, and a receiver for receiving the plurality of transmitted signals, isolating each of the plurality of transmitted signals in response to one of the plurality of unique synchronization sequences corresponding to each of the plurality of transmitted signals to generate a plurality of isolated signals, to combine the plurality of isolated signals to generate a combined signal and to generate the data signal in response to the combined signal.

Abstract: Communications systems and methods for communicating data are provided. In one example, the communications system includes an outer ring having an inner surface and an inner ring having an outer surface. The inner surface and the outer surface are separated by a gap that extends around the inner ring to define a loop. A modulating light arrangement receives data and produces modulated light. A first light diffusing optical fiber and a second light diffusing optical fiber are disposed on a first side of the gap and extend in the loop to define an optical data ring. The first light diffusing optical fiber and the second light diffusing optical fiber cooperate to diffuse the modulated light along the optical data ring. A detector is disposed on the second side of the gap and detects the diffuse modulated light.

Abstract: The receiver captures an electromagnetic transmission carrying a bauded signal, such as a transmission from an orbiting satellite, and processes it for Doppler shift analysis. The electromagnetic transmission is captured and a non-linear operation is performed to expose a cyclostationary feature of the captured transmission that will define a rate-line. This rate-line will exist at a frequency that is related to the bauded signal and Doppler shift relative to the motion of the transmitter to the receiver. The rate-line frequency is tracked in time to generate data indicative of a Doppler shift associated with the satellite and processed by an estimator fed by satellite propagator to supply positioning, navigation and timing services at the receiver output.

Abstract: An electromagnetic transmission carrying a bauded signal, such as a transmission from an orbiting satellite, is processed for Doppler shift analysis. The electromagnetic transmission is captured and a non-linear operation is performed to expose a cyclostationary feature of the captured transmission that defines a rate-line having a rate-line frequency that is related to the bauded signal and to the motion of the transmitter relative to the receiver. The rate-line frequency is tracked in time to generate data indicative of Doppler shift associated with the satellite. The data are then supplied to a tracking receiver.

Abstract: The evolutionary feature selection algorithm is combined with model evaluation during training to learn feature subsets that maximize speech/non-speech distribution distances. The technique enables ensembling of low-cost models over similar features subspaces increases classification accuracy and has similar computational complexity in practice. Prior to training the models, feature analysis is conducted via an evolutionary feature selection algorithm which measures fitness for each feature subset in the population by its k-fold cross validation score. PCA and LDA based eigen-features are computed for each subset and fitted with a Gaussian Mixture Model from which combinations of feature subsets with Maximum Mean Discrepancy scores are obtained. During inference, the resulting features are extracted from the input signal and given as input to the trained neural networks.