Abstract: A high-frequency beyond line of sight ad-hoc communication system is disclosed. In embodiments, the system includes an originating node. The originating node is configured to transmit a transmission. In, the system includes a destination node. The destination node is configured to receive the transmission using one or more antennas. In, the system includes one or more relay nodes, which are configured to relay the transmission from the operating mode to the destination mode in a time diverse manner. The relay nodes further comprise a controller, configured to facilitate high-frequency beyond line of sight communication between the originating node and the destination node, wherein the transmission is carried in accordance with a TDMA based waveform that supports frames and time slots. In embodiments, the one or more relay nodes are further configured to relay the transmission from the originating mode to the destination mode in a frequency diverse manner.

Abstract: A high-frequency beyond line of sight ad-hoc communication system is disclosed. In embodiments, the system includes an originating node. The originating node is configured to transmit a transmission. In, the system includes a destination node. The destination node is configured to receive the transmission using one or more antennas. In, the system includes one or more relay nodes, which are configured to relay the transmission from the operating mode to the destination mode in a time diverse manner. The relay nodes further comprise a controller, configured to facilitate high-frequency beyond line of sight communication between the originating node and the destination node, wherein the transmission is carried in accordance with a TDMA based waveform that supports frames and time slots. In embodiments, the one or more relay nodes are further configured to relay the transmission from the originating mode to the destination mode in a frequency diverse manner.

Abstract: A communication system including a transmit antenna that transmits an output signal including output information, a network interface that receives state data regarding a first remote platform, and a processing circuit. The processing circuit predicts a performance of a communication link that the transmit antenna uses to transmit the output signal based on the state data, evaluates a performance condition based on the estimated performance and a threshold performance, responsive to the performance condition being satisfied, uses the transmit antenna to transmit the output signal, and responsive to the performance condition not being satisfied, at least one of (i) adjusts at least one of a time parameter or a frequency parameter that the transmit antenna uses to transmit the output signal, or (ii) provide an instruction to a second remote platform to cause the second remote platform to transmit the output information to the first remote platform.

Abstract: A method includes determining that a first receiver of a node of a mobile ad-hoc network (MANET) is in an electromagnetic contested environment for a first frequency. The method also includes scanning a frequency coverage range of a second receiver of the node for unused frequencies. The method additionally includes selecting a frequency from the unused frequencies, the selected frequency to be used for communication of messages from another node of the MANET to the node via the second receiver. The method further includes transmitting, to the other node, a message including information of the selected frequency via the transmitter.

Abstract: Frequency management methods and communication networks utilizing such frequency management methods are disclosed. More specifically, multiple frequency sets may be utilized to facilitate frequency hopping and a frequency management method may implement various switching schemes to switch between the different frequency sets. Techniques such as synchronization and spectrum harvesting may also be provided to support utilization of multiple frequency sets, all of which may provide improved operation reliabilities and better handling of jamming signals.

Abstract: High frequency (HF) communication devices and methods capable of supporting HF tactical communications are disclosed. A communication device may include a time source configured to provide timing information for the communication device, where the timing information is synchronized with other communication devices participating in the same network the communication device is configured to participate in. The communication device may also include one or more processors in communication with the time source. The one or more processors may be configured to facilitate beyond line of sight reflective communications between the communication device and another communication device participating in the same network, wherein the beyond line of sight reflective communications are carried out in a time synchronized manner and in accordance with a time division multiple access (TDMA) based waveform that supports time slots.

Abstract: Spectrum harvesting methods and spectrum harvesters implementing such spectrum harvesting methods are disclosed. In some embodiments, multiple spectrum harvesters may be configured to scan a frequency band of interest in a distributed and staggered manner. The results obtained by the spectrum harvesters may be shared with each other according to a round-robin scheme. Distributed scanning and round-robin sharing techniques configured in accordance with the inventive concepts disclosed herein may allow the spectrum harvesters to jointly function as a continuous spectrum scanner capable of providing near real time spectrum harvesting.

Abstract: A communication network includes and a communication method uses a communication node configured to use a time division multiple access protocol to allow communication in the network. The time division multiple access protocol is configured to allocate time slots. The communication node includes a main transceiver and an auxiliary transceiver. The communication node is configured to listen for a synchronization signal using the main transceiver during a first window and to listen for a synchronization signal during a second window using the auxiliary transceiver.

Abstract: Radios configured to operate in a satellite-based mobile user system and methods configured to support seamless beam and satellite handoff of such radios are disclosed. A radio may include a receiver, a transmitter, and one or more receiver-exciter in communication with the receiver and the transmitter. The receiver-exciter may include a bi-directional path configured to support radio communications and a receive-only path configured to receive signals on all frequencies utilized by a mobile user system. The radio may further include one or more waveform processor in communication with the receiver-exciter. The waveform processor may be configured to: digitize signals received on all frequencies utilized by the mobile user system; separate the signals into multiple channels; estimate quality measurements for the multiple channels; select a channel from the multiple channels based on the quality measurements; and establish a connection with the mobile user system using the selected channel.

Abstract: The present invention is a method for tactical spectrum harvesting via a cognitive communication device. The method may include monitoring a wireless communication frequency spectrum. The method may further include detecting active net communication transmissions. The active net communication transmissions may be transmitted via the monitored communication frequency spectrum by a plurality of active transmitting nets. The method may further include determining an identity of/identifying at least one active transmitting net included in the plurality of active transmitting nets. The method may further include synchronizing an internal time reference of the cognitive communication device with a time reference(s) of the identified active transmitting net(s).

Abstract: A method includes determining that a first receiver of a node of a mobile ad-hoc network (MANET) is in an electromagnetic contested environment for a first frequency. The method also includes scanning a frequency coverage range of a second receiver of the node for unused frequencies. The method additionally includes selecting a frequency from the unused frequencies, the selected frequency to be used for communication of messages from another node of the MANET to the node via the second receiver. The method further includes transmitting, to the other node, a message including information of the selected frequency via the transmitter.

Abstract: Frequency management methods and communication networks utilizing such frequency management methods are disclosed. More specifically, multiple frequency sets may be utilized to facilitate frequency hopping and a frequency management method may implement various switching schemes to switch between the different frequency sets. Techniques such as synchronization and spectrum harvesting may also be provided to support utilization of multiple frequency sets, all of which may provide improved operation reliabilities and better handling of jamming signals.

Abstract: A system and method for ad-hoc beyond line of sight high frequency (HF) radio frequency communication is disclosed. Embodiments of the present invention may augment the HF waveform incorporated with Advanced automatic link establishment (A2LE) to determine relay-hop paths between a plurality of HF nodes. Systems herein may setup and teardown bi-directional one hop HF communication sessions between two HF nodes having RF connectivity directly as well as through an intermediary relay node. Additionally, the setup and teardown may include bi-directional relay hop HF communication sessions between two HF nodes through multiple intermediary relay nodes. In performing the bi-directional relay hop HF communication sessions, systems herein may select a relay node, perform automatic link monitoring and link re-establishment, support message store and forward, and route HF communication along a path around potential barriers to communication (e.g., nuclear scintillation, solar flares, and coronal mass events).

Abstract: A radio node in a radio network includes signal processing hardware. The radio node includes radio frequency (RF) transceiver hardware. The radio node also includes a spectrum sensor configured to detect potential spectrum policy violations. Further, the radio node includes a non-cooperation discriminator used to determine the non-cooperative character of a monitored radio node.

Abstract: A system for reducing operational power and weight of an unmanned aerial device's payload may include a frequency detection sensor for detecting a radio frequency signal within a first frequency range. A modulation detection and waveform classification module may be coupled to the frequency detection sensor for detecting a communication type associated with the first frequency range upon the frequency detection sensor detecting the radio frequency signal within the first frequency range. A radio may be coupled to the modulation detection and waveform classification module for transmitting the radio frequency signal, the radio frequency signal may include the communication type. The radio may be inactive until detection of the radio frequency signal, and the radio may be activated upon detection of the radio frequency signal.

Abstract: An electronic device is described. The electronic device includes a circuit chip. The electronic device also includes a coating covering at least a portion of the circuit chip. The coating further includes a nanomaterial, to protect the circuit chip from at least one of identifying the chip structure, reading memory locations, or modifying memory locations.

Abstract: A radio node in a radio network is disclosed. The radio node also includes signal processing hardware. The radio node also includes radio frequency (RF) transceiver hardware. Further, the radio node includes a smart spectrum sensor for feature detection capable of detecting multiple features including at least one of specific pilot signals, specific modulations, spectral widths, and symbol durations.

Abstract: The present invention is directed to a radio system for providing dynamic switching between red side control functionality and black side control functionality. The system may include a control processor configured for providing the black side control functionality. The system may also include a protected core processor configured for providing the red side control functionality. The system may further include a switch configured for selectively connecting external control elements to the control processor and/or the protected core processor for allowing the control processor and/or the protected core processor to control the external control elements.

Abstract: Situational awareness enhancement is promoted in a radio communication transceiver receiving non-verbal content and verbal content from a remote source. A vocoder communicatively coupled with the transceiver receives the verbal content packets, and a situational awareness encoder/decoder communicatively coupled with the transceiver receives the non-verbal content packets. The encoder/decoder links and synchronizes the verbal content packets with the corresponding non-verbal content packets, and provides the verbal content packets to the vocoder in parallel with the provision of the non-verbal content packets to the encoder/decoder. The non-verbal and verbal content is extracted from the respective packets and are synchronously output for display and playback, respectively.

Abstract: A multipath enhancer is disclosed ias including more than one antenna. At least one of a receiver and a transmitter is coupled to the more than one antenna. A selectively reflective surface is adjacent the more than one antenna. A controller is configured to alter the reflectivity of the selectively reflective surface.