One embodiment provides a line of sight detector. The line of sight detector includes a first TeraFET (field effect transistor) including a first source, a first drain, a first gate, and a first channel having a first end and a second end. The line of sight detector further includes a first source antenna coupled to the first source; a first drain antenna coupled to the first drain; and a third antenna. Each antenna is configured to receive an incident radiation signal having a frequency in a sub terahertz or a terahertz frequency range. Each antenna is positioned a respective distance from each other antenna. Each distance is less than one wavelength of the incident radiation signal.

A direction finding system including a gradient index lens having a plurality of stacked dielectric plates with through holes causing a gradual variation of a refractive index across a diameter of each of the plurality of stacked dielectric plates. A plurality of antennas located around a section of a perimeter of the gradient index lens. The variation of the refractive index in each of the plurality of stacked dielectric plates causes the gradient index lens to direct a radio frequency (RF) signal received by the gradient index lens towards a target antenna of the plurality of antennas. An RF processing system is configured to process an RF signal received by the plurality of antennas and determine a direction of arrival of the RF signal based on a location of the target antenna of the plurality of antennas that outputs the received signal strength above a threshold.

A portable multifunctional detection instrument is provided. The portable multifunctional detection instrument includes a housing. The housing is provided with a handheld part. A control circuit board is disposed in the housing. An infrared detector and a red light generator are disposed on the housing. Both the infrared detector and the red light generator are electrically connected to the control circuit board. The infrared detector is configured to detect red light emitted by a camera. The red light generator is configured to emit red light toward the camera. The control circuit board is further provided with a signal detection module to detect whether a communication signal exists around.

Systems and methods are provided for a digital beamformed phased array feed. The system may include a radome configured to allow electromagnetic waves to propagate; a multi-band software defined antenna array tile; a power and clock management subsystem configured to manage power and time of operation; a thermal management subsystem configured to dissipate heat generated by the multi-band software defined antenna array tile; and an enclosure assembly. The multi-band software defined antenna array tile may include a plurality of coupled dipole array antenna elements; a plurality of frequency converters; and a plurality of digital beamformers.

A geolocation system for efficiently reconstructing and geolocating signals collected in multiple spatially-distributed sensors using a plurality of different Nyquist-folding samplers operating at sub-Nyquist rates. The sensors use Nyquist-folding with a plurality of sampling rates and patterns to reduce the volume of data transmitted off the sensor while retaining the ability to detect weak signals, and produce high-quality signal reconstructions and geolocations. The ambiguities in signal reconstruction introduced by sub-Nyquist sampling are addressed by using spatial consistency computed from sub-Nyquist geo-observables to assist in RF ambiguity resolution.

A navigation system and method for guiding a vehicle with respect to a source of jamming is disclosed, the system and method being capable of receiving navigation-aid signals, detecting jamming of such signals, mitigating such jamming, determining direction to the source of jamming, and interdicting that source, e.g., a drone gun.

Systems and methods are provided for a digital beamformed phased array feed. The system may include a radome configured to allow electromagnetic waves to propagate; a multi-band software defined antenna array tile; a power and clock management subsystem configured to manage power and time of operation; a thermal management subsystem configured to dissipate heat generated by the multi-band software defined antenna array tile; and an enclosure assembly. The multi-band software defined antenna array tile may include a plurality of coupled dipole array antenna elements; a plurality of frequency converters; and a plurality of digital beamformers.

Systems and methods are described to determine a direction and distance from a participant unit to a guide unit as both the participant unit and guide units move. The participant unit determines the direction and distance and based thereon generates an output to various sensory elements worn or used by the participant to indicate those values dynamically to the participant.

Systems and methods are provided for a digital beamformed phased array feed. The system may include a radome configured to allow electromagnetic waves to propagate; a multi-band software defined antenna array tile; a power and clock management subsystem configured to manage power and time of operation; a thermal management subsystem configured to dissipate heat generated by the multi-band software defined antenna array tile; and an enclosure assembly. The multi-band software defined antenna array tile may include a plurality of coupled dipole array antenna elements; a plurality of frequency converters; and a plurality of digital beamformers.

Systems and methods for automated unmanned aerial vehicle recognition. A multiplicity of receivers captures RF data and transmits the RF data to at least one node device. The at least one node device comprises a signal processing engine, a detection engine, a classification engine, and a direction finding engine. The at least one node device is configured with an artificial intelligence algorithm. The detection engine and classification engine are trained to detect and classify signals from unmanned vehicles and their controllers based on processed data from the signal processing engine. The direction finding engine is operable to provide lines of bearing for detected unmanned vehicles.