An apparatus and method are described for processing a global navigation satellite system (GNSS) signal, the GNSS comprising multiple satellites, wherein each satellite transmits a respective navigation signal containing a spreading code. The method comprises receiving an incoming signal at a receiver, wherein the incoming signal may contain navigation signals from one or more satellites; encrypting the incoming signal at the receiver using a homomorphic encryption scheme to form an encrypted signal; and transmitting the encrypted signal from the receiver to a remote server.

System and method for concurrently protecting Iridium and GPS L1/L2 band received satellite signals against interference signals (e.g., jamming signals) using space-time adaptive processing (STAP). While the GPS signal is protected against jamming using Nulling of the interfering signals, the Iridium signal is protected using Beamforming. A single broadband small controlled reception pattern antenna (sCRPA) array receives both the GPS (L1 and L2) and Iridium signals for the STAP-based antijam solutions outputting filtered Iridium and GPS signals. Use of a common (small) broadband antenna and common front end signal processing of the received signals enables an integrated system for use on size, weight, and power constrained platforms such as drones, unmanned aerial vehicles (UAVs), and helicopters.

A quantum photonic imaging device used in an underwater vehicle for stealthy detection of underwater objects includes a photon generating module that generates an entangled pair of photons that includes a signal photon and an ancilla photon, wherein the ancilla photon is retained within the device; a transmitter that transmits the signal photon towards a region of space for detecting an underwater object; a receiver that detects an incoming photon to the device; and a correlation module that distinguishes the signal photon that is reflected back to the receiver due to a presence of the object from environmental noise photons, wherein the distinguishing includes determining an entanglement correlation of the detected photon with the ancilla photon, and wherein a presence of the entanglement correlation between the detected photon and the ancilla photon indicates that the detected photon is the signal photon reflected back from the object.

A method for determining a spatial orientation of a body, including receiving, by receiving equipment located with the body, at least three electromagnetic signal sets, each of the received signal sets having been transmitted by a different one of at least three separate transmitters at different locations, detecting, for each one of the received signal sets, information that partially defines a direction from the body to the transmitter from which the signal set was received, the detected information including one of two angles that fully define an arrival direction from which the body received the signal set in relation to a body frame, the detected information not including a second of the two angles, and determining the spatial orientation of the body, including yaw, pitch, and roll angles relative to a navigation frame, using the detected information for each one of the received signal sets.

Systems and methods are provided for firearm monitoring, including a server device running application software that receives signals from firearms regarding usage thereof and a controller running application software configured to communicate with a connected device via a communication interface, detect a jamming signal that inhibits communication with the connected device, stop, in response to detecting the jamming signal, communication with the connected device, and harvest, in response to detecting the jamming signal, power from the jamming signal via a wireless-energy harvesting mechanism having a receiving antenna configured to receive the jamming signal, a rectifier configured to convert the received signal to direct current, and a DC-DC converter configured to alter voltage of the direct current to a desired voltage.

Systems and methods are provided for firearm event monitoring, including an inertial measurement unit and a hall-effect sensor mounted on a firearm, a server device running application software that receives signals from the inertial measurement unit and the hall-effect sensor, and a machine learning module configured to create and run identification algorithms, using data derived from the received signals from the inertial measurement unit and the hall-effect sensor indicative of a discharge event type, wherein the discharge event type is one of an ammunition discharge event, a misfire discharge event or a dry-fire discharge event.

The invention concerns a method of communication between a monitoring system (61) monitoring a roaming entity and an electronic communication tracking device (TR) linked to the roaming entity. The method includes the following steps: obtaining the current geographical position of the tracker (TR) by indirect geolocation and transmit this to the monitoring system (61); comparing the current geographical position that has been obtained with cartographic data of areas associated with restricted communication, in the event of a match, stopping indirect geolocation; measuring and recording at least one of the tracker's (TR) environmental factors in order to determine an environmental change relating to the end of roaming within the area of restricted communication; starting satellite geolocation and comparing the position that has been obtained with cartographic data of areas associated with authorized communication, if an environmental change is determined relating to the end of roaming; and restarting indirect geolocation if there is a match.

The system and method for dynamic mode forming for a global positioning/global navigation system. The system having a controlled reception pattern antenna (CRPA) mounted on a platform; an antenna electronics subsystem configured for dynamically maximizing gain in the controlled reception pattern antenna; and a global positioning/global navigation receiver subsystem configured for null processing, wherein a state of the platform is used to modify a reference mode and a plurality of auxiliary modes for the controlled reception pattern antenna in real-time based on an apriori look up table (LUT) to dynamically maximize a gain of the controlled reception pattern antenna.

The system and method for dynamic mode forming for a global positioning/global navigation system. The system having a controlled reception pattern antenna (CRPA) mounted on a platform; an antenna electronics subsystem configured for dynamically maximizing gain in the controlled reception pattern antenna; and a global positioning/global navigation receiver subsystem configured for null processing, wherein a state of the platform is used to modify a reference mode and a plurality of auxiliary modes for the controlled reception pattern antenna in real-time based on an apriori look up table (LUT) to dynamically maximize a gain of the controlled reception pattern antenna.

System and method for concurrent STAP (space-time adaptive processing) filtering of interference signals (e.g., jamming signals) from signals received at a broadband antenna array via satellite and terrestrial broadcasts and communication systems operating in the 950 MHz to 1.65 GHz L-band, including but not limited to Link 16 terrestrial communications, Iridium satellite communications, and the Global Positioning System (GPS) and other Global Navigation Satellite Systems (GNSS). While the GPS/GNSS signals are protected against jamming using Nulling of the interfering signals, the Iridium and other communication systems' signals are protected using Beamforming. Use of a common broadband antenna and common front-end signal processing of the received signals enables an integrated system for use on a wide range of platforms, including without limitation size-, weight-, and power-constrained platforms such as drones, unmanned aerial vehicles (UAVs), and helicopters.