Geolocating an emitter of a low probability of detection (LPD) signal being transmitted from the emitter in an environment with a noise floor, where the LPD signal is below the noise floor. At a sensor node, a version of the LPD signal is received from the emitter. For the version of the LPD signal, cyclostationary feature detection or energy detection of the version of the LPD signal is performed. A low probability of detection descriptor word, including at least one of a frequency feature of the version of the LPD signal or an energy feature of the version of the LPD signal is created. The low probability of detection descriptor word is provided to a data processor, where the data processor is configured to use a plurality of low probability of detection descriptor words from different sensor nodes for different versions of the LPD signal to geolocate the emitter.

A gunshot detection system utilizes an ultrasonic transducer for detecting a blast wave resulting from a gunshot. The system may be linked to alert systems configured for notifying emergency response personnel to the occurrence and location of a gunshot, thereby enabling a rapid response to an active shooter situation.

A method and apparatus for receiving signals from an unknown transmitting source and providing the location of the unknown transmitting source comprising a series of channels for receiving signals radiated by the unknown transmitting sources, generating preprocessed time domain data and generating a SAR image depicting a location of the unknown transmitting source, and a processor for processing the preprocessed time domain data to enhance a pixel value at each pixel location within the SAR image by summing signal data from each channel related to each pixel location to generate an enhanced SAR image.

An unmanned aerial system (UAS) detection device includes a sensor having programmed instructions to cause the sensor to scan energy in an electromagnetic spectrum; process the energy in the electromagnetic spectrum into bursts; determine whether the bursts are valid UAS bursts based on burst criteria; and correlate the bursts into a single signal.

Provided is a technology for increasing accuracy of position estimation by estimating a position of a signal source based on an error due to altitudes of a sensor and a signal source and an error due to a pitch of an aircraft as well as an error due to curvature of the earth. At this time, a position estimation method may include receiving measurement data from a plurality of sensors, estimating first position data of the signal source based on the measurement data, identifying an altitude error of the first position data, and estimating second position data that is data obtained by correcting the first position data based on the altitude error.

Disclosed are methods and systems for detection of a discharge of a projectile from a firearm. An example method for detection of a discharge of a projectile from a firearm may commence with recording environmental audio by at least one microphone associated with at least one electronic device. The method may continue with triggering, by a processing unit associated with the at least one electronic device, based on predetermined triggering criteria, a frequency analysis of the environmental audio. The analysis may be performed to determine a likelihood of the projectile being discharged from the firearm. The method may further include transferring, by a data transfer unit associated with the at least one electronic device, results of the frequency analysis from the at least one electronic device to a data storage unit for post-processing.

A device for determining a firing position from which a projectile has been fired at a target object is proposed, comprising: at least one sensor unit for detecting an impact of the projectile in the target object, at least one acoustic sensor unit for detecting a muzzle blast when the projectile is fired, and a determination unit which is arranged to determine the firing position on the basis of the detected muzzle blast and the detected impact.

A system and method of locating a target and presenting the location via augmented reality. The inventive subject matter includes a projectile that can transmit information including location information to other computing devices. These computing devices can then use the location information to determine the relative location of the projectile relative to the computing device and generate a visual representation of the location of the projectile on an augmented reality display such that the location of the target is overlaid over a real-world view through the display.

A computerized system is configured to detect optical and acoustic events. It is operatively coupled to optical sensor(s) and acoustic sensor(s). It comprises a processing circuitry configured to perform the following: (a) receiving optical data from the optical sensor(s), indicative of optical event(s) associated with an event source(s). (b) receiving acoustic data from the acoustic sensor, indicative of acoustic event(s) associated with the event source. The optical sensor and the acoustic sensor are time-synchronized. (c) identifying the optical and acoustic events, based at least on the optical and acoustic data, (d) determining at least one of: distance and direction of the event source, relative to one or more of the optical sensor and the acoustic sensor. The determination is based at least on the optical event, the acoustic event, the optical data and the acoustic data.

Disclosed is a Global Positioning System (GPS) independent navigation system (GINS) for a self-guided aerial vehicle (SAV). The SAV has a housing, where the housing has an outer surface, a length, a front-end, and a longitudinal axis along the length of the housing. The GINS includes a first optical sensor, a second optical sensor, a storage unit, and a comparator.