Research Electronics International, LLC

Other

Thomas H Jones

Bruce R Barsumian

Ross Alan Binkley

Todd Louis Green

Charles Andrew Liter

Sean Michael Kelly

Darrell L Harmon

Michael Miller

A system and method for detecting unmanned aerial vehicles (UAV) includes capturing a set of wireless data traffic from a wireless transmission and performing frequency spectrum analysis on datagram arrival times to classify the wireless data traffic based upon potential constant-datagram-rate data content that may be indicative that at least a portion of the wireless data traffic is emanating from a UAV. The wireless data traffic may be captured from one or more Wi-Fi receivers and sorted based upon transmission parameters prior to performing the frequency spectrum analysis. Detected peak frequencies may be used to determine if any constant-datagram-rate traffic within the wireless data traffic potentially contains data traffic streaming from a UAV. Directional antennas and/or a phased array of antennas can be used to determine the direction of propagation of the wireless transmission and further classify the wireless data traffic based on potential emanation from a UAV.

System and method for detecting constant-datagram-rate network traffic indicative of an unmanned aerial vehicle

A system and method of classifying a set of internet protocol network data traffic based upon potential constant-datagram-rate data content such as VoIP traffic or streaming video using frequency spectrum analysis of datagram arrival times is disclosed. The network data traffic is captured with an apparatus connected in-line on the network link from which the set of network data traffic is obtained or wirelessly from a wireless network transmission. The network data traffic is presorted based upon parameters such as the media access control-layer, datagram size, IP address, port number or transport-layer protocol to limit the required analysis. A threshold function is used to detect peaks in the calculated frequency spectrum that indicate constant-datagram-rate traffic. An automated system preferably captures the network data traffic, immediately performs the frequency spectrum analysis on the captured data traffic, and stores the analysis results in memory for later access.

System and method for detecting constant-datagram-rate network traffic

A graphical display for displaying spectrum analyzer data that represents detected signal levels for frequencies in an identified frequency span includes a signal level axis that represents a range of detected RF signal levels for the spectrum analyzer data and a frequency axis that represents an identified frequency spectrum span for the spectrum analyzer data. Frequency ranges in the identified frequency span having a high concentration of detected RF energy are automatically graphically expanded and displayed on the frequency axis of the graphical display while frequency ranges having a lower concentration of detected RF energy are simultaneously, automatically graphically condensed and displayed on the first frequency axis of the graphical display.

Expanded detail graphical display for spectrum analyzers

A spectrum analyzer contains a number of improvements that adapt it to common commercial uses. The spectrum analyzer is capable of automatically wirelessly receiving and synchronizing frequency spectrum data collected from multiple remote spectrum analyzers with respect to frequency, time and location. A selector function is used to create composite frequency data sets from multiple frequency data sets while allowing retroactive identification and examination of the original frequency data. An improved non-linear graphical display of the frequency spectrum data is created by automatically expanding the resolution of frequency axis for frequency ranges having signals of interest and contracting the resolution of the frequency axis of frequency ranges having no signals of interest.

Data management with spectrum analyzers

A system and method of classifying a set of internet protocol network data traffic as likely or unlikely to contain constant-packet-rate data or VoIP traffic using frequency spectrum analysis of data packet arrival times. The method is performed with an apparatus connected in-line on the network link from which the set of network data traffic is obtained. The network data traffic is presorted by packet size, source IP address, destination IP address, source port number, destination port number, or transport-layer protocol to limit the required analysis. A sliding window function is used to provide the time-domain input data to the frequency spectrum analysis. A threshold function is used to detect peaks in the calculated frequency spectrum that indicate constant-packet-rate traffic. An automated system preferably captures the network data traffic from one or more network links, immediately performs the frequency spectrum analysis on the data traffic and stores the results in memory for later access.

System and method for detecting VOIP traffic

A digital spread spectrum non-linear junction detector (NLJD) utilizes the 2.4 GHz transmission band to increase sensitivity to detect smaller electronics. The receiver chain of the NLJD pre-distorts the transmission signal and correlates the result with the response signal to differentiate between target responses and ambient interference signals. A touch screen display displays a signal strength received by the NLJDs receiver at a second harmonic frequency of the 2.4 GHz transmit signal and a signal strength received by the receiver at a third harmonic frequency of the transmit signal. A frequency swept response received by the receiver in response to the transmitted 2.4 GHz transmit signal is graphically displayed on the touch screen. The use of the 2.4 GHz band, touch screen, correlation based target differentiation and frequency swept response display improve the sensitivity and usability of the NLJD and increase the likelihood of it successfully performing its tasks.

Spread spectrum non-linear junction detector

The safety device provides an added measure of safety to striker fired semi-automatic pistols. The safety device includes a contact member in the form of a sliding bar or pivoting lever, that is movable between an engaged position and a disengaged position, such that the contact member operatively blocks the movement of one of the fire control mechanism components to prevent discharge of the weapon but only when the contact member is manually held in an engaged position. The user manipulates and physically holds the contact member in its engaged position by pressing a thumb plate or button located at the rear of the slide. Safety devices of this invention only affect the fire control mechanism of the pistol while the user actively engages, that is physically presses, on the thumb plate or button of the safety device to move the contact member into its engagement position, and must physically maintain pressure on the thumb plate in order to hold the contact member in its engaged position to block the movement of the fire control components.

Safety device for a striker fired weapon

A method, device, and apparatus for tracing a conductive line and locating any concealed surveillance devices coupled to the line uses a signal generator to produce a test signal having a fundamental frequency which is coupled to the line under test. The test signal flowing through the line under test creates electromagnetic waves that propagate through the atmosphere away from the line. A portable locator probe is used to detect the radiated signal and thus the conductive line by detecting the magnitude of the radiated signal. As the locator probe is moved closer to the line, the amplitude of the detected signal increases. In addition, the portable locator probe detects harmonic signals radiated from nonlinear junctions coupled to the line at harmonic frequencies of the fundamental test signal. By examining the relative strengths of the second and third harmonic signals, a user can determine if the detected non-linear junction is being produced by a semiconductor or a corrosive/dissimilar metal type non-linear junction. A DC bias voltage can be used to improve the responses of any semiconductor based non-linear junctions. Any semiconductor junctions located with the probe are manually examined to determine the cause of the non-linear junction.

Line tracing method and apparatus utilizing non-linear junction detecting locator probe

Line anomalies on a line under test are detected by generating a test signal at a first power level and coupling the test signal to the line under test. A response level is received from the line under test at a second and third harmonic frequency of the first test signal. A second test signal is generated at an increased power level and coupled to the line under test and a response level from the line is received at a second and third harmonic frequency of the second test signal. The process is repeated by raising the power level of the test signal until a current level supplied to the line by a test signal exceeds an acceptable threshold level. The response levels are compared to stored data to locate any line anomalies present. The stored data represents harmonic response data obtained from the same line at a previous time. A graphical or mathematical representation of the response data is produced such that the response data can be easily compared to locate any anomalies.

Non-linear junction based electronics detection

An apparatus for detecting concealed surveillance devices coupled to a transmission line uses either a time domain or frequency domain reflectometry operation to locate any impedance anomalies on the transmission line and a non-linear junction detection operation to classify the located impedance anomalies as semiconductor or non-semiconductor based anomalies. The reflectometry operation utilizes the reflection of a test signal to determine the distance to any reflecting impedance anomalies on the transmission line that may be indicative of an electronic device being coupled to the transmission line. The non-linear junction detection operation then compares the amplitudes of re-radiated second and third harmonics of a transmitted fundamental frequency signal to determine if the reflecting impedance anomalies are the result of a semiconductor based non-linear junction. A DC bias voltage and a balanced load may be added to the transmission line to enhance the line's response to the test signals. Any unidentified semiconductor based anomalies are manually inspected to determine if they represent convert surveillance devices.

Surveillance device detection utilizing non linear junction detection and reflectometry

An improved method and system for detecting covert surveillance devices uses frequency spectrum traces produced by a spectrum analyzer. The electromagnetic spectrum is scanned in a reference area to produce a reference frequency spectrum trace. The electromagnetic spectrum is then continuously scanned in a nearby target area to produce a peak hold frequency spectrum trace. The reference frequency spectrum trace is then subtracted from the peak hold spectrum trace to produce a comparative frequency spectrum trace. Peaks in the comparative frequency spectrum correspond to signals that are unique to either the reference area or the target area or transitory in nature. Statistical analysis is performed on subsequently obtained frequency traces to identify any changes in the frequency traces.

Comparative spectrum trace method and apparatus for detecting transmitters

A new correlation process and implementing apparatus for use in detecting the presence and location of a concealed eavesdropping device is disclosed in the present application. The process correlates a demodulated intercepted signal with a reference signal that corresponds to the sounds present in an environment of interest. A high correlation between the demodulated intercepted signal and the reference signal indicates that the demodulated intercepted signal corresponds to the audio in the environment of interest. An improved Correlation process is implemented using Fast Fourier Transforms to calculate a figure of merit based upon correlation data determined from sampled versions of the reference and intercept signals. The improved process and apparatus further provides a range to the detected surveillance device and multiple range measurements may be used to triangulate on the surveillance device to determine its precise location.

Correlation method for surveillance device detection

A non-linear junction detector designed for counter surveillance measures achieves superior performance by transmitting a series of pulses and receiving harmonics of the transmitted pulse signals that are re-radiated by a non-linear junction such as would be found in an eavesdropping device containing a semiconductor. The transmit power of the series of pulses is varied and the amplitudes of the harmonics received at the different power levels are compared to determine the type of non-linear junction detected. The received harmonic signals are demodulated to create signals having a frequency in the audible range of human ears. The demodulated signals are broadcast so that an operator of the non-linear junction detector can audibly distinguish between the noise responses produced by the different types of non-linear junctions. The harmonic signals are analyzed to determine if the harmonic, signals correspond to signals produced by a known type of non-linear junction device such as a video camera or tape recorder. Data generated by the non-linear junction detector is displayed to an operator of the detector and may be stored for later analysis.

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Cookeville, TN, United States of America

Thomas H Jones