A method in a wireless device comprises monitoring one or more aspects of signaling with a network for abnormal signals indicative of network jamming. The method comprises detecting, based on the monitored one or more aspects of signaling with the network, one or more abnormal signals indicative of network jamming.

A system and method provide automatic RF path gain calibration independent of RF interference levels to preserve solution trust capabilities. After a system is powered ON, or a new antenna is attached (hot swap), a smart antenna assembly combined with a jammer power estimator within an RF receiver functions to autonomously measure internal gains within the RF path, calibrate the new antenna installation, and thereby measure a level of interference associated with the external environment from that point forward. A controller commands the antenna calibration retrieving antenna details and RF path gain calibration while measuring local jamming at the receiver input. Should the controller determine a level of jamming effectiveness is present, it offers a user a display of the local jamming levels enabling the user accurate theater decision making regarding the accuracy and availability of desirable signal.

In the method, a first device receives a mixed signal including a target signal from a target device among a plurality of second devices and an interfering signal from the plurality of second devices. The first device determines a distribution characteristic of an amplitude of the mixed signal within an amplitude variation range, the distribution characteristic being associated with the target device and an interfering device generating the interfering signal. The first device determines the interfering device from the plurality of second devices based on the distribution characteristic. An interfering device in a communication system may be detected in real-time and accurately.

Methods and apparatus for providing a comprehensive decision support system to include predictions, recommendations with consequences and optimal follow-up actions in specific situations are described. Data is obtained from multiple disparate data sources, depending on the information deemed necessary for the situation being modeled. The decision support system provides a prediction or predictions and a recommendation or a choice of recommendations based on the correlative analysis and/or other analyses. Also described are methods and apparatus for developing application specific decision support models. The decision support model development process may include identifying multiple disparate data sources for retrieval of related information, selection of classification variables to be retrieved from the data sources, assignment of weights to each classification variable, selecting and/or defining rules, and selecting and/or defining analysis functions.

A system includes at least one reception unit installed in an aircraft and configured for tracking satellites of the satellite navigation system of the GNSS type. The system includes a generation unit for generating an expected number corresponding to the number of satellites that the reception unit is expected to track, a detection unit including a comparison part for comparing the expected number with a tracked number corresponding to the number of satellites that the reception unit is actually tracking and a decision part for detecting a jamming, as a function of the result of the comparison made by the comparison part and transmitting detection data in the event of detection, and a transmission unit configured to transmit jamming detection data to at least one user device, the system making it possible to detect a jamming of a GNSS system in an automatic and reliable manner.

An autonomously reconfigurable surface for adaptive antenna nulling includes a lattice of electrically conductive elements (which may be embodied as crossed metallic dipoles) mounted on a thin and preferably conformal surface and aperiodically loaded with reactance tuning elements and/or RF (and typically high power) sensing circuits. Additional elements mounted on this surface include analog to digital convertors (ADCs), digital to analog convertors (DACs), and microcontroller(s). The analog outputs of the DACs are networked to reactance tuning elements via, for example, a network of thin copper traces. The analog inputs of the ADCs are networked to the RF sensing circuits via a network, for example, of thin copper traces. The digital outputs of ADCs and the digital inputs of DACs are networked to microcontroller(s) via a network, for example, of thin copper traces. An embodiment of the adaptive nulling surface can be mounted over antennas and apertures as a retrofit antenna cover or as an overlay applied to existing radomes or over a new design antenna. Once exposed to a high power radio frequency radiation, this surface determines the direction of the incident high power source and adaptively adjusts the reactance of tuning elements in the surface to reconfigure the radiation pattern of the antenna which it is covering to place a null in the direction of the interference while allowing normal operation at other angles.

Techniques are disclosed for determining the presence of pulse jams in an identification friend or foe (IFF) system. In an embodiment, a plurality of jamming pulse rates are determined. Each of the plurality of jamming pulse rates is a count of jamming pulses entering the IFF system during a corresponding integration period. Each of the plurality of jamming pulse rates is a count of jamming pulses associated with non-valid signals entering the IFF system. An average jamming pulse rate is computed based on the plurality of jamming pulse rates. The average jamming pulse rate is then compared against a pulse jam threshold to determine whether a pulse jam is present (or not present) in the IFF system.

In one embodiment, possible voting nodes in a network are identified. The possible voting nodes each execute a classifier that is configured to select a label from among a plurality of labels based on a set of input features. A set of one or more eligible voting nodes is selected from among the possible voting nodes based on a network policy. Voting requests are then provided to the one or more eligible voting nodes that cause the one or more eligible voting nodes to select labels from among the plurality of labels. Votes are received from the eligible voting nodes that include the selected labels and are used to determine a voting result.

A high-frequency circuit includes a transmission circuit that transmits a high-frequency signal, a reception circuit that receives a high-frequency signal, and a multiplexer that separates a reception path and a transmission path for high-frequency signals. In the reception circuit, a filter circuit in which a first frequency response and a second frequency response different from the first frequency response can be switched in accordance with a jamming wave for a high-frequency signal to be received is provided in the reception path for a high-frequency signal.

A system for detecting GNSS signal jammers to be positioned on a roadside, the system comprises: a first device for receiving a GNSS signal; a second device that is configured to measure at least one characteristic of a received GNSS signal and to detect, on the basis of at least one characteristic, interference in the GNSS signal caused by a jamming signal; a third device for triggering the capture of an image of the road if the GNSS signal is subject to interference caused by a jamming signal, the first device configured to receive, via a radio link, a sequence of a satellite radionavigation signal received by a vehicle and retransmitted by the vehicle to the system via the radio link.