Abstract:
Methods and apparatuses for addressing open space noise are disclosed. In one example, a method for masking open space noise includes outputting from a speaker a speaker sound corresponding to a flow of water, and displaying a water element system, the water element system generating a sound of flowing water.
Abstract:
Dispositif et procédé de brouillage confiné disposé dans une zone de couverture dans laquelle peuvent se trouver des dispositifs de radiocommunication interdits dont on cherche à empêcher le fonctionnement, caractérisé en ce qu'il comporte au moins les éléments suivants : • au moins un élément linéique (1) comprenant plusieurs orifices Oi permettant le rayonnement de signaux de brouillage, l'aérien linéique étant relié à un ou plusieurs effecteurs via un connecteur (3), · le ou lesdits éléments effecteurs (2) générant, étant adaptés à injecter à une extrémité au moins de l'aérien linéique (1) un ou plusieurs signaux de brouillage, le flux de puissance Ρ j,f du signal de brouillage J j,f dans la bande B j,f d'une porteuse f est choisi tel que le rapport P Sj,f /P J,f , entre le flux de puissance P Sj,f du signal S j,f potentiellement utilisable par le dispositif interdit sur la porteuse f et le flux de puissance P J,f, du signal J f présent sur la porteuse f pour empêcher le dispositif interdit de fonctionner soit inférieur au seuil de fonctionnement Seuil Sj,t du dispositif interdit.
Abstract:
Embodiments of a method and apparatus for assigning electromagnetic-spectrum (ES) jamming assets are generally described herein. In some embodiments, the method includes dividing an electronic warfare (EW) support area into a grid. The method may further include determining a vulnerability area (VA) of the entity based on planned route information of the entity within the EW support area. The VA may include portions of the grid. The method may further include assigning a first jamming asset to the VA based on a coverage capability of the first jamming asset. The coverage capability may include a number of contiguous portions of the grid.
Abstract:
An example of adaptive location perturbation can include selecting, by a processing resource of a mobile device executing instructions stored on a non-transitory medium, between a plurality of localization technologies to perturb a location measurement of the mobile device. The perturbed location measurement of the mobile device can be sent to a location-based service provider.
Abstract:
A method for waveform-enabled jammer excision (WEJE) may include performing a jammer measurement during a look-through window when no signal-of-interest (SOI) is present and obtaining a jammer signal. A SOI-plus-jammer measurement may be performed and a SOI-plus-Jammer signal may be obtained when both the jammer signal and the SOI are present. Optimal weights that maximize a SOI-to-jammer power ratio may be determined. SOI-plus-jammer signals from a number of antenna elements may be optimally weighted and combined to copy the SOI and null the jammer signal based on the determined optimal weights.
Abstract:
A method for communication includes generating one or more data streams for transmission to respective target receivers (28), and one or more jamming streams. At least one parameter, selected from a group of parameters consisting of power ratios for allocation to the jamming streams and Modulation and Coding Schemes (MCSs) for assigning to the data streams, is calculated based on a criterion that is set to reduce a probability of the data streams being decoded by at least one eavesdropping receiver (32). The data streams and the jamming streams are transmitted using an antenna array (34) while applying the at least one parameter.
Abstract:
A communications and data link jamming system employs a fiber-optic RF delay line to provide rapid responses to threat signals. A sample of the RF signal threat environment is stored within the delay line, and a jamming video signal is added to the stored sample by modulation as it is being extracted from the delay line. The extracted signal is re-circulated back into the delay line, thereby effectively stretching the sample for highly efficient jamming. The jamming system is effective in countering burst communications and in defeating multiple simultaneous threat signals.
Abstract:
A system is disclosed where the well-known psycho-acoustic masking effect, i.e. frequency and/or temporal masking is applied to reduce the human perception of a noise signal. An input signal, such as music or another entertainment signal, is adjusted based on the intensity of the auditory noise by applying existing knowledge about the properties of the human auditory perception and is provided to the human user as a masking sound signal, so that the masking sound elevates the human auditory perception threshold for at least some of the noise signal, whereby the user's perception of that part of the noise signal is reduced or eliminated. The masking sound may be combined with active noise control where a sound in anti-phase with the noise signal is provided for further reduction of the human perception of the noise signal.