Abstract: A footwear seismic communication unit is provided herein. The unit includes footwear attachable to a foot or feet of a user, including at least one sole portion for placing on a ground and at least one seismic transducer device located within said at least one sole. The unit further includes a processing module, a transmitting interface module, and a receiving interface module.

Abstract: A footwear seismic communication unit is provided herein. The unit includes footwear attachable to a foot or feet of a user, including at least one sole portion for placing on a ground and at least one seismic transducer device located within said at least one sole. The unit further includes a processing module, a transmitting interface module, and a receiving interface module.

Abstract: A seismic transducing device is provided herein. The device includes a container defining a chamber filled with a medium having a controllable seismic impedance; and a seismic transducer disposed in the medium and affixed to the container; wherein at least a portion of the container, being a membrane, is controllable in terms of tension level over the membrane; wherein the seismic transducer is configured, in a transmitter configuration, to convert electrical signals exhibiting a specified pattern, into seismic waves associated with the specified pattern, and wherein the seismic transducer is configured, in a receiver configuration, to convert reflected seismic waves into electrical associated with the reflected seismic waves.

Abstract: A system and method for millimeter wave imaging, comprises at least one illumination source (10) of a millimeter wave beam; a diffuser array (12) comprising a plurality of diffuser elements (12) for diffusing the beam from the illumination source (12) across the desired sector; and at least one camera (16) for obtaining an image of one or more illuminated subjects within the desired sector.

Abstract: A method and system for automatic recognition and classification of a vibrating target among members of a plurality of objects having their vibration spectra stored in a database. In deciding as to which member of an alleged couple of vibrating objects the target should be assigned, the method uses an algorithm of signal processing which is based on wavelet packet analysis to predict a-priory a bandwidth in which the differences between the vibration of the spectrum is mostly pronounced, and the resolution within the bandwidth which is adequate to enable the decision.

Abstract: A method and apparatus for tracking a target. A signal from the target is received using a directional antenna and is digitized to provide a time series of samples. The samples are transformed, preferably by a wavelet transform. A signature of the target is identified in some of the transformed samples and a direction to the target is determined from others of the transformed samples. Target identification and target direction determination are iterated, with the identification being based on the most recently determined direction, and with the direction determination being based on the most recent identification, until a termination criterion is satisfied. Using wavelet transforms gives the antenna an effective beamwidth twenty percent narrower than the antenna aperture.

Abstract: A method and apparatus for tracking a target. A signal from the target is received using a directional antenna and is digitized to provide a time series of samples. The samples are transformed, preferably by a wavelet transform. A signature of the target is identified in some of the transformed samples and a direction to the target is determined from others of the transformed samples. Target identification and target direction determination are iterated, with the identification being based on the most recently determined direction, and with the direction determination being based on the most recent identification, until a termination criterion is satisfied. Using wavelet transforms gives the antenna an effective beamwidth twenty percent narrower than the antenna aperture.