Abstract: A system and method for detecting weapons. A radiofrequency transmitter transmits an RF signal stream into a region of interest. An RF receiver receives a scattered signal stream from the region of interest. The scattered signal stream is generated in the region of interest from the radiofrequency signal stream when a target is at least partially within the region of interest. A plurality of resonant signal components are identified from the scattered signal stream. Preprocessed resonant signal components are generated by removing environmental signal components. A target assessment is determined from the preprocessed resonant signal components using a trained statistical model. A target response is triggered if the target assessment indicates that a weapon is detected on the target.

Abstract: A system and method for detecting weapons. A radiofrequency transmitter transmits an RF signal stream into a region of interest. An RF receiver receives a scattered signal stream from the region of interest. The scattered signal stream is generated in the region of interest from the radiofrequency signal stream when a target is at least partially within the region of interest. A plurality of resonant signal components are identified from the scattered signal stream. Preprocessed resonant signal components are generated by removing environmental signal components. A target assessment is determined from the preprocessed resonant signal components using a trained statistical model. A target response is triggered if the target assessment indicates that a weapon is detected on the target.

Abstract: A wave-potential detector and a wave-potential radiator are provided that detect and radiate wave-potential signals having longitudinally polarized A vectors, respectively. Wave-potential receivers and transmitters incorporating the wave-potential detector and wave-potential radiator, respectively, are also provided. The wave-potential detector includes a biased plasma device, having at least a portion of its bias current that is parallel to the direction of propagation of a wave-potential signal having a longitudinally polarized A vector. Both omnidirectional and directive wave-potential radiators are provided.

Abstract: A wave-potential detector and a wave-potential radiator are provided that detect and radiate wave-potential signals having longitudinally polarized A vectors, respectively. Wave-potential receivers and transmitters incorporating the wave-potential detector and wave-potential radiator, respectively, are also provided. The wave-potential detector includes a biased plasma device, having at least a portion of its bias current that is parallel to the direction of propagation of a wave-potential signal having a longitudinally polarized A vector. Both omnidirectional and directive wave-potential radiators are provided.