Nonlinear time-reversal in a semi-reverberant complex enclosure

Time reversal (TR) techniques have been shown to be effective in focusing short pulses in rich scattering, multipath environments. In order to apply TR in such environments, the impulse response (IR) between the source antenna(s) and a target location is needed. When the IR is time-reversed and retransmitted into the environment, the waves experience the same multipath while the signal contains a reversed delay profile. This essentially “undoes” the multipath delays, coherently adding the pulses from the multipath components at the target to form a short pulse resembling the original impulse. Such temporal compression and spatial focusing may enable efficient delivery of high power RF pulses to a specific target location within a complex enclosure.