Abstract: A method and system for securing, protecting and controlling defined areas by managing access points for entering and exiting vehicles or mobile entities, and matching entering vehicle or mobile entity identification information with exiting identification information. This may include obtaining and storing a unique onboard signature and/or physical characteristics from entering vehicles or mobile entities for matching with the identity information obtained from exiting vehicles or mobile entities. In addition a paper or electronic Ticket/Tag may be encoded with the entering identification information and issued to an agent of the entering vehicle or mobile entity for later presentation at exiting, whereby a three-way matching of exiting, entering, and Ticket/Tag information must be satisfied for the vehicle or mobile entity to be released from the controlled area.

Abstract: This invention is a thermoacoustic system for communicating between an airborne or spaceborne vehicle and a sound detector that is located aboard an object beneath the surface of the water. The foregoing system comprises a laser or particle accelerator that is located aboard an airborne or spaceborne vehicle. The laser produces a light beam whose amplitude is subsequently modulated or whose pulses are varied in time. A particle accelerator would produce a pulsed particle beam that varies in time. These modulated or varied pulses are focused or deflected to a small layer of water at the air/water interface so that the beam will be absorbed by the water causing the water to produce an acoustic signal that will propagate to the sound detector.