United States of America As Represented by the Secretary of the Air Force

Paul Antonik

Michael C Wicks

John Matyjas

A method for transmitting a message, including an array of signal radiating elements for broadcasting signals that are unique one from another. One each of the unique signals is associated with one each of the radiating elements. One each of a set of transmitters is in electronic communication with one each of the radiating elements, and provides the associated unique signal to each of the radiating elements. A signal generating device receives the message from a message source and transforms the message into the unique signals. The unique signals, when broadcast, spatially interfere one with another such that the message is intelligibly receivable at only one location that is predetermined by the signal generating device, and is garbled at all other locations.

Space-time coding with signal separation

A system for transmitting a message, including an array of signal radiating elements for broadcasting signals that are unique one from another. One each of the unique signals is associated with one each of the radiating elements. One each of a set of transmitters is in electronic communication with one each of the radiating elements, and provides the associated unique signal to each of the radiating elements. A signal generating device receives the message from a message source and transforms the message into the unique signals. The unique signals, when broadcast, spatially interfere one with another such that the message is intelligibly receivable at only one location that is predetermined by the signal generating device, and is garbled at all other locations.

Space-time coding with separation

Method and apparatus for simultaneous synthetic aperture radar and moving target detection. A plurality of independent radio frequency signals are generated and applied to separate radiating, receiving antenna elements. Signals are generated as basis functions, such that moving target detection and synthetic aperture radar signals are constructed from individual waveform components in space, time, frequency, and coding. Waveform components are sorted and combined at reception. Received data is simultaneously processed to extract synthetic aperture radar images and moving target indication detections.

Method and apparatus for simultaneous synthetic aperture radar and moving target indication

Method and apparatus for simultaneous synthetic aperture radar and moving target detection. A plurality of independent radio frequency signals are generated and applied to separate radiating/receiving antenna elements. Signals are generated as basis functions, such that moving target detection and synthetic aperture radar signals are constructed from individual waveform components in space, time, frequency, and coding. Waveform components are sorted and combined at reception. Received data is simultaneously processed to extract synthetic aperture radar images and moving target indication detections.

Method and apparatus for a frequency diverse array. Radio frequency signals are generated by a plurality of independent waveform generators and simultaneously applied to a transmit/receive module. A progressive frequency shift is applied to all radio frequency signals across all spatial channels. Amplitude weighting signals are applied for sidelobe control. Phase control is included for channel compensation and to provide nominal beam steering. The progressive frequency offsets generate a new term which cause the antenna beam to focus in different directions as a function of range.

Method and apparatus for a frequency diverse array

Method and apparatus for a frequency diverse array. Radio frequency signals are generated and applied to a power divider network. A progressive frequency shift is applied to all radio frequency signals across all spatial channels. Amplitude weighting signals are applied for sidelobe control. Phase control is included for channel compensation and to provide nominal beam steering. The progressive frequency offsets generate a new term which cause the antenna beam to focus in different directions as a function of range. Alternative embodiments generate different waveforms to be applied to each radiating element, permitting the transmission of multiple signals at the same time.

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Utica, NY, United States of America

Paul Antonik