Massachusetts Institute of Technology

Jonathan Peter Doane

Bradley Perry

Glenn A Brigham

Kenneth E Kolodziej

Described embodiments provide sidelobe cancellation for Simultaneous Transmit and Receive systems. The sidelobe cancellation system includes an array having a primary aperture and an auxiliary array. The auxiliary array includes a plurality of antenna elements disposed adjacent to at least one side of the primary aperture. Each element of the auxiliary array is coupled to a variable attenuator, a variable phase shifter or a variable true time delay unit. A controller tunes the auxiliary array to cancel sidelobes of the primary aperture by adaptively selecting an attenuation value of the variable attenuator, a phase shift value of the variable phase shifter and a time delay value of the variable true time delay unit for each element of the auxiliary array. The auxiliary array operates as an adaptive finite-impulse response (FIR) filter with each antenna element of the auxiliary array operating as an adaptive tap of the adaptive FIR filter.

Auxiliary antenna array for wideband sidelobe cancellation

A method and apparatus for achieving simultaneous transmit and receive operation with a digital phased array is described. Digital beamforming and cancellation enables adjacent transmitting and receiving sub-arrays to operate simultaneously in the same frequency band.

Simultaneous transmit and receive with digital phased arrays

A method and apparatus for achieving simultaneous transmit and receive operation with digital cancelling based upon probe waveforms is described. Digital cancelling based upon probe waveforms enables adjacent transmitting and receiving channels to transmit and receive correlated signals.

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Arlington, MA, United States of America

Jonathan Peter Doane