Dr. Anthony W. Sarto Profile

Dr. Anthony W. Sarto

at L3Harris Technologies Inc

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Author

Publications (8)

Proceedings Article | 24 April 1997 Paper

Laser-communication cooperative research and development agreement between Air Force Phillips Lab and Ball Aerospace

David Begley, Robert Kehr, Anthony Sarto, William Casey, Everett Coffelt, Alan Goodrich, William Thompson

Proceedings Volume 2990, (1997) https://doi.org/10.1117/12.273691

KEYWORDS: Laser communications, Liquid crystals, Satellites, Aerospace engineering, Acquisition tracking and pointing, Digital signal processing, Space telescopes, Satellite communications, Telecommunications, Telescopes

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Proceedings Article | 5 November 1996 Paper

Photorefractive phased array antenna beam-forming processor

Anthony Sarto, Kelvin Wagner, Robert Weverka, Steven Blair, Samuel Weaver

Proceedings Volume 2845, (1996) https://doi.org/10.1117/12.257235

KEYWORDS: Antennas, Signal processing, Phased array optics, Holography, Bragg cells, Crystals, Radar signal processing, Wave propagation, Radio propagation, Optical simulations

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Proceedings Article | 5 November 1996 Paper

Efficient true-time-delay adaptive array processing

Kelvin Wagner, Shawn Kraut, Lloyd Griffiths, Samuel Weaver, Robert Weverka, Anthony Sarto

Proceedings Volume 2845, (1996) https://doi.org/10.1117/12.257233

KEYWORDS: Phased arrays, Antennas, Sensors, Signal detection, Phased array optics, Adaptive optics, Holograms, Acousto-optics, Crystals, Nulling interferometry

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Proceedings Article | 30 June 1995 Paper

Three-dimensional photorefractive signal processing for radar applications

Robert Weverka, Kelvin Wagner, Anthony Sarto

Proceedings Volume 2481, (1995) https://doi.org/10.1117/12.212711

KEYWORDS: Signal processing, Radar, Antennas, Radar signal processing, Crystals, 3D image processing, Bandpass filters, Algorithms, Volume holography, Image processing

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Proceedings Article | 10 June 1994 Paper

Beam-steering and jammer-nulling photorefractive phased-array radar processor

Anthony Sarto, Robert Weverka, Kelvin Wagner

Proceedings Volume 2155, (1994) https://doi.org/10.1117/12.177419

KEYWORDS: Antennas, Signal processing, Radar, Phased array optics, Bragg cells, Adaptive optics, Holography, Crystals, Integrated optics, Volume holography

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We are developing a class of optical phased-array-radar processors which use the large number of degrees-of-freedom available in 3D photorefractive volume holograms to time integrate the adaptive weights to perform beam-steering and jammer-cancellation signal-processing tasks for very large phased-array antennas. We have experimentally demonstrated independently the two primary subsystems of the beam-steering and jammer-nulling phased-array radar processor, the beam-forming subsystem and the jammer-nulling subsystem, as well as simultaneous main beam formation and jammer suppression in the combined processor. The beam-steering subsystem calculates the angle of arrival of a desired signal of interest and steers the antenna pattern in the direction of this desired signal by forming a dynamic holographic grating proportional to the correlation between the incoming signal of interest from the antenna array and the temporal waveform of the desired signal. This grating is formed by repetitively applying the temporal waveform of the desired signal to a single acousto-optic Bragg cell and allowing the diffracted component from the Bragg cell to interfere with an optical mapping of the received phased-array antenna signal at a photorefractive crystal. The diffracted component from this grating is the antenna output modified by an array function pointed towards the desired signal of interest. This beam-steering task is performed with the only a priori information being that of the knowledge of a temporal waveform that correlates well with the desired signal and that the delay of the desired signal remains within the time aperture of the Bragg cell. The jammer-nulling subsystem computes the angles-of- arrival of multiple interfering narrowband radar jammers and adaptively steers nulls in the antenna pattern in order to extinguish the jammers by implementing a modified LMS algorithm in the optical domain. This task is performed in a second photorefractive crystal where holographic gratings are formed which are proportional to the correlation between the unprocessed antenna output and a delayed version of the formed main beam. The diffracted components from these gratings are subtracted from the formed main-beam signal producing a processor output with reduced jammer content.

Proceedings Article | 10 June 1994 Paper

Three-dimensional holographic data processing and wavelength readout for range-doppler-angle radar, and synthetic-aperture radar

Robert Weverka, Kelvin Wagner, Anthony Sarto, Samuel Weaver

Proceedings Volume 2155, (1994) https://doi.org/10.1117/12.177415

KEYWORDS: Radar, Data processing, Holography, Doppler effect, Ranging, Synthetic aperture radar, Volume holography, Charge-coupled devices

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Proceedings Article | 9 November 1993 Paper

Photorefractive phased-array-radar processor dynamics

Anthony Sarto, Robert Weverka, Kelvin Wagner

Proceedings Volume 2026, (1993) https://doi.org/10.1117/12.163620

KEYWORDS: Signal processing, Bragg cells, Signal detection, Crystals, Antennas, Sensors, Fabry–Perot interferometers, Radar, Feedback loops, Diffraction gratings

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Proceedings Article | 2 December 1992 Paper

Optical processing for self-cohering of phased-array imaging signals

Robert Weverka, Kelvin Wagner, Anthony Sarto

Proceedings Volume 1703, (1992) https://doi.org/10.1117/12.138425

KEYWORDS: Radar, Reflectors, Bragg cells, Phased array optics, Antennas, Diffraction, Oscillators, Phase conjugation, Phased arrays, Calibration

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Showing 5 of 8 publications

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