Patents by Inventor Daniel D. Thomas
Daniel D. Thomas has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11928231Abstract: An authentication model dynamically adjusts authentication factors required for access to a remote resource based on changes to a risk score for a user, a device, or some combination of these. For example, the authentication model may conditionally specify the number and type of authentication factors required by a user/device pair, and may dynamically alter authentication requirements based on changes to a current risk assessment for the user/device while the remote resource is in use.Type: GrantFiled: March 7, 2023Date of Patent: March 12, 2024Assignee: Sophos LimitedInventors: Joseph H. Levy, Andrew J. Thomas, Daniel Salvatore Schiappa, Kenneth D. Ray
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Patent number: 11592546Abstract: An airborne radar system and signal interpretation approach that detects slow moving ground targets using angle and Doppler of Keystone formatting process, and is referred to as Angle-Doppler Keystone Formatting (ADK). ADK collapses the clutter ridge to a constant Doppler or to a constant angle, thereby transforming a clutter ridge in angle-Doppler space into a horizontal line of constant Doppler or a vertical line of constant angle. Clutter may then be filtered more effectively, such as by using multiple beams as the source of STAP training data or by using multiple Doppler bins.Type: GrantFiled: April 1, 2019Date of Patent: February 28, 2023Assignee: SRC, Inc.Inventors: Harvey K. Schuman, Daniel D. Thomas, Jr., Jason M. Steeger, Lun Z. Chen
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Publication number: 20230059452Abstract: An airborne radar system and signal interpretation approach that detects slow moving ground targets using angle and Doppler of Keystone formatting process, and is referred to as Angle-Doppler Keystone Formatting (ADK). ADK collapses the clutter ridge to a constant Doppler or to a constant angle, thereby transforming a clutter ridge in angle-Doppler space into a horizontal line of constant Doppler or a vertical line of constant angle. Clutter may then be filtered more effectively, such as by using multiple beams as the source of STAP training data or by using multiple Doppler bins.Type: ApplicationFiled: April 1, 2019Publication date: February 23, 2023Applicant: SYRACUSE RESEARCH CORPORATIONInventors: Harvey K. Schuman, Daniel D. Thomas, JR., Jason M. Steeger, Lun Z. Chen
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Patent number: 10459061Abstract: A radar architecture comprising a computing device having a DC subtraction module, programmed to average a first value of a first pixel from a first received SAR image and a second value of a second pixel from a second received SAR image, to produce an averaged value, and to subtract the averaged value from the first value, resulting in a first DC subtracted pixel value, and to subtract the averaged value from the second value, resulting in a second DC subtracted pixel value; a DFT processing module programmed to receive the first DC subtracted pixel value and the second DC subtracted pixel value and to output a first DFT output comprising a plurality Doppler bins; and a detector module programmed to determine if the output of the DFT represents the presence of a target, and to estimate range-rate via a lookup table.Type: GrantFiled: May 7, 2015Date of Patent: October 29, 2019Assignee: SRC, INC.Inventor: Daniel D. Thomas, Jr.
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Patent number: 10422869Abstract: The present invention relates to a method and system for identifying and eliminating second time-around ambiguous targets and, more particularly, to a method and system for identifying and eliminating second time-around ambiguous targets using waveform phase modulation.Type: GrantFiled: April 17, 2017Date of Patent: September 24, 2019Assignee: SRC, Inc.Inventors: Robert E. Hiemenz, Daniel D. Thomas, Jr.
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Patent number: 10209353Abstract: A system and method for phased-array radar that is capable of accurate phase-only steering at any unambiguous angle is provided. In various embodiments, system and method that compensates for the varying effective element spacing of phased array radar, which occurs as a result of transmitting a wideband signal with phase shifters operating at a fixed phase, by interpolating and resampling across all elements, per frequency, to generate a desired effective spacing between the elements.Type: GrantFiled: May 19, 2015Date of Patent: February 19, 2019Assignee: SRC, INC.Inventor: Daniel D. Thomas, Jr.
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Publication number: 20180100920Abstract: A radar architecture comprising a computing device having a DC subtraction module, programmed to average a first value of a first pixel from a first received SAR image and a second value of a second pixel from a second received SAR image, to produce an averaged value, and to subtract the averaged value from the first value, resulting in a first DC subtracted pixel value, and to subtract the averaged value from the second value, resulting in a second DC subtracted pixel value; a DFT processing module programmed to receive the first DC subtracted pixel value and the second DC subtracted pixel value and to output a first DFT output comprising a plurality Doppler bins; and a detector module programmed to determine if the output of the DFT represents the presence of a target, and to estimate range-rate via a lookup table.Type: ApplicationFiled: May 7, 2015Publication date: April 12, 2018Applicant: SRC, INC.Inventor: Daniel D. Thomas, JR.
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Publication number: 20170299709Abstract: The present invention relates to a method and system for identifying and eliminating second time-around ambiguous targets and, more particularly, to a method and system for identifying and eliminating second time-around ambiguous targets using waveform phase modulation.Type: ApplicationFiled: April 17, 2017Publication date: October 19, 2017Inventors: Robert E. Hiemenz, Daniel D. Thomas, JR.
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Patent number: 9625574Abstract: The present invention relates to a method and system for identifying and eliminating second time-around ambiguous targets and, more particularly, to a method and system for identifying and eliminating second time-around ambiguous targets using waveform phase modulation.Type: GrantFiled: February 7, 2014Date of Patent: April 18, 2017Assignee: SRC, INC.Inventors: Robert E. Hiemenz, Daniel D. Thomas, Jr.
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Publication number: 20160341815Abstract: A system and method for phased-array radar that is capable of accurate phase-only steering at any unambiguous angle is provided. In various embodiments, system and method that compensates for the varying effective element spacing of phased array radar, which occurs as a result of transmitting a wideband signal with phase shifters operating at a fixed phase, by interpolating and resampling across all elements, per frequency, to generate a desired effective spacing between the elements.Type: ApplicationFiled: May 19, 2015Publication date: November 24, 2016Applicant: SRC, INC.Inventor: Daniel D. Thomas, JR.
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Patent number: 9285469Abstract: The present invention is directed to a ground moving target (GMTI) radar that can detect targets, including dismounts, with very small minimum detectable velocities by combining signals from antennas on different spatially separated platforms in a main beam clutter-suppressing spatially adaptive process without requiring that the relative positions of the antenna phase centers be accurately tracked. The clutter nulling is in addition to that provided by the Doppler filters. The spatial displacement provides a narrow mainbeam clutter null reducing undesired target suppression. The clutter-suppressing spatially adaptive structure is used in both the sum and delta channels of the monopulse processor so that the beam distortion caused by the spatial nulling is compensated for, and the monopulse look-up process is preserved to maintain angle accuracy. Noncoherent integration is employed to recover signal to noise loss resulting from the uncertain relative locations of the platforms.Type: GrantFiled: October 29, 2014Date of Patent: March 15, 2016Assignee: SRC, Inc.Inventors: Harvey K. Schuman, Daniel D. Thomas, Jr.
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Publication number: 20160061937Abstract: The present invention relates to a method and system for identifying and eliminating second time-around ambiguous targets and, more particularly, to a method and system for identifying and eliminating second time-around ambiguous targets using waveform phase modulation.Type: ApplicationFiled: February 7, 2014Publication date: March 3, 2016Applicant: SRC, Inc.Inventors: Robert E. Hiemenz, Daniel D. Thomas, JR.
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Patent number: 7430258Abstract: The present invention is directed to a multi-channel signal processing system that includes a fast Fourier transform (FFT) module configured to perform an FFT using a first channel time domain sample as the in-phase component of a complex signal input, and by using the second channel time domain sample as a quadrature component of the complex signal input. The FFT module provides a complex signal spectrum. A channel processing module is coupled to the FFT module. The channel processing module is configured to extract a channel sample spectrum as a function of the complex signal spectrum. A channel equalization module is coupled to the channel processing module. The channel equalization module is configured to multiply the channel sample spectrum by a channel reference spectrum to obtain a correlated and equalized channel sample spectrum.Type: GrantFiled: December 29, 2004Date of Patent: September 30, 2008Assignee: Syracuse Research CorporationInventor: Daniel D. Thomas, Jr.
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Patent number: 5499314Abstract: Rotary mechanical splices between axially aligned optic fibers are seated in axial confinement within bays indented into the shock absorbing body of a holding tray. A retention lid, positioned on the tray covers the splice seating bays and guide slots extending therefrom within which the optic fibers are received to provide cushioned confinement for the splices and resist relative bending of the fibers.Type: GrantFiled: November 22, 1994Date of Patent: March 12, 1996Inventors: Sara M. Leite, Daniel D. Thomas, Gair D. Brown, Alan Schwarting
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Patent number: 5422974Abstract: Rotary mechanical splices between axially aligned optic fibers are seated der axial compression within bays recessed into the body of a holding tray on which a retention lid is fastened in a position to which it is guided by fins on its underside received in grooves formed in the tray body. In such position of the lid on the tray, the lid underside surface covers access formations and the bays between the fins having portions covering fiber slots in the tray through which the optic fibers extend in alignment with their splices.Type: GrantFiled: September 23, 1994Date of Patent: June 6, 1995Assignee: The United States of America as represented by the Secretary of the NavyInventors: Gair D. Brown, Alan C. Schwarting, Robert G. Aldous, Daniel D. Thomas, Francis L. Needham, Sara M. Leite
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Patent number: 5115246Abstract: A radar target locating and tracking apparatus utilizing a data processor unit to process a dual-interleaved pulse train radar waveform to provide unambiguous target location. The data processor utilizes coarse range, fine range and Doppler signals which are derived from the transmitted non-ideal waveform to resolve ambiguities in target location.Type: GrantFiled: February 27, 1991Date of Patent: May 19, 1992Assignee: The United States of America as represented by the Secretary of the Air ForceInventors: Daniel D. Thomas, Jr., Hugh W. Hadley, Joseph J. Len