Patents by Inventor William H. Wellman

William H. Wellman 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).

  • Patent number: 9891306
    Abstract: A method for improving geolocation accuracy in a passive radar warning receiver, using synchronized data curve-fit and interpolation to asynchronous and noisy receiver and navigation measurements over observation periods that are extended to reduce inaccuracies caused by noise. The present disclosure yields synchronized data samples at intervals short enough that constant-rate equations are valid, even though the actual motions over the observation interval may be more complex and have higher-order dynamics. It reduces noise, synchronizes data samples, and is readily adapted to motions with variable acceleration. The method generates rate samples short enough to satisfy constant rate assumptions, yet fit data over intervals long enough to enhances measurement accuracy by reducing measurement noise.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: February 13, 2018
    Assignee: Raytheon Company
    Inventors: William H. Wellman, Lee M. Savage, John T. Broad
  • Patent number: 9739878
    Abstract: Methods and apparatus for determining an angle of arrival in a radar warning system that uses tracking to provide a more accurate angle of arrival than conventional systems. In exemplary embodiments, angle of arrival and range are mapped from measured body angles to a 3D coordinate system where modern tracking techniques are applied to improve accuracy and stabilization of measurements, then mapped back into body angles for display.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: August 22, 2017
    Assignee: RAYTHEON COMPANY
    Inventors: Eric J. Gudim, William H. Wellman
  • Patent number: 9606848
    Abstract: Several types of noise limit the performance of remote sensing systems, e.g., systems that determine the location, color, or shape of remote objects. When noise detected by sensors of the remote sensing systems is known and well estimated, a Kalman filter can converge on an accurate value without noise. However, non-Gaussian noise bursts can cause the Kalman filter to diverge from an accurate value. Current approaches arbitrarily boost noise with fixed additive or multiplicative factors, which slows filter response and often fails to give timely results. Such noise boosts prevent divergence due to badly corrupted measurements. Disclosed embodiments eliminate a subset of noise measurements having the largest errors from a data set of noise measurements and process the remaining data through the Kalman filter. Advantageously, disclosed embodiments enable a Kalman filter to converge on an accurate value without the introduction of noise boost estimates.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: March 28, 2017
    Assignee: Raytheon Company
    Inventors: William H. Wellman, Eric J. Gudim, Lee M. Savage
  • Publication number: 20170003376
    Abstract: A method for improving geolocation accuracy in a passive radar warning receiver, using synchronized data curve-fit and interpolation to asynchronous and noisy receiver and navigation measurements over observation periods that are extended to reduce inaccuracies caused by noise. The present disclosure yields synchronized data samples at intervals short enough that constant-rate equations are valid, even though the actual motions over the observation interval may be more complex and have higher-order dynamics. It reduces noise, synchronizes data samples, and is readily adapted to motions with variable acceleration. The method generates rate samples short enough to satisfy constant rate assumptions, yet fit data over intervals long enough to enhances measurement accuracy by reducing measurement noise.
    Type: Application
    Filed: July 2, 2015
    Publication date: January 5, 2017
    Applicant: RAYTHEON COMPANY
    Inventors: William H. Wellman, Lee M. Savage, John T. Broad
  • Publication number: 20160363660
    Abstract: Methods and apparatus for determining an angle of arrival in a radar warning system that uses tracking to provide a more accurate angle of arrival than conventional systems. In exemplary embodiments, angle of arrival and range are mapped from measured body angles to a 3D coordinate system where modern tracking techniques are applied to improve accuracy and stabilization of measurements, then mapped back into body angles for display.
    Type: Application
    Filed: March 25, 2014
    Publication date: December 15, 2016
    Applicant: RAYTHEON COMPANY
    Inventors: Eric J. Gudim, William H. Wellman
  • Patent number: 9223007
    Abstract: Accurate remote tracking of fixed objects from a moving platform requires overcoming platform noise. Such tracking becomes difficult when the only inertial reference (such as a central aircraft inertial navigation system) is remote from the sensor, which experiences non-measured angular movements due to airframe vibrations and flexing. In such a scenario, Kalman filtering cannot converge on a true value because all noise sources are not known. Current naïve approaches arbitrarily boost noise with fixed additive or multiplicative factors. However, such approaches slow filter response and; thus, often fail to give timely results. Embodiments of the present disclosure derive inertial reference parameters to quantify noise of the sensor that is remote from the inertial reference. Advantageously, disclosed embodiments enable use of remote sensors with an existing inertial reference, rather than consolidating sensors and the inertial reference at a single location or providing inertial references at each sensor.
    Type: Grant
    Filed: November 21, 2012
    Date of Patent: December 29, 2015
    Assignee: Raytheon Company
    Inventors: William H. Wellman, Eric J. Gudim, Lee M. Savage
  • Publication number: 20140281779
    Abstract: Several types of noise limit the performance of remote sensing systems, e.g., systems that determine the location, color, or shape of remote objects. When noise detected by sensors of the remote sensing systems is known and well estimated, a Kalman filter can converge on an accurate value without noise. However, non-Gaussian noise bursts can cause the Kalman filter to diverge from an accurate value. Current approaches arbitrarily boost noise with fixed additive or multiplicative factors. Such approaches slow filter response and; thus, often fail to give timely results. Such noise boosts prevent divergence due to badly corrupted measurements. Disclosed embodiments eliminate a subset of noise measurements having the largest errors from a data set of noise measurements and process the remaining data through the Kalman filter. Advantageously, disclosed embodiments enable a Kalman filter to converge on an accurate value without the introduction of noise boost estimates, which adds processing time.
    Type: Application
    Filed: March 12, 2013
    Publication date: September 18, 2014
    Applicant: RAYTHEON COMPANY
    Inventors: William H. Wellman, Eric J. Gudim, Lee M. Savage
  • Publication number: 20140139374
    Abstract: Accurate remote tracking of fixed objects from a moving platform requires overcoming platform noise. Such tracking becomes difficult when the only inertial reference (such as a central aircraft inertial navigation system) is remote from the sensor, which experiences non-measured angular movements due to airframe vibrations and flexing. In such a scenario, Kalman filtering cannot converge on a true value because all noise sources are not known. Current naïve approaches arbitrarily boost noise with fixed additive or multiplicative factors. However, such approaches slow filter response and; thus, often fail to give timely results. Embodiments of the present disclosure derive inertial reference parameters to quantify noise of the sensor that is remote from the inertial reference. Advantageously, disclosed embodiments enable use of remote sensors with an existing inertial reference, rather than consolidating sensors and the inertial reference at a single location or providing inertial references at each sensor.
    Type: Application
    Filed: November 21, 2012
    Publication date: May 22, 2014
    Applicant: RAYTHEON COMPANY
    Inventors: William H. Wellman, Eric J. Gudim, Lee M. Savage
  • Patent number: 8422005
    Abstract: Various embodiments provide an optical alignment apparatus that includes a mirror structure having a plurality of mirrors, the mirror structure being configured for mounting a lens. The plurality of mirrors are arranged so as to redirect a collimated beam of radiation into the lens at different angles so as to measure one or more alignment parameter of the lens.
    Type: Grant
    Filed: July 14, 2010
    Date of Patent: April 16, 2013
    Assignee: Raytheon Company
    Inventors: Joseph F. Borchard, William H. Wellman
  • Patent number: 8254018
    Abstract: A monolithic body (31) has a compound optical surface that defines a centrally located lens element (31B) that is transmissive to light having wavelengths of interest, such as infrared radiation (IR), and a reflector (31B) disposed about the lens element that is reflective to the light. The monolithic body is comprised of a material selected for fabricating a refractive lens element. The compound optical surface has a centrally located portion defining the lens element surrounded by a generally curved surface region having a reflective coating that defines the reflector. The centrally located portion may be coated with an anti-reflection coating. The compound optical surface is preferably formed in one operation, such as one that uses a diamond point turning operation.
    Type: Grant
    Filed: April 25, 2003
    Date of Patent: August 28, 2012
    Assignee: Raytheon Company
    Inventors: William H. Wellman, Joseph F. Borchard, Douglas Anderson
  • Publication number: 20120013895
    Abstract: Various embodiments provide an optical alignment apparatus that includes a mirror structure having a plurality of mirrors, the mirror structure being configured for mounting a lens. The plurality of mirrors are arranged so as to redirect a collimated beam of radiation into the lens at different angles so as to measure one or more alignment parameter of the lens.
    Type: Application
    Filed: July 14, 2010
    Publication date: January 19, 2012
    Applicant: RAYTHEON COMPANY
    Inventors: Joseph F. BORCHARD, William H. WELLMAN
  • Publication number: 20110304515
    Abstract: According to one embodiment, a radiation sensor comprises a first pixel and a second pixel. The first pixel comprises a first plurality of antenna elements, a first photodetector, and one or more first feed lines coupling the first plurality of antenna elements to the first photodetector. The second pixel comprises a second plurality of antenna elements, a second photodetector, and one or more second feed lines coupling the second plurality of antenna elements to the second photodetector. The second pixel is an off-axis pixel. Signals feeding each of the second plurality of antenna elements are varied such that an effective radiation pattern of the second plurality of antenna elements is reinforced in a desired direction and suppressed in an undesired direction.
    Type: Application
    Filed: June 11, 2010
    Publication date: December 15, 2011
    Applicant: Raytheon Company
    Inventors: William H. Wellman, Michael A. Gritz
  • Patent number: 7807951
    Abstract: An imaging sensor system includes an optics system that images a point feature of a scene at an image plane with a blur-circle image having a blur diameter, and a detector array at the image plane. Special array patterns and signal detector logic are used to improve the accuracy of the determination of the object location. In one form, the detector array is a one-dimensional detector array comprising a plurality of detector subelements each having a width of from about ½ to about 5 blur diameters, and a length of n blur diameters. Each detector subelement overlaps each of two adjacent detector subelements along their lengths. An overlap of each of the two adjacent detector subelements is m blur diameters, and a center-to-center spacing of each of the two adjacent detector subelements is nO blur diameters. The value of n is equal to about 3m, and the value of m is equal to about nO/2. In another form, the detector is a two-dimensional detector array of detector subelements.
    Type: Grant
    Filed: March 1, 2004
    Date of Patent: October 5, 2010
    Assignee: Raytheon Company
    Inventors: Mary Morabito O'Neill, Gregory K. Pierce, William H. Wellman
  • Patent number: 7679057
    Abstract: An infrared sensor element having an antenna coupled directly into a rectifier. Infrared radiation impinging the antenna induces an alternating current. The rectifier converts the alternating current into a rectified signal. The rectified signal corresponds to a magnitude of the incident infrared radiation impinging the antenna, and can be used for detection and imaging operations. Coupling the antenna directly into the rectifier eliminates the need for a photodetector. The wavelength of sensor elements can be separately tuned. A sensor made up of a plurality of such sensor elements can operate in a time-division multiplexed mode sensing different infrared bandwidths in separate time segments. Two or more sensors each made up of a plurality of sensor elements can be co-located in a single focal plane and operated separately to detect infrared radiation in different bandwidths. A sensor element can also operate in bandwidths other than infrared.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: March 16, 2010
    Assignee: Raytheon Company
    Inventors: Michael A. Gritz, William H. Wellman, Rafael Hernandez
  • Patent number: 7624666
    Abstract: An object such as an aircraft in flight is obscured from infrared detection when viewed from an external viewing location. The method includes providing the object having an externally viewable hot region associated therewith, wherein the hot region has a temperature greater than 150° C. A source of an obscuring agent is provided, wherein the obscuring agent comprises a mixture of carbon dioxide gas and water vapor. The obscuring agent is ejected from a dispensing location so as to flow between the hot region and the external viewing location. The obscuring agent has a temperature of less than that of the hot region.
    Type: Grant
    Filed: July 8, 2003
    Date of Patent: December 1, 2009
    Assignee: Raytheon Company
    Inventors: Mary Morabito O'Neill, William H. Wellman
  • Patent number: 7586075
    Abstract: A position of a feature in a scene is located by forming an image of the feature using a segmented array having a plurality of array subelements. Each of the array subelements has an output signal. The output signals from at least two spatially adjacent array subelements are cooperatively analyzed to establish a data set reflective of an extent to which output signals responsive to the image of the feature are produced from exactly one or from more than one of the adjacent array subelements. The data set is used to reach a conclusion as to a location of the image of the feature on the segmented array. Increased positional accuracy is attained with no loss of sensitivity.
    Type: Grant
    Filed: March 1, 2004
    Date of Patent: September 8, 2009
    Assignee: Raytheon Company
    Inventors: Mary Morabito O'Neill, Gregory K. Pierce, William H. Wellman
  • Publication number: 20090108202
    Abstract: An infrared sensor element having an antenna coupled directly into a rectifier. Infrared radiation impinging the antenna induces an alternating current. The rectifier converts the alternating current into a rectified signal. The rectified signal corresponds to a magnitude of the incident infrared radiation impinging the antenna, and can be used for detection and imaging operations. Coupling the antenna directly into the rectifier eliminates the need for a photodetector. The wavelength of sensor elements can be separately tuned. A sensor made up of a plurality of such sensor elements can operate in a time-division multiplexed mode sensing different infrared bandwidths in separate time segments. Two or more sensors each made up of a plurality of sensor elements can be co-located in a single focal plane and operated separately to detect infrared radiation in different bandwidths. A sensor element can also operate in bandwidths other than infrared.
    Type: Application
    Filed: October 30, 2007
    Publication date: April 30, 2009
    Inventors: Michael A. Gritz, William H. Wellman, Rafael Hernandez
  • Patent number: 7002154
    Abstract: A wide-angle IR imaging system (1A) has an entrance aperture (40) for admitting IR from a scene and a dewar (4A) that contains a coldshield (3) that encloses a cooled IR detector (2) disposed at an image plane (2A). The dewar includes a dewar window (4), and an optical axis of the IR imaging system passes through the dewar window and the image plane. The IR imaging system further includes a plurality of uncooled optical elements (22, 24, 26, 28) disposed along the optical axis between the entrance aperture and the dewar window, and a plurality of generally annular reflector segments (18A, 18B) disposed around the optical axis between the dewar window and the entrance aperture. Each of the reflector segments has a reflective surface that faces the dewar window.
    Type: Grant
    Filed: April 25, 2003
    Date of Patent: February 21, 2006
    Assignee: Raytheon Company
    Inventors: William H. Wellman, Joseph F. Borchard, Douglas Anderson
  • Patent number: 7002139
    Abstract: A window mounting system for optical sensors including a removable connection for window replacement, an alignment system to assure precision registration of the window or dome with the sensor internal optics, and thermal insulation to limit heat transfer from the window to the optics housing and sensor. The removable connection maintains precise optical alignment of curved domes with significant optical power, yet also is effective with simple flat windows.
    Type: Grant
    Filed: April 23, 2003
    Date of Patent: February 21, 2006
    Assignee: Raytheon Company
    Inventors: Charles R. Stallard, William H. Wellman
  • Patent number: 6979119
    Abstract: Sensing in an elevated-temperature environment is provided using a sensor system having a sensor housing with an exterior wall with a window-support region having an outwardly facing external face, and a window through the window-support region of the exterior wall and affixed to the exterior wall. A sensor unit contained within the sensor housing receives an input signal through the window. A thermal-insulation layer is on the external face of the window-support region of the exterior wall at a location immediately adjacent to the window. The sensor system is operated in an environment wherein the window-support region of the exterior wall is heated to a temperature of greater than about 100° C. in the event that no thermal-insulation layer is present. In a typical application, the sensor system is attached to an aircraft such that the external face is in a forward-facing orientation, and the aircraft is operated such that the external face is heated by aerodynamic heating.
    Type: Grant
    Filed: April 30, 2003
    Date of Patent: December 27, 2005
    Assignee: Raytheon Company
    Inventors: William H. Wellman, Aldon L. Bregante, Rao S. Ravuri