Patents by Inventor John M. Elwell
John M. Elwell 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: 8563910Abstract: A projectile's payload is oriented (independently or by orientation of the projectile itself) toward a target just prior to firing (e.g., detonation of the payload), e.g., for munitions providing an increased kill and casualty area and a fire “in defilade” (left, right, backwards or at any angle) capability.Type: GrantFiled: June 3, 2010Date of Patent: October 22, 2013Assignee: The Charles Stark Draper Laboratory, Inc.Inventor: John M. Elwell, Jr.
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Patent number: 8466835Abstract: A non-GPS satellite-based system enables correction of a local clock in a user device to facilitate GPS-based location determination.Type: GrantFiled: May 13, 2011Date of Patent: June 18, 2013Assignee: The Charles Stark Draper Laboratory, Inc.Inventors: John M. Elwell, Jr., Robert D. Tingley
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Publication number: 20120286995Abstract: A non-GPS satellite-based system enables correction of a local clock in a user device to facilitate GPS-based location determination.Type: ApplicationFiled: May 13, 2011Publication date: November 15, 2012Applicant: The Charles Stark Draper Laboratory, Inc.Inventors: John M. Elwell, JR., Robert D. Tingley
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Publication number: 20120256038Abstract: A projectile's payload is oriented (independently or by orientation of the projectile itself) toward a target just prior to firing (e.g., detonation of the payload), e.g., for munitions providing an increased kill and casualty area and a fire “in defilade” (left, right, backwards or at any angle) capability.Type: ApplicationFiled: June 3, 2010Publication date: October 11, 2012Applicant: The Charles Stark Draper Laboratory, Inc.Inventor: John M. Elwell, JR.
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Patent number: 8279119Abstract: Systems and methods for mapping a structure detect wireless signals, including at least one multipath signal that has experienced at least one reflection against a portion of the structure prior to the detection. The wireless signals are analyzed to estimate reflection points for the multipath signal(s), and a map of at least the portion of the structure is generated based on the estimated reflection points.Type: GrantFiled: September 17, 2008Date of Patent: October 2, 2012Assignee: The Charles Stark Draper Laboratory, Inc.Inventors: John M. Elwell, Jr., Donald E. Gustafson, J. Arnold Soltz
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Patent number: 7973716Abstract: Systems and methods for mapping a structure detect wireless signals, including at least one multipath signal that has experienced at least one reflection against a portion of the structure prior to the detection. The wireless signals are analyzed to estimate reflection points for the multipath signal(s), and a map of at least the portion of the structure is generated based on the estimated reflection points.Type: GrantFiled: September 17, 2008Date of Patent: July 5, 2011Assignee: The Charles Stark Draper Laboratory, Inc.Inventors: John M. Elwell, Jr., Donald E. Gustafson
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Patent number: 7679561Abstract: A signal processing technique for RF active, passive, or aided localization approaches that utilizes multipath signals as additional measurements with a filter or estimator, e.g., a nonlinear filter. The filter uses indirect and direct path measurements or any other available signals to build parametric models of observable indirect paths. If one or more direct path measurements are subsequently lost (e.g., due to obstruction), the filter maintains an estimate of the position of the person or object of interest using indirect path measurements.Type: GrantFiled: January 19, 2006Date of Patent: March 16, 2010Assignee: The Charles Stark Draper Laboratory, Inc.Inventors: John M. Elwell, Jr., Donald E. Gustafson, John R. Dowdle
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Publication number: 20090102707Abstract: Systems and methods for mapping a structure detect wireless signals, including at least one multipath signal that has experienced at least one reflection against a portion of the structure prior to the detection. The wireless signals are analyzed to estimate reflection points for the multipath signal(s), and a map of at least the portion of the structure is generated based on the estimated reflection points.Type: ApplicationFiled: September 17, 2008Publication date: April 23, 2009Inventors: John M. Elwell, JR., Donald E. Gustafson
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Publication number: 20090102711Abstract: Systems and methods for mapping a structure detect wireless signals, including at least one multipath signal that has experienced at least one reflection against a portion of the structure prior to the detection. The wireless signals are analyzed to estimate reflection points for the multipath signal(s), and a map of at least the portion of the structure is generated based on the estimated reflection points.Type: ApplicationFiled: September 17, 2008Publication date: April 23, 2009Inventors: John M. Elwell, JR., Donald E. Gustafson, J. Arnold Soltz
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Publication number: 20080198072Abstract: A signal processing technique for RF active, passive, or aided localization approaches that utilizes multipath signals as additional measurements with a filter or estimator, e.g., a nonlinear filter. The filter uses indirect and direct path measurements or any other available signals to build parametric models of observable indirect paths. If one or more direct path measurements are subsequently lost (e.g., due to obstruction), the filter maintains an estimate of the position of the person or object of interest using indirect path measurements.Type: ApplicationFiled: January 19, 2006Publication date: August 21, 2008Inventors: John M. Elwell, Donald E. Gustafson, John R. Dowdle
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Patent number: 6731237Abstract: A system and method for generating a multidimensional navigation solution utilizes Global Positioning System (GPS) data to obtain highly reliable and accurate navigational solutions in high interference and dynamic environments, at a performance level which has been heretofore unattainable. Additional sensors such as inertial (gyros and accelerometers), altimeters, radars, etc. may be employed in a deeply integrated configuration. The approach taken in the present invention differs from that of previous techniques through its exploitation of nonlinear filtering methods; as a result, the navigation system architecture and processes employed yield significant improvements in navigation system performance, both in code tracking and reacquisition, and in carrier tracking and reacquisition. The improvements are particularly significant at low signal/noise ratios, where conventional approaches are especially susceptible to loss of code lock or carrier lock.Type: GrantFiled: December 3, 2001Date of Patent: May 4, 2004Assignee: The Charles Stark Draper Laboratory, Inc.Inventors: Donald E. Gustafson, John R. Dowdle, John M. Elwell, Jr.
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Patent number: 6693592Abstract: A wireless navigational system and process utilize multipath wireless signals normally discarded from the navigation solution to enhance navigational performance under a range of operational scenarios. A relationship between the receiver's location and one or more multipath signals is established, facilitating subsequent navigation using the multipath signal(s).Type: GrantFiled: December 21, 2001Date of Patent: February 17, 2004Assignee: The Charles Stark Draper Laboratory, Inc.Inventors: John R. Dowdle, Donald E. Gustafson, John M. Elwell, Jr.
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Patent number: 6630904Abstract: A system and method for generating a multidimensional navigation solution utilizes Global Positioning System (GPS) data to obtain highly reliable and accurate navigational solutions in high interference and dynamic environments, at a performance level which has been heretofore unattainable. Additional sensors such as inertial (gyros and accelerometers), altimeters, radars, etc. may be employed in a deeply integrated configuration. The approach taken in the present invention differs from that of previous techniques through its exploitation of nonlinear filtering methods; as a result, the navigation system architecture and processes employed yield significant improvements in navigation system performance, both in code tracking and reacquisition, and in carrier tracking and reacquisition. The improvements are particularly significant at low signal/noise ratios, where conventional approaches are especially susceptible to loss of code.Type: GrantFiled: October 10, 2001Date of Patent: October 7, 2003Assignee: The Charles Stark Draper Laboratory, Inc.Inventors: Donald E. Gustafson, John R. Dowdle, John M. Elwell, Jr.
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Publication number: 20020126044Abstract: A system and method for generating a multidimensional navigation solution utilizes Global Positioning System (GPS) data to obtain highly reliable and accurate navigational solutions in high interference and dynamic environments, at a performance level which has been heretofore unattainable. Additional sensors such as inertial (gyros and accelerometers), altimeters, radars, etc. may be employed in a deeply integrated configuration. The approach taken in the present invention differs from that of previous techniques through its exploitation of nonlinear filtering methods; as a result, the navigation system architecture and processes employed yield significant improvements in navigation system performance, both in code tracking and reacquisition, and in carrier tracking and reacquisition. The improvements are particularly significant at low signal/noise ratios, where conventional approaches are especially susceptible to loss of code lock or carrier lock.Type: ApplicationFiled: December 3, 2001Publication date: September 12, 2002Inventors: Donald E. Gustafson, John R. Dowdle, John M. Elwell
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Publication number: 20020089450Abstract: A wireless navigational system and process utilize multipath wireless signals normally discarded from the navigation solution to enhance navigational performance under a range of operational scenarios. A relationship between the receiver's location and one or more multipath signals is established, facilitating subsequent navigation using the multipath signal(s).Type: ApplicationFiled: December 21, 2001Publication date: July 11, 2002Inventors: John R. Dowdle, Donald E. Gustafson, John M. Elwell
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Publication number: 20020047799Abstract: A system and method for generating a multidimensional navigation solution utilizes Global Positioning System (GPS) data to obtain highly reliable and accurate navigational solutions in high interference and dynamic environments, at a performance level which has been heretofore unattainable. Additional sensors such as inertial (gyros and accelerometers), altimeters, radars, etc. may be employed in a deeply integrated configuration. The approach taken in the present invention differs from that of previous techniques through its exploitation of nonlinear filtering methods; as a result, the navigation system architecture and processes employed yield significant improvements in navigation system performance, both in code tracking and reacquisition, and in carrier tracking and reacquisition.Type: ApplicationFiled: October 10, 2001Publication date: April 25, 2002Inventors: Donald E. Gustafson, John R. Dowdle, John M. Elwell
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Patent number: 6331835Abstract: A system and method for generating a multidimensional navigation solution utilizes Global Positioning System (GPS) data to obtain highly reliable and accurate navigational solutions in high interference and dynamic environments, at a performance level which has been heretofore unattainable. Additional sensors such as inertial (gyros and accelerometers), altimeters, radars, etc. may be employed in a deeply integrated configuration. The approach taken in the present invention differs from that of previous techniques through its exploitation of nonlinear filtering methods; as a result, the navigation system architecture and processes employed yield significant improvements in navigation system performance, both in code tracking and reacquisition, and in carrier tracking and reacquisition. The improvements are particularly significant at low signal/noise ratios, where conventional approaches are especially susceptible to loss of code lock or carrier lock.Type: GrantFiled: November 9, 1999Date of Patent: December 18, 2001Assignee: The Charles Stark Draper Laboratory, Inc.Inventors: Donald E. Gustafson, John R. Dowdle, John M. Elwell, Jr.
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Patent number: 4270044Abstract: An inertially aided optical sensing system including an optical sensor, for example a telescope, and an optical reference gyro (ORG). The ORG emits a beam of collimated light aligned with the gyro's angular momentum vector. This light beam is directed into the optical sensor, e.g. a telescope, to create a bright spot, or "star", on the focal plane of the sensor. A closed loop control system adaptively controls the ORG, sensor or both in response to signals representative of the position of the beam incidence point in the focal plane in order to offset dynamic misalignments between an inertial reference system and the optical axis of the sensor arising from bending and internal frame deformations within the optical system.Type: GrantFiled: April 25, 1979Date of Patent: May 26, 1981Assignee: The Charles Stark Draper Laboratory, Inc.Inventor: John M. Elwell, Jr.