Patents by Inventor R. James Duckworth
R. James Duckworth 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: 10061012Abstract: A ranging and tracking system and method employs a Coherent Array Reconciliation Tomography (CART) approach that benefits from a series of samples gathered from deployed receivers in an area of interest, and applies a sequence of matrix operations and transformations to data defining locations in a Cartesian grid space for summing constructive characteristics in a received waveform for identifying a leading edge indicative of a time of arrival (TOA) from a signal source, and computing a metric based on the distance to the signal source. Sampled waveform information (data) from multiple locations in the area of interest allows computation of a likelihood metric for each location in the grid space of containing the signal source. Rendering of the grid space location having the highest likelihood metric illustrates a position of the signal source, and may be graphically depicted clustering of the locations depicting a high likelihood.Type: GrantFiled: May 1, 2015Date of Patent: August 28, 2018Assignee: Worcester Polytechnic InstituteInventors: Antti E. Koski, David Cyganski, R. James Duckworth
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Patent number: 9846042Abstract: An indoor localization system uses Visual Simultaneous Localization and Mapping (VSLAM) aided by gyroscope sensor information. Indoor environments pose several challenges which could cause a vision only system to fail due to tracking errors. Investigation revealed significant feature loss in a vision only system when traversing plain walls, windows and staircases. However, the addition of a gyroscope helps in handling such difficult conditions by providing additional rotational information. A portable system consisting of an Inertial Measurement Unit (IMU) and a stereo camera has been developed for indoor mapping. The images and gyroscope rates acquired by the system are stored and post-processed using Gyroscope Assisted Scalable Visual Simultaneous Localization and Mapping Algorithm.Type: GrantFiled: November 13, 2015Date of Patent: December 19, 2017Assignee: Worcester Polytechnic InstituteInventors: Benzun Wisely Babu, David Cyganski, R. James Duckworth
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Patent number: 9658309Abstract: Systems and methods for locating an object are disclosed herein. The locator system includes a plurality of reference units and a processor in communication with the reference units. The reference units are positioned about a region in which a mobile unit is located, and each reference unit includes a transceiver for transmitting and receiving a transaction-based location signal to and from the mobile unit. The processor is configured for estimating time offsets between the mobile unit and reference units and aligning the transaction-based location signals from the reference units by removing the time offsets. The processor is further configured for collectively processing data representative of the aligned location signals based on a plurality of potential locations to identify at least one of the potential locations as a likely mobile unit location.Type: GrantFiled: January 19, 2011Date of Patent: May 23, 2017Inventors: Vincent Thomas Amendolare, R. James Duckworth, David Cyganski
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Publication number: 20170038455Abstract: A ranging and tracking system and method employs a Coherent Array Reconciliation Tomography (CART) approach that benefits from a series of samples gathered from deployed receivers in an area of interest, and applies a sequence of matrix operations and transformations to data defining locations in a Cartesian grid space for summing constructive characteristics in a received waveform for identifying a leading edge indicative of a time of arrival (TOA) from a signal source, and computing a metric based on the distance to the signal source. Sampled waveform information (data) from multiple locations in the area of interest allows computation of a likelihood metric for each location in the grid space of containing the signal source. Rendering of the grid space location having the highest likelihood metric illustrates a position of the signal source, and may be graphically depicted clustering of the locations depicting a high likelihood.Type: ApplicationFiled: May 1, 2015Publication date: February 9, 2017Inventors: Antti E. Koski, David Cyganski, R. James Duckworth
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Patent number: 9476963Abstract: A method for locating a transmitter using a receiver which include, but are not limited to the steps of transmitting a plurality of distinctive and orthogonally polarized signals from a transmitter; receiving the transmitted signals at a pair of separated antennas; demodulating the distinctive orthogonal signals received at each of the pair of separated antennas; and determining a direction to the transmitter from the signals received at the pair of antennas.Type: GrantFiled: April 25, 2011Date of Patent: October 25, 2016Inventors: David Cyganski, R. James Duckworth
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Publication number: 20160209217Abstract: An indoor localization system uses Visual Simultaneous Localization and Mapping (VSLAM) aided by gyroscope sensor information. Indoor environments pose several challenges which could cause a vision only system to fail due to tracking errors. Investigation revealed significant feature loss in a vision only system when traversing plain walls, windows and staircases. However, the addition of a gyroscope helps in handling such difficult conditions by providing additional rotational information. A portable system consisting of an Inertial Measurement Unit (IMU) and a stereo camera has been developed for indoor mapping. The images and gyroscope rates acquired by the system are stored and post-processed using Gyroscope Assisted Scalable Visual Simultaneous Localization and Mapping Algorithm.Type: ApplicationFiled: November 13, 2015Publication date: July 21, 2016Inventors: Benzun Wisely Babu, David Cyganski, R. James Duckworth
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Patent number: 9274208Abstract: Methods and systems that use the time-wise stability of RF location systems and the short time accuracy and spatial stability of inertial tracking system to increase the accuracy of tracking method.Type: GrantFiled: June 28, 2012Date of Patent: March 1, 2016Assignee: Worcester Polytechnic InstituteInventors: David Cyganski, R. James Duckworth
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Patent number: 8928459Abstract: Systems and methods are described herein for determining the location of a transmitter by jointly and collectively processing the full sampled signal data from a plurality of receivers to form a single solution.Type: GrantFiled: June 13, 2008Date of Patent: January 6, 2015Assignee: Worcester Polytechnic InstituteInventors: David Cyganski, R. James Duckworth, John A. Orr, William R. Michalson
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Publication number: 20130099975Abstract: A method for locating a transmitter using a receiver which include, but are not limited to the steps of transmitting a plurality of distinctive and orthogonally polarized signals from a transmitter; receiving the transmitted signals at a pair of separated antennas; demodulating the distinctive orthogonal signals received at each of the pair of separated antennas; and determining a direction to the transmitter from the signals received at the pair of antennas.Type: ApplicationFiled: April 25, 2011Publication date: April 25, 2013Applicant: WORCESTER POLYTECHNIC INSTITUTEInventors: David Cyganski, R. James Duckworth
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Publication number: 20130038488Abstract: Methods and systems that use the time-wise stability of RF location systems and the short time accuracy and spatial stability of inertial tracking system to increase the accuracy of tracking method.Type: ApplicationFiled: June 28, 2012Publication date: February 14, 2013Applicant: Worcester Polytechnic InstituteInventors: David Cyganski, R. James Duckworth
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Publication number: 20120293372Abstract: Systems and methods for locating an object are disclosed herein. The locator system includes a plurality of reference units and a processor in communication with the reference units. The reference units are positioned about a region in which a mobile unit is located, and each reference unit includes a transceiver for transmitting and receiving a transaction-based location signal to and from the mobile unit. The processor is configured for estimating time offsets between the mobile unit and reference units and aligning the transaction-based location signals from the reference units by removing the time offsets. The processor is further configured for collectively processing data representative of the aligned location signals based on a plurality of potential locations to identify at least one of the potential locations as a likely mobile unit location.Type: ApplicationFiled: January 19, 2011Publication date: November 22, 2012Applicant: WORCESTER POLYTECHNIC INSTITUTEInventors: Vincent Thomas Amendolare, R. James Duckworth, David Cyganski
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Publication number: 20100277339Abstract: Systems and methods are described herein for determining the location of a transmitter by jointly and collectively processing the full sampled signal data from a plurality of receivers to form a single solution.Type: ApplicationFiled: June 13, 2008Publication date: November 4, 2010Applicant: Worcester Polytechnic InstituteInventors: David Cyganski, R. James Duckworth, John A. Orr, William R. Michalson
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Patent number: 7292189Abstract: The invention relates to a method of signal analysis that determines the location of a transmitter and to devices that implement the method. The method includes receiving by at least three receivers, from a transmitter, a first continuous-time signal having a first channel. The first channel includes a first plurality of signal carriers having known relative initial phases and having known frequencies which are periodically spaced and which are orthogonal to one another within a first frequency range. The signal analysis method also includes determining the phase shifts of the carriers of the first channel resulting from the distance the carriers traveled in reaching the first receiver. Analysis of the phase shifts yields time difference of arrival information amongst the receivers, which is further processed to determine the location of the transmitter.Type: GrantFiled: September 8, 2005Date of Patent: November 6, 2007Assignee: Worcester Polytechnic InstituteInventors: John A. Orr, William R. Michalson, David Cyganski, R. James Duckworth