Patents by Inventor Johan Mattsson
Johan Mattsson 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: 11105947Abstract: Inversion of enhanced-sensitivity controlled source electromagnetic data can include combining measured controlled source electromagnetic (CSEM) data onto a common set of virtual receiver positions for each of a plurality of positions of a source along a survey path, determining a steering vector that enhances a sensitivity of the measured CSEM data to a subsurface resistivity variation, and performing an inversion using the measured CSEM data and modeled CSEM data, each having the steering vector applied thereto as a data weight, to better identify the subsurface resistivity variation.Type: GrantFiled: June 7, 2018Date of Patent: August 31, 2021Assignee: PGS Geophysical ASInventors: Lars Erik Magnus Björnemo, Johan Mattsson
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Publication number: 20210169358Abstract: A pressure sensor configured for biological pressure measurement at a distal end portion of an elongated member comprises a dissolvable hydrophilic material coated on a surface of the pressure sensor. A guide wire for biological pressure measurement may include a tube extending along a longitudinal axis of the guide wire; and a pressure sensor for biological pressure measurement, at least a portion of the pressure sensor being mounted within the tube. The pressure sensor comprises a pressure sensor membrane facing a top side of the tube. A circumferential wall of the tube includes at least six openings: a first distal opening, a second distal opening located on a right side of the tube, a third distal opening located on a left side of the tube, a first proximal opening, a second proximal opening located on a right side of the tube, and a third proximal opening located on a left side of the tube.Type: ApplicationFiled: December 17, 2020Publication date: June 10, 2021Applicant: ST. JUDE MEDICAL COORDINATION CENTER BVBAInventors: Shawn BOYE, Fredrik MAHLIN, Stefan TIENSUU, Niklas BORG, Johan MATTSSON, Johan GRUNDIN, Mats HILMERSSON, Sara SUNDLER, Dean HACKER, Ryan CEREPAK
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Patent number: 10898090Abstract: A guide wire for biological pressure measurement includes a tube extending along a longitudinal axis of the guide wire; and a pressure sensor for biological pressure measurement, at least a portion of the pressure sensor being mounted within the tube. The pressure sensor comprises a pressure sensor membrane facing a top side of the tube. A circumferential wall of the tube includes at least six openings: a first distal opening, a second distal opening located on a right side of the tube, a third distal opening located on a left side of the tube, a first proximal opening, a second proximal opening located on a right side of the tube, and a third proximal opening located on a left side of the tube. The first distal opening is larger than the second and third distal openings, and the first proximal opening is larger than the second and third proximal openings.Type: GrantFiled: February 25, 2016Date of Patent: January 26, 2021Assignee: ST. JUDE MEDICAL COORDINATION CENTER BVBAInventors: Shawn Boye, Fredrik Mahlin, Stefan Tiensuu, Niklas Borg, Johan Mattsson, Johan Grundin, Mats Hilmersson, Sara Sundler, Dean Hacker, Ryan Cerepak
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Patent number: 10871590Abstract: Electromagnetic (EM) inversion includes determining an electric field associated with EM data within a predetermined sensitivity area around each of a plurality of source positions, iteratively inverting the electric field for a subsurface resistivity EM model indicative of a subterranean formation for each of a plurality of EM electrical resistivity data cells within each of the predetermined sensitivity areas, and storing results of the iterative inversion. A linear system of equations comprising a Jacobian matrix is generated based on the iterative inversion, the linear system of equations is stored, and the linear system of equations is solved at each iteration of the iterative inversion to update the subsurface resistivity EM model until a convergence criterion is met. A resistivity map based on the updated subsurface resistivity EM model can be produced.Type: GrantFiled: June 15, 2018Date of Patent: December 22, 2020Assignee: PGS Geophysical ASInventors: Johan Mattsson, Carl Joel Gustav Skogman, Leif Abrahamsson, Jenny-Ann Malmberg, Tryggve Sørensen
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Patent number: 10725199Abstract: A method and apparatus for a streamer having a total field magnetometer (“TFM”). A streamer includes a plurality of TFMs in proximity with one another and distributed symmetrically about an axis of the streamer. A streamer includes a first subset of TFMs in a streamer section and in proximity with one another; a second subset in the streamer section and in proximity with one another; wherein the first subset is not in proximity with the second subset. A method includes towing a streamer through a body of water, the streamer comprising first and second TFMs; acquiring magnetic data with the first and the second TFMs; and reducing noise in the data based on at least one of: averaging data from the first and the second TFMs; filtering data from the first and the second TFMs; estimating motion of the first TFM; and estimating rotation of the first TFM.Type: GrantFiled: March 12, 2018Date of Patent: July 28, 2020Assignee: PGS Geophysical ASInventors: Peter Lindqvist, Robert Juhasz, Johan Mattsson
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Patent number: 10705241Abstract: Methods of geophysical prospecting are described herein. In the described methods, a data set of electromagnetic readings from a marine geophysical survey is obtained and loaded into a computer processing system. Using the computer processing system, a high-frequency subset of the data is selected based on a frequency threshold, and a seawater resistivity map is resolved from the subset for a seawater portion of the survey by inversion. The seawater resistivity map can subsequently be used to resolve a resistivity map of the seabed from the data set by inversion.Type: GrantFiled: May 9, 2018Date of Patent: July 7, 2020Assignee: PGS Geophysical ASInventors: Tashi Tshering, Allan McKay, Johan Mattsson, Kathrin Flisnes Bergh
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Patent number: 10694545Abstract: Method for transmitting signals on a transmission channel (103), comprising the steps of detecting (S101) a channel occupancy of a transmission channel (103) by processing data from a receiving path (105) after an activation of a transmission path (111); and deactivating (S102) the transmission path (111) on the basis of the detected channel occupancy.Type: GrantFiled: November 6, 2015Date of Patent: June 23, 2020Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Johan Mattsson, Håkan Andersson, Ashim Biswas
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Patent number: 10613246Abstract: A method and system for estimation of electromagnetic earth responses in a marine electromagnetic survey. A method may comprise estimating initial values of the electromagnetic earth responses and ambient noise applicable to the marine electromagnetic survey; and processing electromagnetic data based on the initial values of the electromagnetic earth responses and the ambient noise to obtain a joint estimation of updated values of the electromagnetic earth responses and the ambient noise, wherein the electromagnetic data was acquired with one or more electromagnetic sensors, wherein the electromagnetic data contains measurements of an electromagnetic field.Type: GrantFiled: August 18, 2015Date of Patent: April 7, 2020Assignee: PGS Geophysical ASInventors: Johan Mattsson, Peter Lindqvist, Erik Björnemo
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Patent number: 10571592Abstract: A resistivity profile can be generated directly from measured electromagnetic field data from a marine survey. A series of transformations can be applied to remove a conductivity dependency from a boundary value problem such that an inversion method may no longer be required to generate the resistivity profile.Type: GrantFiled: June 10, 2016Date of Patent: February 25, 2020Assignee: PGS Geophysical ASInventor: Johan Mattsson
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Publication number: 20180364388Abstract: Inversion of enhanced-sensitivity controlled source electromagnetic data can include combining measured controlled source electromagnetic (CSEM) data onto a common set of virtual receiver positions for each of a plurality of positions of a source along a survey path, determining a steering vector that enhances a sensitivity of the measured CSEM data to a subsurface resistivity variation, and performing an inversion using the measured CSEM data and modeled CSEM data, each having the steering vector applied thereto as a data weight, to better identify the subsurface resistivity variation.Type: ApplicationFiled: June 7, 2018Publication date: December 20, 2018Applicant: PGS Geophysical ASInventors: Lars Erik Magnus Björnemo, Johan Mattsson
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Publication number: 20180364390Abstract: Electromagnetic (EM) inversion includes determining an electric field associated with EM data within a predetermined sensitivity area around each of a plurality of source positions, iteratively inverting the electric field for a subsurface resistivity EM model indicative of a subterranean formation for each of a plurality of EM electrical resistivity data cells within each of the predetermined sensitivity areas, and storing results of the iterative inversion. A linear system of equations comprising a Jacobian matrix is generated based on the iterative inversion, the linear system of equations is stored, and the linear system of equations is solved at each iteration of the iterative inversion to update the subsurface resistivity EM model until a convergence criterion is met. A resistivity map based on the updated subsurface resistivity EM model can be produced.Type: ApplicationFiled: June 15, 2018Publication date: December 20, 2018Applicant: PGS Geophysical ASInventors: Johan Mattsson, Carl Joel Gustav Skogman, Leif Abrahamsson, Jenny-Ann Malmberg, Tryggve Sørensen
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Publication number: 20180329104Abstract: Methods of geophysical prospecting are described herein. In the described methods, a data set of electromagnetic readings from a marine geophysical survey is obtained and loaded into a computer processing system. Using the computer processing system, a high-frequency subset of the data is selected based on a frequency threshold, and a seawater resistivity map is resolved from the subset for a seawater portion of the survey by inversion. The seawater resistivity map can subsequently be used to resolve a resistivity map of the seabed from the data set by inversion.Type: ApplicationFiled: May 9, 2018Publication date: November 15, 2018Inventors: Tashi TSHERING, Allan MCKAY, Johan MATTSSON, Kathrin Flisnes BERGH
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Publication number: 20180329106Abstract: A method and apparatus for a streamer having a total field magnetometer (“TFM”). A streamer includes a plurality of TFMs in proximity with one another and distributed symmetrically about an axis of the streamer. A streamer includes a first subset of TFMs in a streamer section and in proximity with one another; a second subset in the streamer section and in proximity with one another; wherein the first subset is not in proximity with the second subset. A method includes towing a streamer through a body of water, the streamer comprising first and second TFMs; acquiring magnetic data with the first and the second TFMs; and reducing noise in the data based on at least one of: averaging data from the first and the second TFMs; filtering data from the first and the second TFMs; estimating motion of the first TFM; and estimating rotation of the first TFM.Type: ApplicationFiled: March 12, 2018Publication date: November 15, 2018Inventors: Peter LINDQVIST, Robert JUHASZ, Johan MATTSSON
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Publication number: 20180324860Abstract: Method for transmitting signals on a transmission channel (103), comprising the steps of detecting (S101) a channel occupancy of a transmission channel (103) by processing data from a receiving path (105) after an activation of a transmission path (111); and deactivating (S102) the transmission path (111) on the basis of the detected channel occupancy.Type: ApplicationFiled: November 6, 2015Publication date: November 8, 2018Inventors: Johan Mattsson, Håkan Andersson, Ashim Biswas
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Publication number: 20180279340Abstract: A method of scheduling uplink resources, comprising: a radio-access network node transmitting art uplink indication, said uplink indication determining a validity duration of an uplink grant.Type: ApplicationFiled: November 3, 2016Publication date: September 27, 2018Inventors: John Skördeman, Håkan Andersson, Ashim Biswas, Jonas Fröberg Olsson, Johan Mattsson
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Publication number: 20180239049Abstract: Various methods for performing inversion of data obtained from a CSEM survey in order to determine resistivity values in a surveyed space are disclosed. A method includes initializing an objective functional dependent measured and modeled electric field data and iteratively minimizing the objective functional to produce an estimated set of expansion coefficients for generating a multi-dimensional record of resistivity values. The set of expansion coefficients is dependent on a resistivity model, which in turn is used to generate an electric field model in the form of a multi-dimensional grid having a number of grid points. Thus, instead of performing the inversion for each point in the grid, the record of resistivity values is generated based on the set of coefficients. The number of coefficients may be at least one decimal order of magnitude less than the number of grid points, and thus the computational effort is reduced.Type: ApplicationFiled: February 22, 2018Publication date: August 23, 2018Inventor: Johan Mattsson
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Publication number: 20170227668Abstract: A method and system for estimation of electromagnetic earth responses in a marine electromagnetic survey. A method may comprise estimating initial values of the electromagnetic earth responses and ambient noise applicable to the marine electromagnetic survey; and processing electromagnetic data based on the initial values of the electromagnetic earth responses and the ambient noise to obtain a joint estimation of updated values of the electromagnetic earth responses and the ambient noise, wherein the electromagnetic data was acquired with one or more electromagnetic sensors, wherein the electromagnetic data contains measurements of an electromagnetic field.Type: ApplicationFiled: August 18, 2015Publication date: August 10, 2017Applicant: PGS Geophysical ASInventors: Johan Mattsson, Peter Lindqvist, Erik Björnemo
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Publication number: 20170059734Abstract: A resistivity profile can be generated directly from measured electromagnetic field data from a marine survey. A series of transformations can be applied to remove a conductivity dependency from a boundary value problem such that an inversion method may no longer be required to generate the resistivity profile.Type: ApplicationFiled: June 10, 2016Publication date: March 2, 2017Applicant: PGS Geophysical ASInventor: Johan Mattsson
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Publication number: 20160249821Abstract: A guide wire for biological pressure measurement includes a tube extending along a longitudinal axis of the guide wire; and a pressure sensor for biological pressure measurement, at least a portion of the pressure sensor being mounted within the tube. The pressure sensor comprises a pressure sensor membrane facing a top side of the tube. A circumferential wall of the tube includes at least six openings: a first distal opening, a second distal opening located on a right side of the tube, a third distal opening located on a left side of the tube, a first proximal opening, a second proximal opening located on a right side of the tube, and a third proximal opening located on a left side of the tube. The first distal opening is larger than the second and third distal openings, and the first proximal opening is larger than the second and third proximal openings.Type: ApplicationFiled: February 25, 2016Publication date: September 1, 2016Applicant: ST. JUDE MEDICAL COORDINATION CENTER BVBAInventors: Shawn BOYE, Fredrik MAHLIN, Stefan TIENSUU, Niklas BORG, Johan MATTSSON, Johan GRUNDIN, Mats HILMERSSON, Christian SPRINGE, Sara SUNDLER, Dean HACKER, Ryan CEREPAK
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Patent number: 8990019Abstract: Disclosed are apparatus and methods for determining characteristics of a target region which is embedded in background material below a body of water. In accordance with one embodiment, a resistivity background is determined. In addition, characteristics of an electric dipole due to the target region are determined. A resistance for the target region is then computed using the characteristics of the electric dipole and the resistivity background. Other embodiments, aspects and features are also disclosed.Type: GrantFiled: November 30, 2011Date of Patent: March 24, 2015Assignee: PGS Geophysical ASInventor: Johan Mattsson