Patents by Inventor Yoo-La Hwang
Yoo-La Hwang 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: 11125886Abstract: The present invention provides a method of performing a position measurement on the basis of a signal from a global navigation satellite system (GNSS). The method includes: receiving initial position information; estimating an initial value of a multipath error through a measurement of the GNSS signal on the basis of the received initial position information; estimating a multipath error from the initial value of the multipath error on the basis of a change in the measurement; removing the estimated multipath error from the measurement of the GNSS signal; and performing the position measurement on the basis of the GNSS measurement from which the multipath error is removed.Type: GrantFiled: December 9, 2019Date of Patent: September 21, 2021Assignees: Electronics and Telecommunications Research Institute, INDUSTRY ACADEMY COOPERATION FOUNDATION OF SEJONG UNIVERSITYInventors: Yoo La Hwang, Jae Young Ahn, Byoung Sun Lee, Ji Hun Cha, Byung Woon Park, Yong Jun Lee, Cheol Soon Lim
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Publication number: 20200271792Abstract: The present invention provides a method of performing a position measurement on the basis of a signal from a global navigation satellite system (GNSS). The method includes: receiving initial position information; estimating an initial value of a multipath error through a measurement of the GNSS signal on the basis of the received initial position information; estimating a multipath error from the initial value of the multipath error on the basis of a change in the measurement; removing the estimated multipath error from the measurement of the GNSS signal; and performing the position measurement on the basis of the GNSS measurement from which the multipath error is removed.Type: ApplicationFiled: December 9, 2019Publication date: August 27, 2020Applicants: Electronics and Telecommunications Research Institute, INDUSTRY ACADEMY COOPERATION FOUNDATION OF SEJONG UNIVERSITYInventors: Yoo La HWANG, Jae Young AHN, Byoung Sun LEE, Ji Hun CHA, Byung Woon PARK, Yong Jun LEE, Cheol Soon LIM
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Publication number: 20200143700Abstract: Disclosed is a UAV quality certification system. The UAV quality certification system according to an embodiment of the present disclosure may include: a virtual UAV configuring unit determining information on hardware devices included in a UAV, and configuring a virtual UAV; a UAV simulator performing simulation for the virtual UAV; a UAV flight learning unit controlling learning for a UAV flight learning model that receives the information on hardware devices included in the UAV as an input, and outputs a result of the simulation; and a quality evaluation unit performing quality evaluation on at least one target included in the UAV by using the UAV flight learning model.Type: ApplicationFiled: November 5, 2019Publication date: May 7, 2020Applicant: Electronics and Telecommunications Research InstituteInventors: Yoo La HWANG, Byoung Sun LEE, Soo Jeon LEE
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Patent number: 9664794Abstract: Provided is an apparatus for monitoring a malfunctioning state of a global positioning system (GPS) satellite, the apparatus comprising: an orbit computing unit to compute an orbit of a geostationary satellite; a data receiver to receive GPS data from the GPS satellite; a data correction unit to correct an error in a clock error value of the GPS data; a first computing unit to compute a data pseudorange between the GPS satellite and a base station based on the corrected GPS data; a second computing unit to compute a geographical distance between the GPS satellite and the base station; and a determining unit to determine a malfunctioning state of the GPS satellite by comparing the data pseudorange and the geographical distance.Type: GrantFiled: July 30, 2012Date of Patent: May 30, 2017Assignee: Electronics and Telecommunications Research InstituteInventors: Yoo La Hwang, Byoung Sun Lee
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Patent number: 9481476Abstract: Disclosed are a space object disposal device and a space object disposal method using a rotation motion. The device for disposing a space object includes: a disposal orbit calculation unit configured to calculate a disposal orbit of a space object; an escape velocity calculation unit configured to calculate an escape velocity at which the space object moves along the disposal orbit; and a rotation driving unit configured to be connected the space object, rotate the space object on a predetermined rotation orbit so as to reach the escape velocity, and separate the space object at a point of contact of the predetermined rotation orbit and the disposal orbit when the space object rotates at the escape velocity.Type: GrantFiled: February 9, 2015Date of Patent: November 1, 2016Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Yoo La Hwang, Byoung Sun Lee
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Patent number: 9399527Abstract: An apparatus and method for controlling a geostationary orbit satellite is provided. The method including generating remote measurement data by measuring a state of a geostationary orbit satellite, transmitting the remote measurement data, receiving a remote command signal, and controlling an orbit and a pose of the geostationary orbit satellite relative to inclined geosynchronous space debris.Type: GrantFiled: June 7, 2013Date of Patent: July 26, 2016Assignee: Electronics and Telecommunications Research InstitInventors: Byoung Sun Lee, Yoo La Hwang
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Publication number: 20150251777Abstract: Disclosed are a space object disposal device and a space object disposal method using a rotation motion. The device for disposing a space object includes: a disposal orbit calculation unit configured to calculate a disposal orbit of a space object; an escape velocity calculation unit configured to calculate an escape velocity at which the space object moves along the disposal orbit; and a rotation driving unit configured to be connected the space object, rotate the space object on a predetermined rotation orbit so as to reach the escape velocity, and separate the space object at a point of contact of the predetermined rotation orbit and the disposal orbit when the space object rotates at the escape velocity.Type: ApplicationFiled: February 9, 2015Publication date: September 10, 2015Inventors: Yoo La HWANG, Byoung Sun LEE
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Patent number: 8972184Abstract: An apparatus and method for determining an orbit of a geostationary satellite is provided. The orbit of the geostationary satellite may be determined using at least one pseudo-range of the geostationary satellite calculated based on an orbit and a position of at least one global positioning system (GPS) satellite, position information of the geostationary satellite, and an angle between the geostationary satellite and each GPS satellite.Type: GrantFiled: March 14, 2013Date of Patent: March 3, 2015Assignee: Electronics and Telecommunications Research InstituteInventors: Yoo La Hwang, Byoung Sun Lee
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Patent number: 8954270Abstract: Provided is a system for detecting an accident location, including: a navigation apparatus to extract identification information of a preinstalled apparatus, first distance information between the apparatus and at least one base station, and second distance information between the apparatus and a geostationary satellite, when an impact is applied to the apparatus; and an apparatus control center to compute location information of the navigation apparatus based on the identification information, the first distance information, and the second distance information, wherein the at least one base station receives the first distance information from the navigation apparatus and transmits the first distance information to the apparatus control center, and the geostationary satellite receives the second distance information from the navigation apparatus and transmits the second distance information to the apparatus control center.Type: GrantFiled: November 26, 2012Date of Patent: February 10, 2015Assignee: Electronics and Telecommunications Research InstituteInventors: Yoo La Hwang, Byoung Sun Lee, Jae Hoon Kim, Do Seob Ahn
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Publication number: 20140055299Abstract: An apparatus and method for determining an orbit of a geostationary satellite is provided. The orbit of the geostationary satellite may be determined using at least one pseudo-range of the geostationary satellite calculated based on an orbit and a position of at least one global positioning system (GPS) satellite, position information of the geostationary satellite, and an angle between the geostationary satellite and each GPS satellite.Type: ApplicationFiled: March 14, 2013Publication date: February 27, 2014Applicant: Electronics and Telecommunications Research InstituteInventors: Yoo La HWANG, Byoung Sun LEE
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Publication number: 20130327893Abstract: An apparatus and method for controlling a geostationary orbit satellite is provided. The method including generating remote measurement data by measuring a state of a geostationary orbit satellite, transmitting the remote measurement data, receiving a remote command signal, and controlling an orbit and a pose of the geostationary orbit satellite relative to inclined geosynchronous space debris.Type: ApplicationFiled: June 7, 2013Publication date: December 12, 2013Inventors: Byoung Sun LEE, Yoo La HWANG
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Patent number: 8600676Abstract: A flight dynamics subsystem (FDS), a velocity increment calculation module, and operational methods of the same are provided. A used fuel quantity actually used in a satellite is calculated, and a velocity increment is calculated using the calculated fuel quantity. Therefore, an orbit of the satellite may be estimated more accurately.Type: GrantFiled: December 22, 2011Date of Patent: December 3, 2013Assignee: Electronics and Telcommunications Research InstituteInventors: Yoo La Hwang, Byoung Sun Lee, Soo Jeon Lee, Jae Hoon Kim
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Publication number: 20130088387Abstract: Provided is an apparatus for monitoring a malfunctioning state of a global positioning system (GPS) satellite, the apparatus comprising: an orbit computing unit to compute an orbit of a geostationary satellite; a data receiver to receive GPS data from the GPS satellite; a data correction unit to correct an error in a clock error value of the GPS data; a first computing unit to compute a data pseudorange between the GPS satellite and a base station based on the corrected GPS data; a second computing unit to compute a geographical distance between the GPS satellite and the base station; and a determining unit to determine a malfunctioning state of the GPS satellite by comparing the data pseudorange and the geographical distance.Type: ApplicationFiled: July 30, 2012Publication date: April 11, 2013Applicant: Electronics and Telecommunications Research InstituteInventors: Yoo La HWANG, Byoung Sun LEE
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Publication number: 20130019148Abstract: Provided are an apparatus and a method that differently sets the access authority of a user for individual parts of an online document. For every parts of the online document, the user authority is set and the parts are edited only by a user that can access the part. Finally, the parts of the documents are combined as the final document. According to the present invention, the document is divided into parts and the access authority of the user is variously set, which results in maximizing the efficiency of editing the document. The editors of the individual parts inherit the authorities to other people, so that it is very efficient for the cooperative job of a document in the organization having a hierarchy.Type: ApplicationFiled: April 5, 2012Publication date: January 17, 2013Applicants: Korea Aerospace Research Institute, Electronics and Telecommunications Research InstituteInventors: Soo Jeon LEE, Byoung Sun LEE, In Jun KIM, Won Chan JUNG, Yoo La HWANG, Jae Hoon KIM
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Publication number: 20120168566Abstract: A global earth navigation satellite system may be provided. The global earth navigation satellite system may include a group of satellites including at least one inclined geosynchronous satellite disposed in at least one orbital plane distinguished based on an interval determined based on a longitudinal coordinate of the earth, and the at least one inclined geosynchronous satellite may be disposed in the at least one orbital plane at predetermined intervals, and may revolve around the earth at a predetermined inclination of satellite orbit so as to provide, over time, geometric shape change information associated with the earth, geometric shape change information associated with a low earth orbit satellite, and geometric shape change information associated with a geostationary satellite.Type: ApplicationFiled: August 7, 2011Publication date: July 5, 2012Applicant: Electronics and Telecommunications Research InstituteInventors: Byoung Sun LEE, Yoo La HWANG, Jae Hoon KIM
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Publication number: 20120166084Abstract: A flight dynamics subsystem (FDS), a velocity increment calculation module, and operational methods of the same are provided. A used fuel quantity actually used in a satellite is calculated, and a velocity increment is calculated using the calculated fuel quantity. Therefore, an orbit of the satellite may be estimated more accurately.Type: ApplicationFiled: December 22, 2011Publication date: June 28, 2012Applicant: ELECTRONICS AND TELECOMMUNICATONS RESEARCH INSTITUTEInventors: Yoo La HWANG, Byoung Sun Lee, Soo Jeon Lee, Jae Hoon Kim
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Publication number: 20110143778Abstract: Provided are a system and method for estimating position of lost mobile terminal and a mobile terminal. The system for estimating position of lost mobile terminal includes a plurality of base stations and a computing apparatus. Each of the base stations transmits an activation signal, receives a terminal ID from the mobile terminal in response to the activation signal, and transmits a reception time of the terminal ID and the terminal ID. The computing apparatus estimates a position of the mobile terminal corresponding to the terminal ID on the basis of the reception time and a position of each of the base stations.Type: ApplicationFiled: December 29, 2009Publication date: June 16, 2011Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Yoo La HWANG, Jeom Hun LEE, Byoung Sun LEE, Sang Uk LEE
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Patent number: 7840351Abstract: Provided is a method of correcting an ionosphere error, a system of a precise orbit determination using the same and a method thereof. The method includes the steps of: a) determining a time of a highest elevation angle of a GPS satellite per one pass of each GPS satellite received at a LEO satellite or a receiver on a ground; b) determining a minimum total electron content found from an ionosphere model of the determined time per one pass of each GPS satellite; c) determining a total electron content directly calculated from the LEO satellite or a single frequency GPS data; d) determining an ionosphere error value of a single frequency GPS data by combining the minimum total electron content and the directly calculated total electron content; and e) correcting pseudorange data or carrier phase data based on the determined ionosphere error value.Type: GrantFiled: November 4, 2005Date of Patent: November 23, 2010Assignee: Electronics and Telecommunications Research InstituteInventors: Yoo-La Hwang, Byoung-Sun Lee, Jae-Hoon Kim
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Publication number: 20090091493Abstract: Provided is a method of correcting an ionosphere error, a system of a precise orbit determination using the same and a method thereof. The method includes the steps of: a) determining a time of a highest elevation angle of a GPS satellite per one pass of each GPS satellite received at a LEO satellite or a receiver on a ground; b) determining a minimum total electron content found from an ionosphere model of the determined time per one pass of each GPS satellite; c) determining a total electron content directly calculated from the LEO satellite or a single frequency GPS data; d) determining an ionosphere error value of a single frequency GPS data by combining the minimum total electron content and the directly calculated total electron content; and e) correcting pseudorange data or carrier phase data based on the determined ionosphere error value.Type: ApplicationFiled: November 4, 2005Publication date: April 9, 2009Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITInventors: Yoo-La Hwang, Byoung-Sun Lee, Jae-Hoon Kim