Patents by Inventor Kar W. Yung
Kar W. Yung 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: 6643268Abstract: A method (100) for identifying re-routing path solutions for signals within a switch network (10). The path solutions are subject to special constraints that provide the most desired solution for a user. The method applies an algorithm that works by transforming a global problem (110) into many individual sub-problems (112). The algorithm then solves the individual sub-problems (112) systematically according to desired constraints until the global solution is met (120). The method finds a unique state for each switch such that the overall requirements of the system are met.Type: GrantFiled: August 23, 1999Date of Patent: November 4, 2003Assignee: Hughes Electronics CorporationInventors: Kar W. Yung, David C. Cheng, Thu-Tam Trinh-Perches, Kenneth N. Gibson
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Patent number: 6606307Abstract: Methods for operating a satellite constellation are disclosed that utilize spatial diversity and directional gain antennas at ground terminal locations to provide multiple data rate services on a single frequency channel. One method comprises receiving a signal at a first and second satellite in the satellite constellation from a first communications device. A communications channel at a first frequency from the first satellite is used to communicate with the first communications device. A signal from a second communications device is received only at the second satellite at the first frequency, and the second satellite is used to communicate with the second communications device at the first frequency without substantially interfering with the communications with the first communications device.Type: GrantFiled: November 2, 1999Date of Patent: August 12, 2003Assignee: Hughes Electronics CorporationInventors: Donald C. D. Chang, Kar W. Yung, David C. Cheng, Urban A. Von Der Embse, John I. Novak, III, Frank A. Taormina, Ming U. Chang
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Publication number: 20030129942Abstract: Methods for increasing the efficiency of satellite constellation operations are disclosed. The steps of the present invention comprise calculating the maximum number of communications signals that each satellite in the satellite constellation can generate, determining an operational constraint on each satellite, the operational constraint limiting the number of communications signals that each satellite can radiate substantially simultaneously, determining an operational space for each satellite wherein the operational space is defined using the operational constraint and the calculated number of signals, and using the operational space for each satellite in the constellation to determine the operational point for the constellation.Type: ApplicationFiled: October 3, 2002Publication date: July 10, 2003Applicant: Hughes Electronics CorporationInventors: Donald C. D. Chang, Kar W. Yung, David C. Cheng, Urban A. Von Der Embse, John I. Novak, Frank A. Taormina, Ming U. Chang
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Patent number: 6563457Abstract: A method and system for determining a position of an object utilizes two-way ranging and polystatic techniques. A first communication transceiver at a first known location provides a bidirectional communication path between the first communication transceiver and the object wherein the first communication transceiver transmits a first ranging signal to the object and the object transmits a second ranging signal to the first communication transceiver in response to the first ranging signal. The first communication transceiver further provides a first unidirectional communication path between the first communication transceiver and the object wherein the first communication transceiver performs one of transmitting a third ranging signal to the object and receiving a fourth ranging signal from the object.Type: GrantFiled: November 14, 2001Date of Patent: May 13, 2003Assignee: Hughes Electronics CorporationInventors: Donald C. D. Chang, Kar W. Yung, John I. Novak, III, Robert R. Holden
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Publication number: 20030034921Abstract: A modular mobile terminal for a satellite system is disclosed in which the satellite system has a ground station and a network such as a telephone network coupled to the ground station. Each of the mobile terminals has a radome layer and a support layer having a plurality of circuit traces formed thereon. An element module is coupled between the support layer and the radome layer. Each element module comprises a housing and a radiating patch having a feed therethrough. A dielectric layer is coupled adjacent to the radiating patch. A ground plane is disposed adjacent to the dielectric layer on the opposite side of the dielectric layer as the radiating patch. A plurality of circuit chips is coupled to the ground plane. The support layer of the array has a plurality of circuit traces formed thereon. A plurality of interconnections between the circuit chips and the plurality of traces connect the traces and the circuit chips.Type: ApplicationFiled: October 17, 2002Publication date: February 20, 2003Applicant: Hughes Electronics CorporationInventors: Donald C.D. Chang, Urban A. Von Der Embse, Kar W. Yung, John I. Novak
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Publication number: 20030022623Abstract: Methods for increasing the efficiency of satellite constellation operations are disclosed. The steps of the present invention comprise calculating the maximum number of communications signals that each satellite in the satellite constellation can generate, determining an operational constraint on each satellite, the operational constraint limiting the number of communications signals that each satellite can radiate substantially simultaneously, determining an operational space for each satellite wherein the operational space is defined using the operational constraint and the calculated number of signals, and using the operational space for each satellite in the constellation to determine the operational point for the constellation.Type: ApplicationFiled: November 2, 1999Publication date: January 30, 2003Inventors: DONALD C. D. CHANG, KAR W. YUNG, DAVID C. CHENG, URBAN A. VON DER EMBSE, JOHN I. NOVAK III, FRANK A. TAORMINA, MING U. CHANG
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Patent number: 6504505Abstract: A phase control block for combining signals from a phased array antenna includes a phase shifter for generating a phase shifted signal; a phase switch connected to the phase shifter having a first state wherein the phase switch connects a first signal to a switched signal output and a second signal to the phase shifter; and a signal summing device connected to the phase shifter for generating an output that is a sum of the switched signal output and the phase shifted signal.Type: GrantFiled: October 30, 2000Date of Patent: January 7, 2003Assignee: Hughes Electronics CorporationInventor: Kar W. Yung
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Publication number: 20030001048Abstract: A satellite communication system has a first deployment of a plurality of satellites deployed in a medium earth orbit and two later deployments of a plurality of satellites deployed in the medium earth orbit. The first deployment is spaced so that the second deployment may be easily deployed and interleaved into the first deployment. A ground terminal is used for communicating with the satellites in the first and second deployments.Type: ApplicationFiled: August 28, 2002Publication date: January 2, 2003Applicant: Hughes Electronics CorporationInventors: Frank Taormina, Donald C.D. Chang, Kar W. Yung, David C. Cheng, William W. Mayfield, John Novak, Arthur W. Wang
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Patent number: 6501941Abstract: Methods for increasing the efficiency of satellite constellation operations are disclosed. The steps of the present invention comprise calculating the maximum number of communications signals that each satellite in the satellite constellation can generate, determining an operational constraint on each satellite, the operational constraint limiting the number of communications signals that each satellite can radiate substantially simultaneously, determining an operational space for each satellite wherein the operational space is defined using the operational constraint and the calculated number of signals, and using the operational space for each satellite in the constellation to determine the operational point for the constellation.Type: GrantFiled: November 2, 1999Date of Patent: December 31, 2002Assignee: Hughes Electronics CorporationInventors: Donald C. D. Chang, Kar W. Yung, David C. Cheng, Urban A. Von Der Embse, John I. Novak, III, Frank A. Taormina, Ming U. Chang
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Patent number: 6496146Abstract: A modular mobile terminal for a satellite system is disclosed in which the satellite system has a ground station and a network such as a telephone network coupled to the ground station. Each of the mobile terminals has a radome layer and a support layer having a plurality of circuit traces formed thereon. An element module is coupled between the support layer and the radome layer. Each element module comprises a housing and a radiating patch having a feed therethrough. A dielectric layer is coupled adjacent to the radiating patch. A ground plane is disposed adjacent to the dielectric layer on the opposite side of the dielectric layer as the radiating patch. A plurality of circuit chips is coupled to the ground plane. The support layer of the array has a plurality of circuit traces formed thereon. A plurality of interconnections between the circuit chips and the plurality of traces connect the traces and the circuit chips.Type: GrantFiled: August 18, 1999Date of Patent: December 17, 2002Assignee: Hughes Electronics CorporationInventors: Donald C. D. Chang, Urban A. von der Embse, Kar W. Yung, John I. Novak, III
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Patent number: 6460808Abstract: A satellite communication system has a first deployment of a plurality of satellites deployed in a medium earth orbit and two later deployments of a plurality of satellites deployed in the medium earth orbit. The first deployment is spaced so that the second deployment may be easily deployed and interleaved into the first deployment. A ground terminal is used for communicating with the satellites in the first and second deployments.Type: GrantFiled: October 23, 2001Date of Patent: October 8, 2002Assignee: Hughes Electronics CorporationInventors: Frank Taormina, Donald C. D. Chang, Kar W. Yung, David C. Cheng, William W. Mayfield, John Novak, III, Arthur W. Wang
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Publication number: 20020126042Abstract: A system and method for tracking a user. The system is adapted for use in a wireless communication system and creates a plurality of beams within a coverage area. A first beam is directed at a user in a first microcell and a number of additional beams illuminate microcells immediately adjacent the first microcell. The system is equipped with a mechanism for detecting movement of the user from the first microcell to one of the immediately adjacent microcells. On the detection of movement of the user, the system redirects the first beam from the first microcell to a second microcell, the second microcell being one of the adjacent microcells. In the illustrative embodiment, the system is implemented in a stratospheric platform based communication system including a hub adapted to communicate with a stratospheric platform. A transceiver and a phased array antenna are disposed on the platform to communicate with the hub and with the user. A second antenna is provided on the platform to communicate with the hub.Type: ApplicationFiled: September 5, 2001Publication date: September 12, 2002Applicant: Hughes Electronics CorporationInventors: Donald C.D. Chang, Ying Feria, Weizheng Wang, Alan Cha, Ming Chang, Frank A. Hagen, Kar W. Yung
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Publication number: 20020106041Abstract: A mobile satellite payload 18 and a method for sampling communication signals 26 are provided. The mobile satellite payload 18 uses a plurality of receive radiating elements 24 within a phase array antenna 22 to convert the communication signals 26 to received signals [S(t)]. A plurality of low noise amplifiers (LNAs) 28 amplify the received signals [S(t)] to then be received by a plurality of analog-to-digital (A/D) converters 29. The A/D converters 29 transform the received signals [S(t)] into digital baseband signals [S″(t)].Type: ApplicationFiled: October 5, 2001Publication date: August 8, 2002Inventors: Donald C. D. Chang, Kar W. Yung, Urban A. Von der Embse
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Patent number: 6388615Abstract: A system and method for tracking a user. The system is adapted for use in a wireless communication system and creates a plurality of beams within a coverage area. A first beam is directed at a user in a first microcell and a number of additional beams illuminate microcells immediately adjacent the first microcell. The system is equipped with a mechanism for detecting movement of the user from the first microcell to one of the immediately adjacent microcells. On the detection of movement of the user, the system redirects the first beam from the first microcell to a second microcell, the second microcell being one of the adjacent microcells. In the illustrative embodiment, the system is implemented in a stratospheric platform based communication system including a hub adapted to communicate with a stratospheric platform. A transceiver and a phased array antenna are disposed on the platform to communicate with the hub and with the user. A second antenna is provided on the platform to communicate with the hub.Type: GrantFiled: June 6, 2000Date of Patent: May 14, 2002Assignee: Hughes Electronics CorporationInventors: Donald C. D. Chang, Ying Feria, Weizheng Wang, Alan Cha, Ming Chang, Frank A. Hagen, Kar W. Yung
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Publication number: 20020053987Abstract: A method and system for determining a position of an object utilizes two-way ranging and polystatic techniques. A first communication transceiver at a first known location provides a bidirectional communication path between the first communication transceiver and the object wherein the first communication transceiver transmits a first ranging signal to the object and the object transmits a second ranging signal to the first communication transceiver in response to the first ranging signal. The first communication transceiver further provides a first unidirectional communication path between the first communication transceiver and the object wherein the first communication transceiver performs one of transmitting a third ranging signal to the object and receiving a fourth ranging signal from the object.Type: ApplicationFiled: November 14, 2001Publication date: May 9, 2002Applicant: Hughes Electronics CorporationInventors: Donald C.D. Chang, Kar W. Yung, John I. Novak, Robert R. Holden
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Publication number: 20020053627Abstract: A satellite communication system has a first deployment of a plurality of satellites deployed in a medium earth orbit and two later deployments of a plurality of satellites deployed in the medium earth orbit. The first deployment is spaced so that the second deployment may be easily deployed and interleaved into the first deployment. A ground terminal is used for communicating with the satellites in the first and second deployments.Type: ApplicationFiled: October 23, 2001Publication date: May 9, 2002Applicant: Hughes Electronics CorporationInventors: Frank Taormina, Donald C.D. Chang, Kar W. Yung, David C. Cheng, William W. Mayfield, John Novak, Arthur W. Wang
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Patent number: 6377208Abstract: A method and system for determining a position of an object utilizes two-way ranging and polystatic techniques. A first communication transceiver at a first known location provides a bidirectional communication path between the first communication transceiver and the object wherein the first communication transceiver transmits a first ranging signal to the object and the object transmits a second ranging signal to the first communication transceiver in response to the first ranging signal. The first communication transceiver further provides a first unidirectional communication path between the first communication transceiver and the object wherein the first communication transceiver performs one of transmitting a third ranging signal to the object and receiving a fourth ranging signal from the object.Type: GrantFiled: February 21, 1997Date of Patent: April 23, 2002Assignee: Hughes Electronics CorporationInventors: Donald C. D. Chang, Kar W. Yung, John I. Novak, III, Robert R. Holden
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Patent number: 6340947Abstract: A method and system for determining the position of an object, such as an aircraft, utilizes two-way ranging with a polystatic satellite configuration and ground radar. A ground transceiver at a first known location provides a bidirectional communication path between the ground transceiver and the object wherein the ground transceiver transmits a first ranging signal to the object and the object transmits a second ranging signal to the ground transceiver in response to the first ranging signal. A first communication transceiver at a second known location provides a first unidirectional communication path between the first communication transceiver and the object wherein the first communication transceiver performs one of transmitting a third ranging signal to the object and receiving a third ranging signal from the object in response to the first ranging signal.Type: GrantFiled: December 22, 2000Date of Patent: January 22, 2002Assignee: Hughes Electronics CorporationInventors: Donald C. D. Chang, Kar W. Yung, John I. Novak, III, William Goliff
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Publication number: 20020003192Abstract: A satellite communication system has a first deployment of a plurality of satellites deployed in a medium earth orbit and two later deployments of a plurality of satellites deployed in the medium earth orbit. The first deployment is spaced so that the second deployment may be easily deployed and interleaved into the first deployment. A ground terminal is used for communicating with the satellites in the first and second deployments.Type: ApplicationFiled: February 13, 2001Publication date: January 10, 2002Applicant: Hughes Electronics CorporationInventors: Frank Taormina, Donald C.D. Chang, Kar W. Yung, David C. Cheng, William W. Mayfield, John Novak, Arthur W. Wang
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Publication number: 20020003490Abstract: A method and system for determining the position of an object, such as an aircraft, utilizes two-way ranging with a polystatic satellite configuration and ground radar. A ground transceiver at a first known location provides a bidirectional communication path between the ground transceiver and the object wherein the ground transceiver transmits a first ranging signal to the object and the object transmits a second ranging signal to the ground transceiver in response to the first ranging signal. A first communication transceiver at a second known location provides a first unidirectional communication path between the first communication transceiver and the object wherein the first communication transceiver performs one of transmitting a third ranging signal to the object and receiving a third ranging signal from the object in response to the first ranging signal.Type: ApplicationFiled: December 22, 2000Publication date: January 10, 2002Applicant: Hughes Electronics CorporationInventors: Donald C.D. Chang, Kar W. Yung, John I. Novak, William Goliff