Donald K Chang, 5426972 Granite Ridge Ct, Santa Clarita, CA 91381

6336612, Jan 8, 2002

Feb 13, 2001

09/783862

Frank Taormina - El Segundo CA
Donald C.D. Chang - Thousand Oaks CA
Kar W. Yung - Torrance CA
David C. Cheng - Palos Verdes Estates CA
William W. Mayfield - Torrance CA
John Novak, III - West Hills CA
Arthur W. Wang - Cypress CA

Hughes Electronics Corporation - El Segundo CA

B64G 100

244158R

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.

6891813, May 10, 2005

Dec 12, 2000

09/735861

Ying Feria - Manhattan Beach CA, US
Ming Chang - Rancho Palos Verdes CA, US
Donald Chang - Thousand Oaks CA, US

The DirecTV Group, Inc. - El Segundo CA

H04Q007/20

370329, 3703102, 370316, 370320, 370328

A communications system and method of operating the communications system includes a high altitude communication device that communicates with a plurality of user terminals and a gateway station. The gateway station couples the users to terrestrial networks and other users. The high altitude communication device has a controller that assigns a first code to a beam of a first plurality of users. When one of the first plurality of users moves to interfere with one of the other of the first plurality of users, the beam associated with the user is reassigned another code.

7609198, Oct 27, 2009

May 16, 2008

12/122566

Donald Chin-Dong Chang - Thousand Oaks CA, US

Spatial Digital Systems, Inc. - Chatsworth CA

G01S 13/00

342 59, 342179

A radar imaging system is provided that directly measures the spatial frequency components of a scene via digital-beam-forming techniques applied along the cross-track dimension. Separate transmit and receive antennas provide increased integration time for the receive function, thus improving the signal-to-noise ratio. A segmented receive antenna is employed and processed as a series of interferometers sensitive to spatial frequency components of the scene corresponding to the separation between pairs of antenna elements. Range gating is used in the along-track dimension to divide the return from an illuminated swath into multiple range bins that may be processed independently. The system provides an improved signal-to-noise ratio and lends significant flexibility to the image formation process, improving the quality of the radar imaging. An embodiment having multiple transmit antennas is also provided that enables the generation of three-dimensional stereoscopic radar images.

7786933, Aug 31, 2010

May 5, 2008

12/115232

Donald Chin-Dong Chang - Thousand Oaks CA, US

Spatial Digital Systems, Inc. - Chatsworth CA

G01S 19/24
G01S 19/37
H01Q 3/36

34235712, 342368, 342372

An advanced multiple-beam GPS receiving system is achieved that is capable of simultaneously tracking multiple GPS satellites independently, detecting multiple interference signals individually, and suppressing directional gain in the antenna pattern of each beam in the interference directions. The GPS receiving system can be used for both planar and non-planar receiving arrays, including arrays that are conformally applied to the surface of a platform such as an aircraft. The GPS receiver combines spatial filtering and acquisition code correlation for enhanced rejection of interfering sources. Enhanced gain in the direction of GPS satellites and the ability to shape the beam patterns to suppress gain in the direction of interfering sources make the GPS receiving system largely insensitive to interfering and jamming signals that plague conventional GPS receivers.

7834807, Nov 16, 2010

May 16, 2008

12/122585

Donald Chin-Dong Chang - Thousand Oaks CA, US

Spatial Digital Systems, Inc. - Chatsworth CA

H01Q 1/00
H01Q 3/00

342370, 342359, 342373

A retro-directive antenna for communicating with a geostationary satellite autonomously detects the direction from which a signal is received, and transmits a beam that points back along the same direction. An array feed is used to illuminate a parabolic reflector. Each feed element of the retro-directive antenna is associated with a unique pointing direction of the beam in the far field. As the transmit energy is switched to different feed elements, the far-field beam is scanned, making it possible to track a geostationary satellite in a slightly inclined orbit. This eliminates the need for mechanical tracking and maintains high antenna gain in the direction of the geostationary satellite. The use of a toroidal reflector with multiple linear array feeds spaced in the azimuth direction enables multi-beam operation, allowing multiple geostationary satellites, spaced by up to fifteen beam widths in azimuth, to be tracked simultaneously and independently.

7890052, Feb 15, 2011

Oct 30, 2007

11/928577

Donald C Chang - Thousand Oaks CA, US
Alan Cha - Glendale CA, US
Jacqueline C Chen - La Canada CA, US
Frank A Hagen - Palos Verdes Estates CA, US

The DIRECTV Group, Inc. - El Segundo CA

H04M 1/00
H04B 7/216
H04B 1/38
H04B 7/19
H04B 7/185
H04W 4/00
H01Q 1/28
H01Q 9/00
H01Q 3/00

455 132, 4555621, 455561, 455430, 455431, 455429, 455 133, 343705, 343706, 343751, 343757, 343777, 370320, 370335, 370342

A communication system has a stratospheric platform with a payload controller and a phased array antenna having a plurality of main array elements for generating a plurality of communication beams and a plurality of auxiliary elements for canceling interference between the communication beams. A gateway station communicates with the stratospheric platform. The gateway station scales the plurality of elements to form a reconfigurable plurality of beams. The gateway station communicates an embedded control signal to the stratospheric platform to communicate a scaling of elements to form the communication beams and the auxiliary element output. The auxiliary element output is used to provide interference canceling.

8035562, Oct 11, 2011

Jul 22, 2010

12/841801

Donald Chin-Dong Chang - Thousand Oaks CA, US

Spatial Digital Systems, Inc. - Chatsworth CA

G01S 5/02
G01S 1/06
G01S 19/21

342417, 342432, 342445, 34235759

An advanced multiple-beam GPS receiving system is achieved that is capable of simultaneously tracking multiple GPS satellites independently, detecting multiple interference signals individually, and suppressing directional gain in the antenna pattern of each beam in the interference directions. The GPS receiving system can be used for both planar and non-planar receiving arrays, including arrays that are conformally applied to the surface of a platform such as an aircraft. The GPS receiver combines spatial filtering and acquisition code correlation for enhanced rejection of interfering sources. Enhanced gain in the direction of GPS satellites and the ability to shape the beam patterns to suppress gain in the direction of interfering sources make the GPS receiving system largely insensitive to interfering and jamming signals that plague conventional GPS receivers.

8098612, Jan 17, 2012

May 16, 2008

12/122462

Donald Chin-Dong Chang - Thousand Oaks CA, US

Spatial Digital Systems, Inc. - Chatsworth CA

H04B 7/185

370316, 370532

A satellite broadcasting system is achieved in which remote beam forming processors located among distributed ground stations are used to control downlink beam footprints and pointing directions. Digital beam forming techniques allow a single satellite downlink broadcast antenna array to generate multiple simultaneous downlinks that can be pointed independently and that may contain distinct information content. By allocating some of the uplink back-channel elements as null channels, continuous calibration of the uplink channel can be performed, improving the performance of the downlink broadcast array and the quality of the broadcast for users. By wavefront multiplexing, all of the uplink channel elements propagate through the all of the available propagation channels simultaneously, eliminating the need for complex and costly individual array-element calibration equipment using on-board or ground-based references.