Resumes
Resumes
Xipu Li Phones & Addresses
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4697 Alex Dr, San Jose, CA 95130 (240) 426-7324
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1090 Norfolk Dr, San Jose, CA 95129 (408) 253-2227
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Fairfield, CA
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117 Dispatch Dr, Washington Crossing, PA 18977 (215) 493-4360
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Washington Xing, PA
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24210 Cornerstone Dr, Morrisville, PA 19067
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Yardley, PA
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Horsham, PA
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Langhorne, PA
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Upper Darby, PA
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Buck, PA
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Campbell, CA
Business Records
Name / Title
Company / Classification
Phones & Addresses
Sundial Sports LLC
Design Sports Decices · Manufacture Sports Devices · Business Services at Non-Commercial Site · Nonclassifiable Establishments
Design Sports Decices · Manufacture Sports Devices · Business Services at Non-Commercial Site · Nonclassifiable Establishments
4697 Alex Dr, San Jose, CA 95130
Threepalm Investment LLC
Real Estate Investment
Real Estate Investment
5974 Pala Mesa Dr, San Jose, CA 95123
Publications
Us Patents
Sun Sensor Alignment Compensation System
View pageUS Patent:
6629672, Oct 7, 2003
Filed:
Mar 8, 2002
Appl. No.:
10/092636
Inventors:
Neil Evan Goodzeit - Princeton NJ
Xipu Li - San Jose CA
Xipu Li - San Jose CA
Assignee:
Lockheed Martin Corporation - Bethesda MD
International Classification:
B64G 136
US Classification:
244171, 701 13, 342355
Abstract:
A method for correcting differences in measurements between sensors. Misalignment of a roll error of a sun sensor alignment is estimated with respect to a reference roll value measured by an earth sensor. Sun sensor assembly elevation angle residual is calculated utilizing the estimated sun sensor assembly roll misalignment. A yaw attitude of the spacecraft is updated based upon the calculated sun sensor assembly elevation residual.
Optimal Speed Management For Reaction Wheel Control System And Method
View pageUS Patent:
7198232, Apr 3, 2007
Filed:
Aug 26, 2004
Appl. No.:
10/926092
Inventors:
Santosh Ratan - Highland Park NJ, US
Xipu Li - San Jose CA, US
Xipu Li - San Jose CA, US
Assignee:
Lockheed Martin Corporation - Bethesda MD
International Classification:
B64G 1/28
US Classification:
244165, 701 13
Abstract:
A spacecraft attitude control system and method in which an attitude controller is configured for sensing three-dimensional attitude of the spacecraft, and producing torque signals for stabilizing the spacecraft in a prescribed attitude in space. At least four mutually skew reaction wheels are rotated in response to the torque control signals for storing three-dimensional angular momentum, and speeds of rotation of the wheels are measured. A reaction wheel speed control processor, responsive to reaction wheel torque and speed for producing reaction wheel spin control signals, implements an infinity-norm algorithm for causing the nullspace components of wheel speed to re-distribute a desired three-dimensional stabilizing momentum of the spacecraft in such a manner that the maximum speeds of rotation of all the reaction wheels is minimized. As a result, periods between successive momentum dumping maneuvers are prolonged to the maximum possible.
Real-Time Swimming Monitor
View pageUS Patent:
20100030482, Feb 4, 2010
Filed:
Jun 14, 2009
Appl. No.:
12/484226
Inventors:
Xipu Li - San Jose CA, US
International Classification:
G06F 19/00
G01C 21/00
G04F 10/00
G01P 3/00
G01C 21/00
G04F 10/00
G01P 3/00
US Classification:
702 19, 701213, 702178, 702142, 702150
Abstract:
A wearable device for monitoring and providing real-time feedback about a swimmer's body motion and performance, in particular, body orientation and forward speed, is provided. The device comprises a three-axis accelerometer, optionally a three-axis gyroscope, a memory, and a microcontroller configured to process the sensor input, calculate a swimmer's performance and provide feedback to the swimmer through an output. The output can be an earpiece or a swimming goggle with a digital display.
Gyroless Control System For Zero-Momentum Three-Axis Stabilized Spacecraft
View pageUS Patent:
6600976, Jul 29, 2003
Filed:
Mar 29, 2002
Appl. No.:
10/108626
Inventors:
Neil Evan Goodzeit - Princeton NJ
Xipu Li - San Jose CA
Santosh Ratan - Highland Park NJ
Harald Weigl - Yardley PA
Xipu Li - San Jose CA
Santosh Ratan - Highland Park NJ
Harald Weigl - Yardley PA
Assignee:
Lockheed Martin Corporation - Bethesda MD
International Classification:
B64G 124
US Classification:
701 13, 244164
Abstract:
A method for maintaining three axis control of a geosynchronous spacecraft without body rate measurements using reaction wheel assemblies. Earth sensor assembly angle measurements are utilized for high-bandwidth roll and pitch control. A positive pitch momentum bias is stored in the reaction wheel assemblies. A gyroscopic feedforward torque is applied to rotate reaction wheel assembly momentum in a yaw/roll plane of the spacecraft at orbit rate. A dynamic mode that couples yaw and roll axes and that results from applying the gyroscopic feedforward torque and the high-bandwidth roll control is damped based on earth sensor assembly roll measurements.