Company Filing History:
Years Active: 1994-2015
Title: The Innovative Contributions of Dan Y Liu
Introduction
Dan Y Liu is a prominent inventor based in Rancho Palos Verdes, CA. He has made significant contributions to the field of spacecraft control systems, holding a total of 5 patents. His work focuses on enhancing the maneuverability and stability of spacecraft through innovative methods and systems.
Latest Patents
One of Liu's latest patents is titled "Position-based gyroless control of spacecraft attitude." This invention presents a system and method for commanding a spacecraft to perform a three-axis maneuver based solely on position measurements. By utilizing an inertial gimbal concept, Liu derived a set of formulae that map inertial motion to the spacecraft body frame based on position information. This allows the spacecraft to execute desired inertial position maneuver commands effectively. Additionally, the system employs an intrusion steering law to safeguard the spacecraft from acquisition failure during long sensor intrusions.
Another notable patent is "Systems and method of controlling a spacecraft using attitude sensors." This invention provides a solution for damping nutation and eliminating wobble in a spacecraft that is spinning about a given axis. The system includes a sensor that determines three-dimensional attitude measurements of the spacecraft. A processor, connected to the sensor, executes a process to align the spin axis with the spacecraft's momentum vector. The processor receives attitude data, determines a torque command, and controls a momentum storage actuator to reduce angular deviation about the specified axis.
Career Highlights
Dan Y Liu has worked with esteemed companies such as The Boeing Company and Hughes Aircraft Company. His experience in these organizations has contributed to his expertise in spacecraft technology and control systems.
Collaborations
Throughout his career, Liu has collaborated with notable individuals, including Richard Yining Chiang and John F Yocum, Jr. These collaborations have further enriched his work and innovations in the field.
Conclusion
Dan Y Liu's contributions to spacecraft control systems through his innovative patents demonstrate his significant impact on the industry. His work continues to influence advancements in spacecraft maneuverability and stability.