دانلود کتاب مدل‌سازی، تعیین وضعیت و کنترل فضاپیما با رویکرد مبتنی بر کواترنیون

My interest in spacecraft modeling, attitude determination, and control started at Orbital Science Corporation. At the end of the summer of 2005, I was looking for a job that would best use my background in controls and optimization. There was an open house for job applicants at the company’s Dulles campus. That was the first time I visited Orbital Science Corporation. I was very fortunate to have a chance to talk to Dr. Brian Keller, the deputy director of GNC (guidance, navigation, and controls) at the time. I showed him my publications in controls and explained my work at previous companies, he listened and immediately promised to set up an interview for me. A few weeks later, my future manager at Orbital Science Corporation, Mr. James Bobbett, called me and an interview was scheduled. Both Brian and James knew that I did not have a background in spacecraft and launch vehicles, however, they trusted my background in controls and believed my prior experience to be beneficial in this work. They offered me the job! I joined Orbital Science Corporation in November 2005. My time at Orbital Science Corporation was delightful. I was deeply involved in the control system designs for two spacecraft and one launch vehicle. My first assignment was to review and learn the design of ROCSAT III in preparation for designing the next spacecraft. In a few weeks, I realized that the design could be improved and proposed an alternative method. I was surprised that my manager, Mr. Bobbett, quickly replied to my email with his strong support for my proposal. The proposed changes were implemented and six satellites were launched in April 2006, all achieving their design requirements. During my time at Orbital Science Corporation, several textbooks on spacecraft controls, such as M.J. Sidi’s book “Spacecraft Dynamics and Control: A Practical Engineering Approach”, B. Wie’s book “Space Vehicle Dynamics and Control”, and J.R. Wertz’s book “Spacecraft Attitude Determination and Control”, were great source to me in understanding this topic. Although all these books are excellent, I believed that some materials could be improved, especially, the control system design methods. However, my work assignments at Orbital Science Corporation were very challenging and I did not have time to think about the specifics of these improvements. I left Orbital Science Corporation to join the US NRC in 2008. At NRC, I have had more free time, after eight hours in the office, to think about these problems. I started to publish papers in 2010 on new methods for spacecraft control and algorithms to design spacecraft control systems, trying to address control related problems in different stages of different missions using different sensors and actuators to cover as many design problems as possible. After a few years, my publications covered a few important areas in spacecraft modeling, attitude determination, and control. On May 1, 2015, I received an email from Vijay Primlani from CRC Press, asking if I was interested in publishing a book with this established publisher. My immediate thought was: that is a cool idea. I said “yes, but it might take some time because I want to consider a few more design problems that I have not done yet, besides I had been working and would continue to work only in my spare time for this project.” I did not know that the delay would be a few years but the promise has been the motivation for me to work continuously on this interesting project. When this project approaches the finish line, I would like to thank a few people, who helped me along the way. First, I would like to thank Dr. Keller and Mr. Bobbett at Orbital Science Corporation for giving me the chance to work in this amazing area. Second, I would like to thank Mr. Primlani at CRC Press for his invitation to write a book with my choice of topic and for his patience with my slow progress. I am also indebted to my former colleague, Dr. Z. Zhou at NASA, who co-authored two papers that are included in this book. Last but not least, I am grateful to my manager, Mr. Ronaldo Jenkins at the US NRC for his support and approval of writing this book in my spare time.