NASA Technical Note


Book Description







ACS Without an Attitude


Book Description

This book de-emphasizes the formal mathematical description of spacecraft on-board attitude and orbit applications in favor of a more qualitative, concept-oriented presentation of these topics. The information presented in this book was originally given as a set of lectures in 1999 and 2000 instigated by a NASA Flight Software Branch Chief at Goddard Space Flight Center. The Branch Chief later suggested this book. It provides an approachable insight into the area and is not intended as an essential reference work. ACS Without an Attitude is intended for programmers and testers new to the field who are seeking a commonsense understanding of the subject matter they are coding and testing in the hope that they will reduce their risk of introducing or missing the key software bug that causes an abrupt termination in their spacecraft’s mission. In addition, the book will provide managers and others working with spacecraft with a basic understanding of this subject.




Analysis and Verification of a Spacecraft Wide-angle Attitude-control System


Book Description

"Attitude control to ensure stability of a spacecraft sluing through large angles was experimentally investigated. The investigation examined a control law synthesized from Euler's theorem on rotation, which states that any attitude change of a rigid body may be accomplished by a single rotation about the appropriate axis. A theoretical analysis showed that a system using the control law is globally stable. The investigation was performed using an air-bearing table to simulate the spacecraft, two gimbaled star trackers as position sensors, rate gyroscopes to provide damping information, and reaction wheels as control torquers. Also a digital computer was used as a real-time controller to determine the desired axis of rotation from the star-tracker gimbal outputs and to generate simultaneous commands to all torquers so that the table would rotate about the desired axis."--P. [i].




NASA Scientific and Technical Reports


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Space Station Systems


Book Description