Attitude Determination & Control Training
Attitude Determination & Control Training Course Description
This four-day Attitude Determination & Control Training provides a detailed introduction to spacecraft attitude estimation and control. This course emphasizes many practical aspects of attitude control system design but with a solid theoretical foundation. The principles of operation and characteristics of attitude sensors and actuators are discussed. Spacecraft kinematics and dynamics are developed for use in control design and system simulation. Attitude determination methods are discussed in detail, including TRIAD, QUEST, and Kalman filters. Sensor alignment and calibration are also covered, as well as various types of spacecraft pointing controllers, design and analysis methods. Students should have an engineering background including calculus and linear algebra. Sufficient background mathematics and control theory are presented in the course but is kept to the minimum necessary.
Upon completion of this course you will be able to understand hardware specifications, kinematics and dynamics, and pointing error specifications. You will gain a good understanding of attitude determination and attitude sensor calibration. You will also understand environmental effects on spacecraft pointing, and you will know fundamental principles to design and analyze attitude control algorithms.
With onsite Training, courses can be scheduled on a date that is convenient for you, and because they can be scheduled at your location, you don’t incur travel costs and students won’t be away from home. Onsite classes can also be tailored to meet your needs. You might shorten a 5-day class into a 3-day class, or combine portions of several related courses into a single course, or have the instructor vary the emphasis of topics depending on your staff’s and site’s requirements.
Kinematics. Vectors, direction-cosine matrices, Euler angles, quaternions, frame transformations, and rotating frames. Conversion between attitude representations.
Dynamics. Rigid-body rotational dynamics, Euler’s equation. Slosh dynamics. Spinning spacecraft with long wire booms.
Sensors. Sun sensors, Earth Horizon sensors, Magnetometers, Gyros, Allan Variance & Green Charts, Angular Displacement sensors, Star Trackers. Principles of operation and error modeling.
Actuators. Reaction and momentum wheels, dynamic and static imbalance, wheel configurations, magnetic torque rods, reaction control jets. Principles of operation and modeling.
Environmental Disturbance Torques. Aerodynamic, solar pressure, gravity-gradient, magnetic dipole torque, dust impacts, and internal disturbances.
Pointing Error Metrics. Accuracy, Stability (Smear), and Jitter. Definitions and methods of design and analysis for specification and verification of requirements.
Attitude Control. B-dot and H X B rate damping laws. Gravity-gradient, spin stabilization, and momentum bias control. Three-axis zero-momentum control. Controller design and stability. Back-of-the envelope equations for actuator sizing and controller design. Flexible-body modeling, control-structure interaction, structural-mode (flex-mode) filters, and control of flexible structures. Verification and Validation, and Polarity and Phase testing.
Attitude Determination. TRIAD and QUEST algorithms. Introduction to Kalman filtering. Potential problems and reliable solutions in Kalman filtering. Attitude determination using the Kalman filter. Calibration of attitude sensors and gyros.
Coordinate Systems and Time. J2000 and ICRF inertial reference frames. Earth Orientation, WGS-84, geodetic, geographic coordinates. Time systems. Conversion between time scales. Standard epochs. Spacecraft time and timing.
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