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Karla Vega
University of California, Berkeley
Attitude Determination and Control
04/18/23
Outline
Requirements Hardware Attitude Determination Dynamics Attitude Control
Types Disturbances
Integration and Test Summary ACS in CubeSats
CINEMA
*Lecture notes from Dr. Glenn Lightsey’s Spacecraft Dynamics and Controls Graduate Course at University of Texas at Austin 04/18/23TRIO-CINEMA Meeting
Getting Underway
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Requirements and Flowdowns
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Tree Diagram
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Impact of ACS on S/C Configuration
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Some Standard Configurations
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Hardware
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Star Sensors
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Earth Sensors
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Earth Sensors Cont.
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Sun Sensors
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Magnetometers
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GPS
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Typical External Sensor Performance
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Gyros
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Typical Gyro Performance
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Typical Inertial Sensor Performance
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Sensor Selection
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Sensor Selection Continued
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Actuators
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Torque Coils Wheels
Reaction Wheels Momentum Wheels Controlled Moment Gyros
Thrusters
Wheels
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Wheels Continued
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Thrusters
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Thrusters Continued
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Attitude Determination and Control
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Attitude Determination
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Frames of Reference Parameterization Geometry Estimation
Statistics Observability
Attitude Parameterization
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Propagating Attitudes
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Propagating Euler Angles
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Propagating Quaternions
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Geometry of Attitude Determination
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Implementation
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Implementation Continued
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Implementation Continued
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Estimation Theory: combining several measurement
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Dynamics: Euler’s Equations
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Integration
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Attitude Control
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Disturbances
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Some Typical Disturbance Torque Magnitudes
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Gravity Gradient
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Gravity Gradient, circular orbit
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Stability Diagram for GG in circular Orbit
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Effects of Elliptical Orbits
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Design of GG Satellites
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Magnetic Attitude Control
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Magnetic Controls, Continued
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Using Magnets
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Comments of Field Models
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Momentum Bias
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Integration and Test
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I&T Continued
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Summary
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ACS in CubeSats
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Passive Control Magnets aligned with magnetic field
Active Control Torque Coils Solar panels as sun sensors Reaction Wheels ($$) Digital sun sensors ($$)
ACS: CINEMA (more on Wednesday)
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Spin-stabilized satellite Desired Attitude: Ecliptic normal System pointing requirement
Science: ±10° Determination: ±1° Control: ±1°
Hardware V-slit sun sensor Solar panels (3 current sensors) TBR Magnetometer Torque Coil
Some Useful References
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