Aocs Intro

Attitude & Orbit Control System (AOCS) Introduction Huaizu You National Space Organization 12 April 2007

References ,[object Object],[object Object],[object Object]

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Attitude/Orbit equations of motion

Orbital dynamics: two-body problem ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Orbital dynamics: three-body problem ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Orbital dynamics: Kepler’s time eq. ,[object Object],[object Object],M: mean anomaly, E: eccentric anomaly e: eccentricity, a: semimajor axis

Orbital dynamics: orbital elements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Orbital dynamics: environmental perturbations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Orbital dynamics: Lagrange planetary equation ,[object Object],[object Object],[object Object]

Orbital Maneuvers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Attitude dynamics: rotational kinematics ,[object Object],[object Object],[object Object],[object Object],[object Object]

Rotational kinematics: direction cosine matrix (orthonormal) ,[object Object]

Rotational kinematics: Euler’s angles ,[object Object],[object Object],[object Object]

Rotational kinematics: Euler’s eigenaxis rotation ,[object Object]

Rotational kinematics: quaternions ,[object Object],[object Object],[object Object]

Rotational kinematics: kinematic differential equations ,[object Object]

[object Object],[object Object],[object Object],[object Object],Attitude dynamics: rigid-body dynamics if at the center of mass if it is a rigid body J : moment of inertia matrix of a rigid body about a body-fixed reference frame with its origin at the center of mass.

Attitude dynamics: general torque-free motion (M=0) ,[object Object],[object Object],[object Object]

Attitude dynamics: constant body-fixed torque (M=const.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Gravitational Orbit-Attitude Coupling ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],Solve Attitude/Orbit dynamics numerically Cowell’s formulation (Encke’s method)

AOCS hardware ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Comparison of attitude sensors courtesy from Oliver L. de Weck: 16.684 Space System Product Development, Spring 2001 Department of Aeronautics & Astronautics, Massachusetts Institute of Technology

AOCS hardware: gyro ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

AOCS hardware: MAG & MTQ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

AOCS hardware: reaction wheel ,[object Object],[object Object],[object Object],[object Object],[object Object]

AOCS hardware: thruster ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Attitude Determination ,[object Object],[object Object],[object Object],[object Object],[object Object]

Orbit Determination ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Attitude control: some definitions

Attitude Control ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Attitude control systems comparisons Control actuator torque values A comparison of various control systems

Attitude control: environmental effects ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Attitude control: spin/dual-spin stabilization

Attitude control: three-axis active control ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Attitude control: gravity gradient stabilization ,[object Object],[object Object],[object Object],[object Object],courtesy from Oliver L. de Weck: 16.684 Space System Product Development, Spring 2001 Department of Aeronautics & Astronautics, Massachusetts Institute of Technology

Attitude control: momentum exchange ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

AOCS Design: spin stabilization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

AOCS Design: dual-spin stabilization ,[object Object],[object Object],[object Object],[object Object],[object Object]

AOCS Design: three-axis active control ,[object Object],[object Object],[object Object],[object Object],[object Object]

FormoSat-2 follow-on animation ,[object Object],[object Object]

Questions ? ,[object Object],[object Object],[object Object],[object Object]

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