Sumários

Attitude Determination and Control Systems (III)

20 Novembro 2025, 11:30 • André Maria da Silva Dias Moitinho de Almeida

  • Disturbing torques
    • External: gravitational gradients, solar pressure, magnetic, dragging etc.
    • Internal: misalignments, movements of appendages, movements of liquids, etc.
    • Secular
  • Sensors and actuators
    • Types of sensors (Earth, Sun, stellar, inertial, magnetic, GPS)
    • Types of passive actuators (rotation, gravity, magnetic, shock absorbers)
    • Types of active actuators (reaction wheels, gyros, propellers, magnetic torque rods)

ESA Project (I)

18 Novembro 2025, 09:00 • André Maria da Silva Dias Moitinho de Almeida

  • Explanation of the ESA project sessions organisation
  • Introduction to ESA OSIP platform and to space projects.
  • Introduction to the GSTP program
  • Formation of groups 
  • Definition of Action Items on groups for next class.

Attitude Determination and Control Systems (II)

18 Novembro 2025, 08:00 • André Maria da Silva Dias Moitinho de Almeida

  • Determination of attitude
    • Sensors (introduction)
    • Estimation and calculations
    • Representation of attitude: Euler angles, cosine directors, quaternions
  • Control strategies
    • Gravity gradient stabilization
    • Mono-axial, dual-spin
    • Tri-axial rotation
  • Disturbing torques
    • External: gravitational gradients, solar pressure, magnetic, dragging etc.
    • Internal: misalignments, movements of appendages, movements of liquids, etc.
    • Secular

Attitude Determination and Control Systems (I)

13 Novembro 2025, 11:30 • André Maria da Silva Dias Moitinho de Almeida

  • Introduction to Attitude Determination and Control System (ADCS)
    • Attitude and reference frames
    • Why determine and control?
    • Requirements and constraints
    • Control loop

Analysis of the orbital object population (part II)

11 Novembro 2025, 09:00 • André Maria da Silva Dias Moitinho de Almeida

  • Analysis of the full population of tracked orbital objects
    • Ingesting a file with TLEs for many objects
    • Orbit integration and exception handling
    • Computation of cartesian positions
    • 3D visualisation of the orbital population
    • Export computations to CSV file for analysis with other software
  • Multi-panel exploration of orbits and other attributes with TOPCAT
    • TOPCAT tutorial 
    • Multi-dimensional analysis of orbital objects using multiple panels with linked views
    • Identification of families of orbital objects