1. The book that turned toward what mattered

Neal Stephenson’s The Diamond Age returns as the recalled work because the Young Lady’s Illustrated Primer must continuously decide what to display and how to respond to its reader’s context. The desktop’s pointing manager must do the same: decide which way the platform should face and how to transition between goals.

This entry asks what autonomous pointing management needs from the desktop.

2. Sensors

The platform needs data to decide. Possible sensors include:

  • Attitude sensors: star tracker, sun sensors, IMU, magnetometer.
  • Position and timing: GNSS receiver.
  • Target tracking: payload sensors that report where the target is relative to the body.
  • Power and thermal telemetry: array current, radiator temperature, heater state.
  • Actuator telemetry: wheel speeds, magnetorquer currents, thruster status.

No single sensor is enough. The attitude sensors say where the platform is pointing; the GNSS says where it is in orbit; the payload sensors say where the target is; the power and thermal telemetry say whether the current pointing is sustainable.

3. Models

Sensors need interpretation. The platform needs models that map data to decisions:

  • Attitude dynamics model: how the platform rotates given actuator commands and disturbances.
  • Actuator model: wheel torque and saturation, magnetorquer capability versus magnetic field, thruster impulse.
  • Orbit and target model: where the Sun, Earth, ground stations, and customer targets are.
  • Power and thermal model: how attitude affects generation and heat rejection.
  • Mission model: which payloads need what pointing, when, and with what accuracy.

These models do not need to be perfect. They need to be accurate enough to avoid keep-out zones and conservative enough to avoid saturation.

4. Actuators

The platform must be able to act on its decisions. Actuators include:

  • Reaction wheels for precision attitude changes.
  • Magnetorquers for momentum dumping and safe-mode control.
  • Thrusters for large slews and emergency control.
  • Gimbals or steerable mechanisms for arrays, antennas, or radiators.
  • Payload pointing mechanisms such as fast steering mirrors.

5. Policy

Autonomy without policy is just spinning. The desktop needs rules such as:

  • Mode priorities: which pointing goal wins when they conflict?
  • Keep-out zones: what attitudes or directions must be avoided?
  • Slew limits: maximum rate, acceleration, and momentum cost per maneuver.
  • Customer windows: minimum guaranteed pointing time and notice for schedule changes.
  • Override: how does ground command a specific attitude or halt autonomous scheduling?
  • Recovery: what attitude does the platform retreat to if a slew fails or a sensor is lost?

6. What this changes

  • Autonomous pointing management is a closed-loop system of sensors, models, actuators, and policy.
  • It draws on the same infrastructure as autonomous power budgeting and radiation mitigation.
  • The next entry will close the autonomous pointing management wondering arc and record the decision.