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Attitude Determination & Control System

ADCS. Attitude Determination & Control System. Group 930 & 931. ADCS. Requirements. Inertial pointing satellite . Pointing Accuracy ( 10 deg off axis ). Slew (25 deg off axis). Minimize power consumption. ADCS. Control Modes. Detumbling. Fail Safe. Power Save. Camera Control.

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Attitude Determination & Control System

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  1. ADCS Attitude Determination & Control System Group 930 & 931

  2. ADCS Requirements • Inertial pointing satellite. • Pointing Accuracy (10 deg off axis). • Slew (25 deg off axis). • Minimize power consumption

  3. ADCS Control Modes • Detumbling. • Fail Safe. • Power Save. • Camera Control. • (Communication Control).

  4. ADCS Sensors • Magnetometer. • Horizon Sensor. • Rate Gyros. • Sun Sensors.

  5. ADCS Sensor combinations • Magnetometer & Sun Sensors. • Magnetometer, Sun Sensors & Rate Gyros. • Horizon Sensor, Sun Sensors & Rate Gyros. • Horizon Sensor, Magnetometer & Rate Gyros. • Horizon Sensor, Sun Sensors, Magnetometer & Rate Gyros.

  6. ADCS Actuators • 3 x Magentorquers. • 3 x Magnetorquers + 3 x Momentum Wheels. • 2 x Magnetorquers + 1 x Momentum Wheel. • 3 x Magnetorquers + 1 x Momentum Wheel.

  7. Control structure ADCS Control structure

  8. Interface to CDHS ADCS Interface to CDHS • Receive NORAD lines • Receive Time synchronization • Receive Control mode • Receive Solar panel info • Send Housekeeping • Send Alarms

  9. Mass budget ADCS Mass budget • Magnetorquer(x3) 20g • mounting 5g • Momentum wheel 20g • mounting 5g • PCB+components 50g • Total……………………100g

  10. Power budget ADCS Power budget • nominel peak • Magnetourqer 150 mW 150 mW • Momentum wheel 50 mW 200 mW • Actuator 20 mW 20 mW • Sensor interfaces 20 mW 20 mW • Total…………………… 240 mW 390 mW

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