Attitude Determination & Control System Group 930 & 931.

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Presentation transcript:

Attitude Determination & Control System Group 930 & 931

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

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

Sensors Magnetometer. Horizon Sensor. Rate Gyros. Sun Sensors.

Sensor combinations 1.Magnetometer & Sun Sensors. 2.Magnetometer, Sun Sensors & Rate Gyros. 3.Horizon Sensor, Sun Sensors & Rate Gyros. 4.Horizon Sensor, Magnetometer & Rate Gyros. 5.Horizon Sensor, Sun Sensors, Magnetometer & Rate Gyros.

Actuators 1.3 x Magentorquers. 2.3 x Magnetorquers + 3 x Momentum Wheels. 3.2 x Magnetorquers + 1 x Momentum Wheel. 4.3 x Magnetorquers + 1 x Momentum Wheel.

Control structure

Interface to CDHS 1.Receive NORAD lines 2.Receive Time synchronization 3.Receive Control mode 4.Receive Solar panel info 5.Send Housekeeping 6.Send Alarms Interface to CDHS

Mass budget Magnetorquer(x3)20g mounting5g Momentum wheel20g mounting5g PCB+components50g Total……………………100g Mass budget

Power budget nominelpeak Magnetourqer150 mW150 mW Momentum wheel50 mW200 mW Actuator20 mW20 mW Sensor interfaces20 mW20 mW Total……………………240 mW390 mW Power budget

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