Cute-1.7 + APD Laboratory for Space Systems

Cute-1.7 + APD II Project - Sub Systems > ADCS -

Small Satellite Program (SSP)

Laboratory for Space Systems (LSS), Tokyo Institute of Technology

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What is Attitude Determination & Control System ?

Attitude Determination & Control System has the function of the calculation where the satellite points (attitude estimation) , pointing where the satellite should be point and damping of angular velocity (attitude control), and so on. As attitude determination, using gyro sensor, magnetic sensor and sun sensor PDA calculates the attitude of the satellite. Also at the ground station PC simulator calculates the attitude using sensor data from the satellite and the results are compared. As attitude control, we use magnetic torquers as the control device and make the satellite spun up and damped its angular velocity. We explain about ADCS of Cute-1.7 + APD II as follows.


Gyro Sensor (ADXRS150)


Magnetic Sensor (HMR2300)


Sun Sensor (S6560)


MTQ (Magnetic Torquer)


DAQ (Data AcQuisition)

There is a DAQ system which becomes important in attitude determination and control system. Main CPU of this satellite is PDA, but PDA has only USB interface, so it is not possible to handle AD conversion and DIO port operation and PWM operation etc. Then, we developed DAQ system as the complementary USB1.1 device of PDA. The main processor is formed with H8S/2328F. So this system sends data to PDA which is converted from digital signal(control the direction of magnetic torquer), analog value(electric current sensor and gyro sensor data etc) and PWM signal(control the strength of magnetic torquer) etc.
DAQ System Block Diagram
DAQ System Block Diagram
System around DAQ
System around DAQ

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