Attitude Determination and Control System (ADCS)

Our ADCS stabilizes the CubeSat with Passive Magnetic Attitude Control (PMAC) using a magnet and hysteresis rods. Stabilizing the antennas will help with radiocommunication as well as stabilizing our payload’s camera(s) will enable them to take better photos.

Photos from: 
•	Passive Magnetic Attitude Control for CubeSat Spacecraft by D Gerhardt
•	ISISPACE iMTQ Magnetorquer Board
•	NanoAvionics CubeSat Reaction Wheels Control System SatBus 4RW

ADCS (Attitude Determination and Control System):

There are three main methods for CubeSats to stabilize: reaction wheels, magnetorquers, and permanent magnets. Reaction wheels would take too much space in our 1U CubeSat, while both reaction wheels and magnetorquers drain the invaluable solar power. That is why we decided to use a permanent magnet.

Photo: PMAC magnet configuration (from “Passive Magnetic Attitude Control for CubeSat Spacecraft” by David T. Gerhardt)

PMAC (Passive Magnetic Attitude Control):

PMAC consists of two main elements: a bar magnet and perpendicular hysteresis rods. The bar magnet stabilizes a CubeSat in two axes by lining itself up with Earth’s magnetic field. However, the CubeSat still spins on the third axis. That is why we use hysteresis rods to slow down the spinning. The time in which a CubeSat can stabilize depends on how strong is it tumbling after being deployed. For example, it could take two days to stabilize on the two axes controlled by the bar magnet, and it could take another eight days for the hysteresis rods to slow down the spinning.

Mr Fahrenheit

Mr Fahrenheit is a CubeSat satellite project entirely managed by high-school students attending IB World School 1531 from Warsaw, Poland.

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