PISAT is configured as a three axis stabilized satellite to meet the pointing and stability requirements of the Imaging payload. The PISAT ADCS configuration consists of the following systems:
- For measurement of attitude errors two types of sensors are used :
- Inertial Measurement Unit (IMU) which includes tri axial: magnetometers, gyros & accelerometers
- 4π SteradianSun Sensor (FPSS).
- Control electronics
- Magnetic Torquer Rods (MTR) to impart torque to the satellite in the desired direction
The three axis stabilization in PISAT shall be achieved by active magnetic control system by using Iron core MTRs mounted along all three axis of the satellite. The actuation of all the three MTR are independent & simultaneous, which employs identical control laws.
Attitude Control Functions
- To perform the on board autonomous attitude determination
- To perform attitude control needed for the mission during its operational phase
- To perform on board orbit propagation.
- To ensure safe and orderly sequence of modes of operation
- To ensure Payload is pointing towards Earth.