ADCS1-1024x683

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:

  1. For measurement of attitude errors two types of sensors are used :
    1. Inertial Measurement Unit (IMU) which includes tri axial: magnetometers, gyros & accelerometers
    2. 4π SteradianSun Sensor (FPSS).
  2. Control electronics
  3. 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.

Other SubSystems

EPS >

Battery tied bus being the simplest power system configurations, has been selected for its minimal complexity.

OBC

PISAT is configured to have TT&C links in the standard TT&C S-band. The operating frequencies are selected to avoid interference to and from the assigned and currently used frequencies of satellites as well as the launch vehicle – PSLV.

RF Systems

PISAT is configured to have TT&C links in the standard TT&C S-band. The operating frequencies are selected to avoid interference to and from the assigned and currently used frequencies of satellites as well as the launch vehicle – PSLV.

Payload >

The payload selected for imaging the earth is a COTS “NanoCam C1U” from Gomspace Inc. NanoCam is a flexible and modular system to rapidly implement tailored imaging systems.