ANUSAT

ANUSAT (Anna University Satellite) is the first University Satellite of India to be launched by Polar Satellite Launch Vehicle (PSLV). The 40 kg micro satellite developed by the Anna University carries a Store and Forward Payload. Apart from this secondary payloads are MEMS Gyro, MEMS Magnetometer and Satellite Positioning System.

ANUSAT is launched into 41^o inclined orbit. Major accomplishments of student community are:

1. Design and build a spacecraft by the university
2. Spacecraft power system of 40W provided by GaAs solar cells with a backup of 10 Ah Li Ion battery
3. Telemetry system in VHF with data for house keeping and auxiliary payloads
4. Telecommand system in VHF to command the spacecraft
5. AOCS system consisting of Sensor systems, magnetometer and Twin slit sensors and actuators consisting of torquers along the three axes.
6. Control spin rate to 8 rpm +/- 0.5 rpm
7. Up link data in VHF band for store and forward payload
8. Store and Forward payload data down link transmission in UHF

Specifications:
1. Application : Digital Communication using Store & Forward Techniques
2. Size : 600 mm x 600 m x 600 mm Cuboid
3. Mass : 40 kg
4. Solar Array : body Mounted Ga As Solar Cells Generating 40 W
5. Battery : Li Ion (4x5) 20 Cells
6. Telecommand : ON/OFF and Data commands VHF PCM/FSK/AM 100 bps 149.2 MHz
7. Telemetry : VHF/PCM/FSK/AM 512 bps 137.4 MHz
8. Store and Forward : VHF 145.8 MHz Uplink, UHF 435 MHz Downlink
9. Attitude control : Spin stabilized with spin axis orientation using magnetic Stabilization torque
10. Spin Rate : 8 +/- 0.5 rpm (Automatic SRC)
11. Spin Axis Orientation : +/- 3^o (SAOC) Sun normal or Orbit normal
12. Sun sensor : +/- 75^o with 0.5 o resolution
13. Magnetometer : +/- 60,000 Gamma with 500 gamma resolution
14. Torquers : 4.5 Am² capacity (2 Nos. Z Axis), 1 each in X Y axis
15. Launch : PSLV-C12