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Pratham IITB Student Satellite Project

Pratham IITB Student Satellite Project. Saptarshi Bandyopadhyay Project Manager and System Engineer Pratham , IIT Bombay 15 th May, 2011. Student satellite – The Idea!. Aim - To develop a satellite in a time frame of 2-3 years be of low cost low mass ( < 10kgs )

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Pratham IITB Student Satellite Project

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  1. PrathamIITB Student Satellite Project SaptarshiBandyopadhyay Project Manager and System Engineer Pratham, IIT Bombay 15th May, 2011

  2. Student satellite – The Idea! • Aim - To develop a satellite in • a time frame of 2-3 years • be of low cost • low mass (< 10kgs) • launch it into orbit • COTS instruments to reduce costs • Success of mission attached to process of learning, not just final output • Satellites are test-beds for new technology that need space qualification MINI – SPUTNIK ASUSAT NCUBE SSETI AAU Cubesat SNOE ICARUS CATSAT DTUSAT MEROPE COMPASS SEEDS

  3. Mission Statement for Pratham • Create a learning experience of working on a real life multi-disciplinary complex system.  Learning enhancement throughCDIO (Conceive, Design, Integrate and Operate). http://www.cdio.org/ • Acquiring knowledge in Satellite and Space Technology. • Have the Satellite entirely designed by the student body of IIT Bombay. • Have the Satellite launched; measure TEC of the Ionosphere above IITB. • Involve students from other universities in our Satellite project.

  4. Information about Pratham • Weight: ~10 kgs • Size: 260mm X 260mm X 260mm • Payload: Measuring TEC • Orbit: 10:30 polarsun-synchronous, 817km altitude • Downlink at 2 frequencies • Uplink used as kill switch • 4 months mission life

  5. Student Team Size: 7 (usually 25) Departments:AerospaceChemicalCivilComputer ScienceElectricalPhysicsMechanical PRATHAM Core Group (10 members) Comm. Quality Team Power Structure Payload Integration Team OBC Thermal Control Social Goal

  6. Technical Mentors • Prof K. Sudhakar (Aero) • Prof P. M. Mujumdar (Aero) • Prof H. Arya (Aero) • Prof H. B. Hablani (Aero) • Prof S. P. Bhat (Aero) • Prof K. Chatterjee (Elec) • Prof B. G. Fernandes (Elec) • Prof K. N. Iyer (Mech) • Dr K P Ray (SAMEER) • Prof Madhu N. Belur (Elec) • Prof Krithi Ramamritham (CS) • Prof R. K. Pant (Aero) • Prof K. K. Isaac (IIST) • Prof U. N. Gaitonde (Mech) • Prof R. K. Shevgaonkar (PU) • Prof R. N. Banavar (Syscon) • Prof D. K. Sharma (Elec) • Prof R. P. Shimpi (Aero) • Prof Girish Kumar (Elec) • Prof Kavi Arya (CS) • Prof B Bandyopadhyay (Syscon) • Prof C. Amarnath (Mech)

  7. Documentation and Reviews Work done by Pratham Team End of Design Phase Once every 6-10 months Rigorous reviews by the IITB Faculty Mentors & ISAC Engineers IITB Faculty Mentors: 30 Departments:AerospaceComputer ScienceElectricalMechanical Systems and Controls Once every week Reviewed by the Team Once every month Reviewed by the IITB Faculty Once every 2-3 months Reviewed by the ISAC Engineers • Major emphasis on documentation since “We want to preserve our knowledge” • All our documents are available on our website www.aero.iitb.ac.in/pratham/

  8. Timeline Requirements Capture Phase finished Apr 2008 Preliminary Design Phase finished Dec 2009 Launch End of 2011 Conceptual Design Phase finished Aug 2008 Concept feasibility proved to IITB Aug 2007 Detailed Design Phase Aug 2010 Signed MoU with ISRO Sept 2009 Oct 07 Apr 11 Mar 10 Sept 08 Sept 09 20 Team Size = 30 25 20 Two stage selection process Quiz & Presentation Continuity Plan Documentation

  9. Payload Sub-System • Measure Total Electron Count of the Ionosphere over India and France • Expected TEC value is 25±5 TECU (resolution of 0.1 TECU, SNR of 500) • 2 polarized radio signals are transmitted parallely • Faraday rotation changes their angle of polarization • The difference in their polarization angles is measured at the ground station F2 Region F1 Region IONOSPHERE E Region D Region

  10. Communication Sub-System Beacon Rotor • Low bit rate Beacon (145.980 MHz) • CW transmitter, 0.6 Watt power • Resonant Helical/Non-resonant Monopole of 18 cm • High bit rate (1.2kbps) Monopole for downlink of data (437.455 MHz) • FSK transmitter, 0.6 Watt power • Resonant Monopole of 17 cm • NO telecommand • Kill Switch (Uplink) added to satisfy IARU’s constraint for getting license • Resonant Monopole of 17 cm Crossed Yagi Base Station

  11. OBC, ADCS and Power SENSORS SunSensor (LEOS) Magnetometer (Honeywell) Solar Panels On 4 sides (ISAC) GPS (ACCORD) OBC Circuit Power Circuit ACTUATOR Magnetorquer ATTITUDE CONTROL Battery (ISAC)

  12. Systems Engineering • System and Sub-System Requirements • Mission Design • Weight Budget • Configuration Layout • Connectivity Diagram • Integration Sequence Mechanical Subsystems • Structural simulation of the satellite under launch loads • Thermal design of the satellite • Integration with IBL230V2 LVI

  13. Testing and Quality Assurance • Electrical Quality ~0.98 • From quality calculations, at the end of mission life • Mechanical QA ~1 • Validated by testing • Level 1 testing done by individual Subsystems • On Board Computer In Loop Simulations (OILS) • Level 2 testing of Power, OBC, Controls, and Communication • Clean Room built (100,000 class)

  14. Interaction with students from other universities • National Ground station workshops • 11 participating universities building Ground Station for Pratham • MHRD Virtual Experiments • 2 papers published at the International Astronautical Congress 2010 in Prague • Collaboration with IPGP and Paris Diderot

  15. Organizations Supporting Pratham • ISRO • ISAC • VSSC • IIT Bombay • IRCC • CDEEP • AEA • SAMEER • TIFR • Boeing

  16. Thank You

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