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HASP HELIOS II 2013

HASP HELIOS II 2013. Undergraduate Space Research Symposium University of Colorado Boulder. Presenters: Caleb Lipscomb and Jon Sobol. High Altitude Student Platform (HASP). Supported by the NASA Balloon Program Office (BPO), run by LSU Max Altitude: approx. 36km

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HASP HELIOS II 2013

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  1. HASP HELIOS II 2013 Undergraduate Space Research Symposium University of Colorado Boulder Presenters: Caleb Lipscomb and Jon Sobol

  2. High Altitude Student Platform (HASP) • Supported by the NASA Balloon Program Office (BPO), run by LSU • Max Altitude: approx. 36km • 15 to 20 hours of flight time • 11 million cubic foot helium Balloon • 12 Student Payloads • 8 small 3 kg payloads • 4 large 20 kg payload • HELIOS II, Large payload University of Colorado Boulder

  3. Current Solar Observation • Orbital Platforms • Expensive to develop and launch into space, cost limits access. • Advanced Composition Explorer (ACE) – $106.8 Million • Solar and Hemispheric Observatory (SOHO) - $1.05 Billion • Ground Based • Face interference from the atmosphere, lowering the quality of the images • High Altitude Balloons • Low Cost • Ascended above 99.5% of atmosphere University of Colorado Boulder

  4. Hydrogen-Alpha Exploration with Light Intensity Observation System (HELIOS II) Mission Objectives: • Observe and capture images of the Sun in Hydrogen Alpha wavelength and to identify sun spots in those images. • Design and implement a system to locate the Sun in the sky and orient cameras towards the sun. • Prove the viability of high altitude balloon solar observation during a Colorado Space Grant Consortium (COSGC) sponsored HASP flight. University of Colorado Boulder

  5. Hydrogen Alpha Sun Spots • 656.28 nm • In visible light range • Mid Chromosphere of the Sun • Average Sunspots: 10,000 km to 50,000 km in diameter • Solar Cycle max University of Colorado Boulder

  6. HELIOS II Design • Attitude Determination and Control System (ADCS) • Solar Wavelength Imaging System (SWIS) • Electronic Power System (EPS) • Command and Data Handling (C&DH) • Structure and Thermal University of Colorado Boulder

  7. Solar Wavelength Imaging System (SWIS) • 2 cameras • Science Camera - Identify Sun Spots • ADCS Camera - Characterize performance of Attitude Determination and Control System (ADCS) • Imaging Source “51”Series CCD Cameras • 1600 x 1200 pixel CCD chip • Hydrogen Alpha filtration system University of Colorado Boulder

  8. Science Camera Magnification • 2 Lenses • Fov: • Vertical ϕ Axis: 1.56° or 1° 33’ 30.1” • Horizontal θ Axis: 2.08° or 2° 4’ 40.1” University of Colorado Boulder

  9. ADCS Camera Magnification • 1 Lens • Fov: • Vertical ϕ Axis: 15.5° • Horizontal θAxis: 20.1° University of Colorado Boulder

  10. Filtration System • 400 nm Dichroic Longpass Filter (UV filter) • Hot Mirror (IR filter) • Neutral Density Filters • Narrow Bandpass Filter (Hydrogen Alpha) • 656 nm, 10 nm bandwidth University of Colorado Boulder

  11. Science Camera: Expected Results • Picture: 1600 px by 1200 px University of Colorado Boulder

  12. Sun: approx 417px in diameter • 10,000 km: 3 px in diameter • 50,000 km: 15 px in diameter • 1 px: approx. 3333 km University of Colorado Boulder

  13. Structure Overview Photodiodes ADCS SWIS Electrical and Computing Housing Aluminum Frame Mounting Plate Triangular Trusses University of Colorado Boulder 13

  14. HASP Interface 14.9 University of Colorado Boulder

  15. Thermal • Motor drivers and CPU to be heat sinked to outer aluminum structure • Entire platform to be painted white • Higher emissivity • No reflective interference • Excess aluminum to be used in the electrical and computer housing structure to dissipate heat University of Colorado Boulder

  16. Electrical and Power Systems (EPS) • Power Provided by HASP Platform • EDAC 512 connector • 30 Volts at 2.5 Amps • Converts HASP power to power required by payload systems • Arduino Due • Monitor current and voltage • MOSFETs University of Colorado Boulder

  17. Circuit Diagram University of Colorado Boulder

  18. Command and Data Handling (C&DH)

  19. Overview Discrete Commands: • Main Computer – Pandaboard • Communication between subsystems • Store images • Solid State Drive • Environmental Sensors: • Accelerometer • Pressure Sensor • Thermocouples • Signal relay: MUX • Analog to digital converter • Health and Status Downlink University of Colorado Boulder

  20. Communication ADCS Digital signal to Pandaboard confirming orientation Digital signal to ADCS to start orienting HASP Platform Pandaboard Temperature sensors Ground Station Picture sent to Pandaboard thereby informing it to signal ADCS to start orienting Digital signal to SWIS to take picture SWIS University of Colorado Boulder

  21. 2 Motors • Arduino DUE • 2 Photodiode Arrays • Theta (Θ) Array • Phi (Φ) Array Attitude Determination and Control System (ADCS) Theta (Θ) Array Phi (Φ) Array Phi Motor Theta Motor

  22. Arrays Theta () Photo Diode Array Phi (Φ) Photo Diode Array • 3D Printed at ITLL • Made out of Nylon/Acrylic Composite • Theta sensor has 14 photodiodes and Phi Sensor has 6. • Designed for modularity and ease of access University of Colorado Boulder

  23. System and Controls Overview University of Colorado Boulder

  24. ADCS Orientation Process • C&DH sends ADCS command to reorient. • ADCS collects Theta Plane photodiode readings • ADCS centers to highest intensity source • ADCS collects phi plane photodiode readings. • ADCS centers to highest intensity source on phi plane • ADCS retakes theta plane readings and reorients. • ADCS initiates Symmetry Test • ADCS sends command to C&DH that orientation has been completed. • C&DH sends command to SWIS to capture an image University of Colorado Boulder

  25. Concept of Operations Night Float Day Float 36 km Ascent Descent Altitude Launch Landing Flight Timeline T 0 hrs Launch- System powered off T 2 hrs Float Altitude- Power on and check H+S of all systems T 2.5 hrs Begin Mission Operations T 10 hrs Power off Payload T 20 Begin Descent T 22 hrs HASP Platform Lands University of Colorado Boulder

  26. System Initialization Procedures 2. EPS activates power to Pandaboard. Pandaboard reports initial health and status to ground 1. Discrete Cmd given by ground station to power on HELIOS II 3. EPS powers on ADCS, ADCS reports H+S to Pandaboard 4. Discrete command ADCS to begin operations 5. Run mission operations: track sun & capture images University of Colorado Boulder

  27. Flight and Results • Current Flight date: August 26 • Identify at least one sun spot • Observe same sun spot in 3 separate pictures • ADCS success: • Observe sun in 10% of Science camera images • Exact performance characterized by ADCS camera • Prove viability of high altitude balloon observatories University of Colorado Boulder

  28. Questions? University of Colorado Boulder

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