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Project ASCEND!
Embry-Riddle Aeronautical UniversitySpring 2014
Presented By:Ankit Jain – Project Manager
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Team Organization
• Ankit Jain: Project Manager
• Ben Anderson: Assistant Project Manager
• Patrick Deskin: System Integrator
• Brigette Cochran: Software Engineer
• Dallas Hodge: Hardware Engineer
• Austin Leonard: Structural Engineer
• Loren Williams: Structural Engineer
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Presentation Overview
• Project Overview
• Computer Aided Design (CAD) & Rapid Prototyping
• Fabrication
• Hardware & Software
• Attitude Determination
• Flight Results
• Future Developments
• Acknowledgments
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Project Overview
• Accurate attitude determination
• Real-time implementation
• PCB manufacturing
• 26-sided structure
• Booms for stabilization
• Standard clamp rod attachment
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CAD & Rapid Prototyping
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Early CAD Design
CATIA V5 R17
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Final CAD Design
Red: Switch Mount
Blue: IMU and Power Regulator Mount
Yellow: 9V Battery Mount
Purple: PCB and Data Logger Mount
Green: Camera Mount
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Rapid Prototyping
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Fabrication
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Fabrication
• Bi-directional carbon
• NOMEX honeycomb
• 2/10” styrofoam insulation
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Fabrication
• Epoxy
• Fiberglass reinforcement
• Microballoons
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Fabrication
• Lexan plate for camera window
• Velcro door mechanism
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Assembly
• All mounts are removable
• Bolted into place
• Central rod holds all mounts in place
• Booms screw into
mounting block
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Hardware & Software
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FlightSoftware / Hardware
• Dr. Isenberg’s data logging system utilizing a PIC processor
• 3.3V and 5V power regulators
• IMU board
• PCB – signal routing & conditioning
• Video recorder
• Data Analysis: MATLAB
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Attitude Determination
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Attitude Determination
• 23 solar panels as sun sensors
• IMU consisting of a 3-axis rate gyroscope and 3-axis accelerometer
• Two vector attitude determination using Wahba’s Problem o Acceleration Vectoro Sunlight Vector
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IMU Calibration
• Both rate gyroscope and accelerometer calibrated
• Cross-coupling effects considered between axes
• Verification of calibration
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Light Measurement Vector
• Orientation of each panel with respect to x, y, and z axes of gondola (i.e., body frame)
• Transformation of data into light measurement vector with respect to the body frame
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Flight Results
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Acceleration Vector
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Angular Velocity Vector
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Light Measurement Vector
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Attitude (Quaternion)
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Results Comparison
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Future Developments
• Recruit more software engineers
• Debug I2C
• Complete external SD & file system
• Real-time implementation
• Moving to C++ for libraries containing array math
• Determine better attitude estimation algorithm
• Attitude control
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Acknowledgements
• Jack Crabtree – ERAU & ANSR
• Dr. Gary Yale - ERAU
• Dr. Douglas Isenberg - ERAU
• Jim Weber – ERAU
• Dr. Brian Davis - ERAU
• Patrick David - ERAU
• Chris Smith – ERAU
• Ben Ellefson – Powerfilm Solar
• NASA Space Grant Members
• University of Arizona