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PROX-1:
AUTOMATED PROXIMITY OPERATIONS
ON AN ESPA CLASS PLATFORM
SSC15-IX-4
AIAA Conference on Small Satellites
12 August 2015
Logan, UT
Kevin J. Okseniuk, Sean B. Chait,
Peter Z. Schulte, and Dr. David A. Spencer
Georgia Institute of Technology
Space Systems Design Laboratory
SYSTEM OVERVIEW
• 66.5 kg wet mass
• 22” x 24” x 12” envelope (ESPA-class)
• Launching on 2016 on STP-2 launch
• Orbit: 720km circular, 24° inclination
• University Nanosatellite Program 7th
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AUTOMATED PROXIMITY OPERATIONS
• Passive Thermal Imaging
• Image-Based Relative Navigation
• Automated On-board Guidance & Control
• Low-Thrust Propulsion
• Advanced Small Sat Hardware Demonstration
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MISSION GOALS
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Mission Objective 1:Successful health checkout of spacecraft and characterization of new hardware technologies
Mission Objective 2:Successful deployment and relative orbit determination of LightSail
Mission Objective 3:Rendezvous with LightSail
Mission Objective 4:Automated trajectory control for formation flight and natural motion circumnavigation
The Planetary Society
LV Separation & Detumble
CubeSat Deployment & Orbit Determination
Rendezvous Proximity OperationsSail Deployment & Inspection
Initial Acquisition & System Checkout
PASSIVE IMAGE BASED NAVIGATION
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• THESIS-IR
– 640 x 512 thermal imager
• THESIS-VIS
– 1384 x 1032 visible imager
• Imaging Processing algorithms
– Developed by GT for relative state
estimation
– Hosted on imaging payload computer
Michael Veto, ASU
Michael Veto, ASU
COLD GAS PROPULSION UNIT
• Designed and manufactured by UT
Austin’s Texas Spacecraft Lab
• Cold gas thruster
– R-236fa
• Non-toxic
– 50 mN thrust
– Max pressure of 100 psi at 56°C
– 15 m/s
• 3D printed
– Accura Bluestone material
– Tank and plumbing printed as one
contiguous piece
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Texas Spacecraft Laboratory
Georgia Tech High Power Electric Propulsion Laboratory
MICRO-SAT CMG’S
• Developed and manufactured
by Honeybee Robotics
• Funded through AFRL SBIR
• Provide on-orbit qualification
for small satellite CMGs
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Honeybee Robotics
Honeybee Robotics
ADVANCED GN&C
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SCHEDULE HIGHLIGHTS
• 2011: Selected for UNP-7
• 2012: Systems Design
• 2013: Winner of UNP-7
• 2014: Subsystem Development
• 2015: Integration & Testing
• 2016: Launch & Operations
• 2017: Extended Operations
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SpaceX
SmallSat
STUDENT INVOLVEMENT
• Student-led, faculty-advised
• ~60 students per semester
• 150+ students since 2011
• Collaboration across teams,
disciplines, and universities
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QUESTIONS?
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