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Akoya - BanditOrbitVision
Washington University in St. LouisSchool of Engineering and Applied
Science
Erin Beck Justin Char
Lane Haury Cash Carr
Goals:
•Simulate the complete Akoya-Bandit camera-to-radio system
•Photograph LED array as it would appear on Akoya in daylight
•Photograph the Earth as it would appear to the Akoya Earthside camera
Akoya - Bandit:
• Bandit is a 4 kg service vehicle housed within Akoya, a 25 kg parent satellite. On orbit, Bandit will undock from Akoya, navigate relative to it while completing simple to complex tasks, and redock.
• Bandit navigates by observing a pattern of LEDs on Akoya’s surface and calculating position.
• Two cameras aid navigation:
•BanditCam: b/w camera that photographs LEDs, from which software determines position
•AkoyaCam Dockside: color camera looking at Bandit from the dock, used for backup sighting of Bandit
• One additional camera:
•AkoyaCam Earthside: color camera to photograph Earth
SHOT II:
• BanditCam:
•Photographs sample LED array (b/w)
•Transmits locally over 900 MHz radios, simulating the link between Bandit and Akoya. Then transmits over 2.4 GHz radios to ground, simulating the link from Akoya to ground.
• AkoyaCam Earthside:
•Photographs Earth horizon (color)
•Transmits directly over 2.4 GHz radios to ground.
• Accelerometer:
•We hope to have an accelerometer as a secondary position sensor on Bandit. SHOT II includes one accelerometer; we are measuring its sensitivity.
Mass: 1.62 kg before tape
Power: 20 1.5V Li batteries (72 W-hr for components, 18 W-hr for heaters)
Radio frequencies: 900 MHz at 100 mW, 2.4 GHz at 1 W
Balloon attachment: 1/4 inch threaded brass rod through center, attached with washer and
nut on each end
• Drop Test
• Stair Pitch Test
• Whip Test
• Cooler Test
•Table Test:
•Photographs successfully downlinked across the table
•At 115200 baud, we receive one 360x240 b/w image in ~30 sec or one 360x240 color image in ~80 sec.
Demonstrate end-to-end feasibility and functionality of Akoya-Bandit OrbitVision system.
• Radios: Operate without interfering with each other
•Lab test showed no interference. We could use the exact same system at higher power on orbit.
• BanditCam: See LEDs. We may not be able to distinguish different shades as different colors, but we expect that the 100 millicandela Super Blue LEDs will be most visible.
• AkoyaCam Earthside: We receive clear long-distance images, currently in one color only.
• Accelerometer: The manufacturer claims extreme sensitivity, but it is unproven. We expect some readings, but have no prediction of magnitude.
• Internal layout of components
• Mobile Ground Station User Interface
• End-to-end demonstration of BanditCam
•Includes the following components and their connections:
•BanditCam
•900 MHz transmitter and receiver
•Frame Capture Board
•Atmel (ATmega128)
•2.4 GHz transmitter and receiver
•MGS computer