AubieSat 1

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Aubie-Sat 1
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Mission

• To prove that students can design, build and
  operate satellites
• To test a GaN UV Sensor in the Space Environment

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Mission
Launch The launch is currently planned to be
onboard a Russian Dnepr rocket from Kazakhstan,
Spring-Summer 2008. Once in low earth orbit, the
satellite will be deployed using the standard
Poly Picosatellite Orbital Deployer (P-POD).
Orbit -700 km altitude -Sun-synchronous,
near-polar orbit -98 inclination / 98 minute
orbit period
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Attitude Determination Control
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• Mass- 8g
• Power- 0
• Dimensions
• Magnet - (3/16)in X 1in
• Damper Thin, x

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Command Data Handling
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Finite State Machine

• model of behavior composed of a finite number of
  states, transitions between those states, rules,
  and actions
• model for software

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Example Normal Mode
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Normal Mode Flow Chart
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Ground Station Commands
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Communications
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Antenna

• Half-wave dipole
• Material
• Nitinol
• More versatile
• Tape-measure
• Cheap and easy

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TNC

• PicoPacket
• Z80181 Microprocessor
• TCM3105 Modem
• Mass 63 g
• Volume 8x6x1.2 cm
• Cost 179
• Voltage 7-14 V
• Current 50-70 mA
• Data Rate 1200 baud

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Tx VX-2R

• Mass 132 g (in case)
• Voltage 7 (3.2- 7.0) V
• Current
• Tx 1.5A
• Rx 150 mA
• Tx power output / 2 W

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Beacon

• Usually just a pilot light
• Allows ground station to spot satellite and
  command it to turn on primary Comm system
• With Morse code adds two features
• Predetermined recording with call sign
• Secondary communications system
• Hardware
• CW transceiver
• Microcontroller with Morse code software

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Beacon continued

• CW transceiver
• Pixie II
• Morse code generator
• TiCK 4

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Electrical Power System
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Summary of EPS Subsystem

• Batteries 41 g /each
• Solar Cells 4.2 g/each
• Mass Total 86.2 g without circuit

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Ground Station
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Radio TNC

• ICOM 910-H
• Designed for Satellite Communications on 70cm
  2m bands
• KPC-3
• DB-9 to ACC on ICOM 910-H
• DB-25 to DB-9 on CPU

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NOVA

• Our tracking program
• Tracks multiple satellites in real-time orbit
  around the earth.
• Shows earth with day and night as well as radar
  and flight paths of objects in orbit.

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• NOVA requires only a few inputs
• Use Keplerian Elements to track satellites
• Inclination
• Longitude of ascending node
• Argument of periapsis
• Eccentricity
• Semimajor Axis
• Mean anomaly at epoch

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Doppler Shift Software

• Ham Radio Deluxe allows shifting of ICOM
  frequency to account for Doppler Shift
• ICOM connected to CPU via LCU-3

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VSWR 1.61 Max Feed Impedance 50 ohms Power
Handling 600 Watts
Frequency range 432-440 MHz Gain 14.15
dbdc Beamwidth 30 degrees Polarity Circular Boo
m Length 117
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Structures
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Data Summary

• Mass 332.44 grams
• Power none
• Volume899.85 cc

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Structure
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