Satellite Ground Station - sites.ualberta.cadelliott/cmpe490/projects/2015w/final-slide… · Orbit...
Transcript of Satellite Ground Station - sites.ualberta.cadelliott/cmpe490/projects/2015w/final-slide… · Orbit...
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Satellite Ground Station
Andrew Keller Ranek Kiil Jacob Ortt Bryson Peeters
ECE 492 — Winter 2015
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AlbertaSat RefresherSatellite: Ex-Alta 1
• Alberta’s first satellite
Mission: QB50
• collect scientific measurements in lower ionosphere
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Mission Details
• 300-400 km
• Fluxgate magnetometer and Langmuir Probe
• ~2 year orbit
600 km
300 km
85 km
45 km
12 km
EXOSPHERE
THERMOSPHERE
MESOSPHERE
STRATOSPHERE
TROPOSPHERE
IONOSPHERE
E
F
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ObjectivesAutomated & integrated solution to track satellite and communicate with it.
• Point antenna at and track satellite
• Tune radio to satellite’s frequency
• Store and decode signals from space
• Send commands to satellite when it passes
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Tracking Communications
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Orbit Prediction
• Satellites tracked by NORAD
• Orbital elements + time + location → azimuth and altitude
QB50P1 1 40025U 14033R 15097.15808165 .00003222 00000-0 36684-3 0 9997 2 40025 97.9587 357.3098 0014668 59.2887 300.9780 14.86830496 43246
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N
E
S
W
Satellite
Station
Azimuth
Altitude
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Ground Station Design
• Download orbital data from web
• PC predicts satellite passes
• Send (altitude, azimuth) to controller
• Controller turns rotator
Main PC
Rotator Controller
Antenna
Rotator Motor
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Communications Overview• Ultra High Frequency (~430 MHz)
• Focus on downloading scientific data
• Two types of commands:
• real time
• scripted
Main PC
Terminal Node Controller
Radio
Satellite
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CubeSat Space Protocol
• Similar to IP, but lighter weight
• 32 bit vs. 160 bit header
Bit offset
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 Priority Source Destination Destination
PortSource Port Reserved
H M A C
X T E A
R D P
C R C
32 Data (0 – 65535 bytes)
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Communications Demo
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Results
- - - - - • - - • - - - - -T O K Y O
8-52-11 MINAMI-SENJYU ARAKAWA-KU TOKYO-TO JAPAN
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Questions?