COMP4970 Embedded Systems for Space and Satellite Applications

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COMP4970 Embedded Systems for Space and Satellite Applications

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A small and exclusive club: many have tried, but few have succeeded ... camera. magnet- ometer. Microcontroller. Atmel Atmega AVR 8-bit cpu, 128L ... – PowerPoint PPT presentation

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Title: COMP4970 Embedded Systems for Space and Satellite Applications

1
COMP4970Embedded Systems for Space and Satellite
Applications

Richard Chapman
115-230 MWF,
Shelby 1124
Summer 2008

2
AubieSat Program

Website
http//space.auburn.edu/aubiesat-1/
Auburn Student Space Program (AUSSP), Dr. J-M
Wersinger
AHAB high-altitude balloon program

3
Aubiesat 1 Prototype
4
What is a cubesat?

10cm x 10cm x 10cm
1 kg mass
ejected from a P-pod that holds 3 cubes
launched by a variety of rockets

5
Cubesats

Polar orbit
500-600km in height
Orbit takes approx 100 minutes
about 10 minutes above the horizon on a given
pass
3-4 pass/day in Auburn

6
Launch sources

ITC Kosmotras Dnepr, brokered by CalPoly for
U.S.A. schools
Space-X or other startup
ESA
NASA

7
Launch is expensive

Minimum 50K to launch
Est. 50K to develop a cubesat
NASA is much more expensive, but less risky
Startups are the most risky

8
But it is very cool.
9
Space is harsh

Temperature extremes/cycling
Vibration and acceleration while in launch
vehicle
Ionizing radiation
No chance to repair
Lossy radio link (-60dB)

10
University satellite launches

A small and exclusive club many have tried, but
few have succeeded
The successful are not always the famous, well
funded schools

11
Sometimes youre the windshield

Cal Poly, San Luis Obispo
University of Tokyo
University of Louisiana, Lafayette
University of Bogota, Colombia
U.S. Naval Academy

12
And sometimes youre the bug June 6, 2006

A much-heralded attempt to launch 15 CubeSats
built by 11 universities and one private company
failed this week All of the satellites appear to
have been lost.

13
Contd

The Dnepr-1LV rocket lifted off from Russia's
Baikonur Cosmodrome in Kazakhstan at 1943 UTC on
July 26. Various accounts indicate that the
mission went awry less than two minutes after
liftoff when the first stage failed to separate
on time, causing an emergency shutdown of the
rocket's main engine.

14
Satellite Systems

Systems Engineering (standards, interfaces)
Structure (thermal and mech)
Electric Power System (EPS)
Command and Data Handling (CDH)
Communication (COM)
Payload (PLD)
Attitude control and det. (ACD)
Ground station (GND)

15
Electrical Systems
t
COM
CDH
memory
yaesu vx-2r
tnc-x
sensors
mcu
switch
secondary rcvr
GND
radio
EPS
PLD
camera magnet- ometer
solar cells
tnc
user interface
regulators
charger
AX-25 sw
batteries
16
(No Transcript)
17
Microcontroller

Atmel Atmega AVR 8-bit cpu, 128L
RISC architecture, 32 registers
128K flash, 4k EPROM, 4k SRAM
6 8-pin general purpose I/O ports
JTAG ICE capable
1 to 16 Mhz clock, most instructions single cycle

18
Interfaces

2 USART serial interfaces
Serial Peripheral Interface (SPI)
Inter-Integrated Circuit (I2C) bus
general purpose I/O (pin configurable for one of
the above interfaces or for gpio)

19
Software Toolchain

Atmel AVR tools C compiler and loader
MicroC/OS-II real-time kernel and command line
loader/tools, have a port to the AVR chips
Download via serial port
STK500/501 development board

20
CDH Tasks