Post on 08-Apr-2018
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Floating Satellite
Sergio Montenegro.
Frank Dannemann.
John Richardson
Norbert Toth.
Muhammad Faisal.
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Innenhalt
DLR Bremen
Floating Satellite
Mechanik
Block Diagram
Motor
ARMZigbee Module
Motor Steuerung
Drehmessung
Irda
CameraZusammenfaussung
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DLR Bremen
The Bremen site of the German
Aerospace Center (DLR) has been the
home of the Institute of Space Systems
since 2007.
The institutes main focus is on:
Spaceflight systems analysis
Spaceflight systems technology
Spaceflight application
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Konzept
Floating Satellite
The Float-Sat is a demonstration model device,
consisting of mechanical and electronic
mechanisms contained within a floatable
waterproof hemi-spherical hull designed tooperate on water.
Top View Side View
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Mechanics Of Floating Satellite
The Diameter of the hemisphere is somewhere
between 10 cms and 25 cms.
It should be able to rotate on its X and Y-axes
and it should be able to freely turn on the Z axis.
An engine is located on the Z-axis (vertical axis
of rotation of the hemisphere) with an adjustable
weight that makes no contact with the outside
cover.
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Located in the centre is an electronics box
consisting of a battery that produces approx. 5 volts
and an external charger engine controller (for speed
and performance electronics).
At the top on the Microcontroller platform an
embedded microcontroller is mounted (based on
arm CPU).
The microcontroller has the following approximate
mass: 90 x 60 x 15 mm3.
Mechanics Of Floating Satellite
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The energy for this demonstrator comes
from the battery. We will require approx. 1watt and 5 volts for the engine
consumption and the engine control. With
a total battery charge it should work for
approx. 5 minutes.
The maximum rotating speed of the
Floating-Sats should be approx. one rotation
at approx. 5 seconds.
Mechanics Of Floating Satellite
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Block Diagram of the Operation
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ARM- Modul
- MCU: LPC2468
- ARM7TDMI-S Prozessor, 72 MHz
- 16MB SDRAM
- 128 MB NAN Flash
- 4 UART
- UART 3 mit IrDa support
- 160 GPIO
- 2 PWM
- 4 Timers/Counters
Avionics Of Floating Satellite
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LPC-E2468 uC Linux development
prototype board with LPC2468
USB,Ethernet, SD/MMC in credit
card format.
Avionics Of Floating Satellite
RODOS operationg systems
developed by DLR is successfullyon the ARM processor using this
development board
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ZigBee - Modul
- Cortex-M3 based SOC
- 12 kB RAM
- 128 kB flash
- 24 GPIO
- 2,4 GHz ISM Band
- on-board ceramic antenna
- 19dBm output power
- Telegesis Firmware
- AT Commands
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Motor Steuerung
Mit PWM Signal (Puls Wight Modulation)
50 Hz
1,5 ms neutral
1 ms nach rechts
2 ms nach links
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Drehmessung
Transmissive Optical Sensor
Transistor Ausgang zu dem Counter des ARM-Moduls
40 Zhne auf dem Motor
Zhlen wie viel Zhne / sec
Dann teilen mit 40
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IrDa
Infrarotlicht fr die Datenbertragung
Peer-to-Peer
Geringe Energieverbrauch
in den Weg des Lichtes darf keine Hindernisse
serielle asynchrone Datenbertragung mit 115 kbps, 4 Mbps oder 16 Mbps Datenrate
Die bertragung funktioniert innerhalb 1 m oder 20 cm
Wellenlnge: 850 - 900 nm
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ZigBee
IEEE 802.15.4 Norm
Ersetz das Loch, was WiFi und Bluetooth nicht reichen kann
die Reichweite zwischen 10 m und 75 m
ISM-Band: in Europa ist das 868 MHz und 2,4 GHz
Theoretisch bei 2,4 GHz 250 kbps, bei 868 MHz 20 kbps
zwei Zustnde, aktiv und sleepunter 15 ms bis zum Aktiv Zustand
mit zwei AA Batterie Jahre lang
Q-PSK Modulation fr die Datenbertragung
MESH, STAR, CLUSTER
Koordinator: organisiert und verwaltet das Netz, whlt den Funk-Kanal aus, PAN
Router: fr die berspielung FFD (Full Function Devices)Endgert: einfache Gerte, melden sich an einem Router an, RFD (ReducedFunction Devices), z.B.: Lichtschalter und Lampe
Die Bitbertragung-Schicht 127 Byte lnge Pakete mit CRC-Kod
64 bit Adresse, oder kurze 16 bit Adresse von Koordinator
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Photonics Of Floating Satellite
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Photonics Of Floating Satellite
Printed Circuit board for the camera
Interfacing is designed in ALTIUM
Designer(TM).
2.5 Volt power supply is used
for analog.
1.8 Volt for digital Core.
3.3 Volt for I/O pins.
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Photonics Of Floating Satellite
The camera is controlled through Serial
Camera Control Bus (SCCB).
The camera module is interfaced with
Microcontroller board with External I/Os of
the board.