floating satellite presentation

8/6/2019 Floating Satellite Presentation

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Floating Satellite

Sergio Montenegro.

Frank Dannemann.

John Richardson

Norbert Toth.

Muhammad Faisal.


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Folie 2

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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Folie 5

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.



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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.



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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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Folie 13

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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Folie 14

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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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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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.

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