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![Page 1: CubeSat Design Guidelines Professor A. Chen Professor J. Juang Teacher Assistant J. Vannitsen 16 Oct. 2012 SPACE SCIENCE AND SATELLITE SYSTEM ENGINEERING.](https://reader034.fdocuments.in/reader034/viewer/2022050714/56649e255503460f94b14923/html5/thumbnails/1.jpg)
CubeSat Design Guidelines
Professor A. ChenProfessor J. JuangTeacher Assistant J. Vannitsen16 Oct. 2012
SPACE SCIENCE AND SATELLITE SYSTEM ENGINEERING COURSE
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- Introduction- Mission Requirements- Mission Objectives- Mission Analysis- Subsystems- Environment Considerations- Structure and Configuration- Technology Readiness Level- Mass Budget- Cost Estimate- Your CubeSat report- Conclusion
Table of Contents
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Introduction
CubeSat 是什麼?
CubeSat concept: In 1999, Bob Twiggs/Stanford University & Jordi Puig-Suari/California Polytechnic State University.
2U: 10cmx10cmx20cm 2Kg (2.6Kg)1U: 10cmx10cmx10cm 1Kg (1.3Kg)
3U: 10cmx10cmx30cm 3Kg (4Kg)
CubeSat 是什麼?
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Introduction
Basic CubeSat Design Specifications driven by its deployer.
For your report use the CubeSat Design Specifications developed by CalPoly.
Freely available here: http://www.cubesat.org/images/developers/cds_rev12.pdf
P-POD = Poly Picosatellite Orbital Deployer
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Mission Requirements
YOUR CUBESAT DESIGN
1. 皮米衛星的大小不得大於 10x10x30cm,重量不得大於 4kg. 2. 軌道限制為 Low Earth Orbit (LEO),也就是地表以上 160km~2000km範圍。軌道傾角 (i)與離心率 (e)不設限 . 3. 通訊系統為 UHF/VHF Band, 通訊速率為 9600bps.
6U Lunar CubeSat Design Example
1. 皮米衛星的大小不得大於 10x20x30cm. 2. Inserted directly to Low Lunar Orbit (LLO),也就是地表以上 100km範圍。軌道傾角 (i)>20°. 3. Payload Narrow Angle Camera (NAC) dimensions 30cmx10cmx10cm, weight 1930g.
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Mission Objectives
YOUR CUBESAT DESIGN
- You should define your CubeSat Mission Objective. - Mostly, the CubeSat Missions include:
Technology Demonstrator; And/Or Earth Remote Sensing.
Advice: Look at the Website List sent by Professor Chen and make some researches by yourself on the Internet for Past, Present and Future CubeSat Missions developed worldwide.
6U Lunar CubeSat Design Example
-To take pictures of the Moon with a Narrow Angle Camera for at least 6 months.
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Mission Analysis
YOUR CUBESAT DESIGN
- Choose a launcher, launch location and date. Note: In reality those information are not always known when a CubeSat project is started. It is done here so you can use specific values to define in STK.
-Determine the orbital parameters (altitude, inclination, orbit period). Note: Data driven by the launcher. Mostly the CubeSats are not main passengers of the launchers, then they depend on the main satellite mission for orbital parameters.
- Compute those information in STK Free: www.agi.com/products/free-software/
6U Lunar CubeSat Design Example
- Launch later half 2015, circular orbit, 100km, altitude inclination>20°.Orbit period: determined to be 7065 seconds (117.75minutes) or 12.229 orbits per Earth day.
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Subsystems
PAYLOAD
AOCSPOWER
OBDH
COMM
EVERYTHING IS LINKED! Modifications on a Subsystem will affect the other Subsystems!
POWER
COMM
PAYLOAD
POWER
COMM
OBDH
PAYLOAD
POWER
COMM
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Subsystems - PAYLOAD
YOUR CUBESAT DESIGN
-In your Payload Definition pay attention to the following parameters: - Mass;- Power Consumption;- Dimensions;- Data output;- Cost.
6U Lunar CubeSat Design Example
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Subsystems - COMMUNICATIONS
YOUR CUBESAT DESIGN
1. Data Rate: The data rate calculation is achieved using the total accrued data per day and the total communication window per day to the ground station. Note: Use the NCKU Tracking Station position for the Ground Station Location and define the total communication window per day to the ground station with STK.
2. Select your Hardware: To select your Communication system you can choose to use COTS (Components On The Shelf). List of products available on the websites below: - ISIS Shop: www.cubesatshop.com- GOM Space Shop: http://gomspace.com/index.php?p=products- Clyde Space Shop: www.clyde-space.com/products- Pumpkin Shop: www.cubesatkit.com
NCKU Tracking Station position
Longtitude: 120°16'32.13" EastLatitude: 22°56'19.76" North
Altitude: 12 meters
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Subsystems - COMMUNICATIONS
6U Lunar Design CubeSat Example
1. Data Rate: The data rate of 863.42bps is based on the average communication window and is assumed that the excess data storage capability can store the data from the shorter communications day to be transmitted on the longer communications days.
2. Selected Hardware:
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Subsystems - OBDH
YOUR CUBESAT DESIGN
1. Data Rate: - Depends on DATA needed to realize your mission AND downlink time of the ground station.
2. Data Storage: - All the data accrued during non-downlink time. Take into account download time of the ground station.
3. Select your Hardware:
To select your OBDH system you can choose to use COTS (Components On The Shelf). List of products available on the websites below: - ISIS Shop: www.cubesatshop.com- GOM Space Shop: http://gomspace.com/index.php?p=products- Clyde Space Shop: www.clyde-space.com/products- Pumpkin Shop: www.cubesatkit.com
OBDH = On Board Data Handling
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Subsystems - OBDH
6U Lunar CubeSat Design Example
1. Data Rate: Requirements: Image of 10MB and 10 images per day and constant telemetry rate of 39.1207bps. The images compressed to 1.6Mb. Total data per day: 19.4Mb, including a 15% margin for overheads (encoding etc.), this increases to 22.3Mb/day.As average downlink time of 430.2 minutes per day total data downlink per day requires a data rate for downlink of 863.42bps.
2. Data Storage: - The minimum data storage requirement: To store data accrued during non-downlink time plus one additional NAC image (15.6Mb + 1.6Mb) is 17.2Mb, using an additional 20% margin this increases to 20.1Mb.Note: Data storage capability should be much higher than this absolute minimum requirement (i.e. per day) to account for ground station down time and shorter communications windows.
3. Selected Hardware:
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Subsystems - POWER
YOUR CUBESAT DESIGN
1. Solar Array Sizing
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Subsystems - POWER
6U Lunar CubeSat Design Example
1. Solar Array Sizing
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Subsystems - POWER
YOUR CUBESAT DESIGN
2. Spacecraft Modes (Definition)
Spacecraft modes will depend on your mission. Note: You can use the below 6U Lunar CubeSat Spacecraft Modes example as a reference.
6U Lunar CubeSat Design Example
For the purposes of determining the spacecraft power requirements six distinctspacecraft modes were defined:1. Imaging, used only when the NAC is taking images;2. Data Dump, used when the spacecraft is down-linking data to the ground station;3. Momentum dump, used when the spacecraft is dumping the momentum from its reaction wheels using the gas propulsion; 4. Nominal, which is used for the majority of the time when the spacecraft is only sun pointing;5. Slew;6. Safe, used in failure modes and for use during the maximum eclipse periods.
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Subsystems - POWER
YOUR CUBESAT DESIGN
2. Spacecraft Modes (power consumption)
You should define the power consumption of each subsystem depending on the mode. Note: You can use the below 6U Lunar CubeSat Example Table as a reference.
6U Lunar CubeSat Design Example
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Subsystems - POWER
YOUR CUBESAT DESIGN
3. Select your Hardware:
To select your POWER system you can choose to use COTS (Components On The Shelf). List of products available on the websites below: - ISIS Shop: www.cubesatshop.com- GOM Space Shop: http://gomspace.com/index.php?p=products- Clyde Space Shop: www.clyde-space.com/products- Pumpkin Shop: www.cubesatkit.com
6U Lunar CubeSat Design Example
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Subsystems - AOCS
YOUR CUBESAT DESIGN
1. Pointing Requirements:
The attitude and orbit control subsystem accuracy is driven by your payload pointing requirements.
2. Torque Analysis:
Solar Radiation Torque Calculation Gravity Torque Calculation
AOCS = Attitude and Orbit Control System
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Subsystems - AOCS
6U Lunar CubeSat Example
Solar Radiation Torque Calculation
Solar Radiation Torque Calculation
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Subsystems - AOCS
YOUR CUBESAT
3. Select your Hardware: To select your AOCS you can choose to use COTS (Components On The Shelf). List of products available on the websites below: - ISIS Shop: www.cubesatshop.com- GOM Space Shop: http://gomspace.com/index.php?p=products- Clyde Space Shop: www.clyde-space.com/products- Pumpkin Shop: www.cubesatkit.com
6U Lunar CubeSat Example
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Environment considerations
1. Radiations
2. Thermal
Thermal analysis are performed taking into account the temperature which is influenced by the Space environment AND by the satellite systems.
Note: For your study it is not necessary to take into account the radiations and the thermal environment as this require many analysis. Take it into account at least basically (in your geometric configuration, do not expose your electronic boards directly outside of the CubeSat, do not put all the subsystems which emit heat very close to each other, etc…).
Calculate the radiations received by each subsystem
If yes, add shielding or change susbsytem location
Verify if radiation dose is too high
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Structure and Configuration
YOUR CUBESAT
Select your structure:
To select your Structure you can choose to use COTS (Components On The Shelf). List of products available on the websites below: - ISIS Shop: www.cubesatshop.com- GOM Space Shop: http://gomspace.com/index.php?p=products- Clyde Space Shop: www.clyde-space.com/products- Pumpkin Shop: www.cubesatkit.com
6U Lunar CubeSat Example
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Structure and Configuration
YOUR CUBESAT
Configuration:
To propose a preliminary design of your CubeSat you can use CATIA or FreeCAD. FreeCAD available here for free: http://sourceforge.net/apps/mediawiki/free-cad/index.php?title=DownloadNote: Use it to predict the centre of mass and inertia tensors (for use in torque calculations – AOCS section). After proposing a configuration you have to produce a table for the Mass budget!
6U Lunar CubeSat Example
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Technology Readiness Level
Definition: Assess the maturity of evolving technologies (materials, components, devices, etc.) prior to incorporating that technology into a system or subsystem.
Define the TRL Level of your subsystems. Get a rough assessment of the feasibility and risk of your mission. Help to define the mass margins.
TRL 是什麼?
YOUR CUBESAT
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Technology Readiness Level
6U Lunar CubeSat Example
Low because developed by students
Low because only laboratory tests done.
Note: In your study only give a number for your TRL no letter needed.
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Mass Budget
YOUR CUBESAT
Component Mass Margin Mass inc. margin
Component A
Component B
...
Total
Additional System Margin (Conservative = 20%)
Total
Margins are applied according to the TRL of the components and the confidence in the COTS mass when considering modification
Take into account general margin + margin for electrical and data harness
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Mass Budget
6U Lunar CubeSat Example
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Cost estimate
YOUR CUBESAT
COST ESTIMATE
Satellite Components
Ground Support, Equipment, AIT…
Launch
Note: In your study only give a cost estimate for the Satellite components
Satellite Components
Ground Support, Equipment, AIT…
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Cost estimate
6U Lunar CubeSat Example
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Your CubeSat report
Introduction
1. The CubeSat Mission1.1 Mission Requirements1.2 Mission Objectives1.3 Mission Analysis
2. Subsystems2.1 Payload2.2 Communications2.3 OBDH2.4 Power2.5 AOCS
3. Structure and Configuration
4. Technology Readiness Level
5. Mass Budget
5. Cost Estimate
Conclusion
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Conclusion
VOLUME AND MASS OF
COMPONENTS GO UP
VERY FAST!
WORK AS A TEAM!
ALL YOUR SUBSYSTEMS ARE LINKED!
REMEMBER!
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謝謝您的觀賞
SPACE SCIENCE AND SATELLITE SYSTEM ENGINEERING COURSE