building low cost cubesat - gauss srl · 2018. 2. 14. · introduction - why cubesats? • the...
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Building Low Cost Cubesat: Guidelines and Design Approach
Ibtissam Latachi
PPR / 2015 /12
4th IAA Conference on University Satellite Missions and
Cubesat WorkshopIAA-AAS-CU-17-06-02
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PLAN
Introduction
Methodology
Mission Analysis Processes
System Engineering Processes
Platform: Available Options and Trade-offs
Management Processes
Conclusion & Futur Perspectives
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Introduction - Why Cubesats?
• The Cubesat model provides almost all of the benefits
of a larger program at a fraction cost.
• Cubesats are valuable educational tool to leverage
aerospace capacity building since emphasis is
put on the “learn-by-doing” process.
4th IAA Conference on University Satellite Missions and Cubesat Workshop
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Introduction –MASAT 1Objectives:
1. Enhance capacity building in
space technology and
spacecraft engineering
through designing and
integration of both the space
and ground segment
2. Establish a reliable radio link
with low-cost mission
control ground station for
control, command, and
telemetry retrieval.
3. On-orbit reconfiguration and
testing of the FPGA based
secondary OBC.
4th IAA Conference on University Satellite Missions and Cubesat Workshop
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Methodology –ECSS Framework -
4th IAA Conference on University Satellite Missions and Cubesat Workshop
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Methodology - Approach –
Concurrent System Engineering
Approach
Iterative: to cope with eventual requirements
changes and all the discrepancies which may arise
during the design process,
Recursive: to design next lower layer subsystems
or to realize next upper layer elements within the
system structure
4th IAA Conference on University Satellite Missions and Cubesat Workshop
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Mission Analysis Process
4th IAA Conference on University Satellite Missions and Cubesat Workshop
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System Engineering Processes
4th IAA Conference on University Satellite Missions and Cubesat Workshop
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Platform: Structure and SC configuration
Structure Satellite configuration
Physical configuration:
Layers / Slots
Logical configuration:
Centered / Distributed
4th IAA Conference on University Satellite Missions and Cubesat Workshop
Mass budget:
The CDS standard limits the mass of
the Cubesat to a maximum of 1.4 kg
with a security margin of 10%.
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Platform: Attitude Control
Passive attitude control:
+ No energy consumption
+ No dedicated card slot
+ Easy configuration
- No pointing accuracy
4th IAA Conference on University Satellite Missions and Cubesat Workshop
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Platform: CommunicationSpace segment Ground segment
4th IAA Conference on University Satellite Missions and Cubesat Workshop
Communication system parameters:
Transmitted Power , Gains , Noise
Temperature
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Platform: Communication
4th IAA Conference on University Satellite Missions and Cubesat Workshop
Choice criteria:
Power efficiency
Bandwidth efficiency
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Platform: Communication
4th IAA Conference on University Satellite Missions and Cubesat Workshop
Link Budget Analysis
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Platform: On-board Data Handling
4th IAA Conference on University Satellite Missions and Cubesat Workshop
choice criteria are: Resilience against the harsh space environment,
High processing power,
Power consumption and memory storage.
Flight heritage to ensure reliability,
Hardware or software redundancy to minimize single point of failures,
Price,
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Platform: On-board Energy
4th IAA Conference on University Satellite Missions and Cubesat Workshop
Solar panels:
• Body mounted /deployed
• Simple/ double / triple junctions
Batteries: Low DOD (Depth of Discharge) is recommended for
better resistance to radiations, better temperature coefficients, higher levels of delivered power, and hence higher efficiency.
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Platform: On-board Energy
4th IAA Conference on University Satellite Missions and Cubesat Workshop
Power Budget Analysis
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Production and Qualification Processes
Activities:
• Implementation approach : Fabricate/ procure/ reuse hardware and
code software.
• Prototype/ protoflight verification, validation and integration
• Run qualification tests such as : vibration, static, mechanisms,
thermal vacuum tests
• Run final functional tests
• Packaging
4th IAA Conference on University Satellite Missions and Cubesat Workshop
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Management Processes
4th IAA Conference on University Satellite Missions and Cubesat Workshop
Project Management
Project organization and planning
* Definition of stackeholders
* Definition of project life cycle and milestones
Mission architecture definition
* Definition of the payloads,
* Identification of potential launch vehicles, constraints and proposed services,
* Identification of the space segment configuration
* Identification of the ground segment locations
* Definition of communication link configuration, frequency bands and transmission mode and frequency allocation license
* Product Tree and Work breakdown structures
Cost and schedule management
Documentation management
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Keep It Simple Stupid
Keep track of interfaces
Update risk analysis
Team work and respect of management plans and
ConOps
Conclusion & Futur Perspectives
4th IAA Conference on University Satellite Missions and Cubesat Workshop
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Thank youfor your attention
4th IAA Conference on University Satellite
Missions and Cubesat WorkshopIAA-AAS-CU-17-06-02