Embed Size (px)
Citation preview
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 1
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 2
Presented by:
Darran Siu (2250276)
Ching-Yi Chen (2272048)
Supervisor:
Dr. Keith Wiley
Assessor:
Dr. Jinhong Yuan
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 3
Overview of this presentation
• Introduction to the BLUEsat Project
• What are the objectives of this thesis project
• Overview of testing and integration of the Radio Systems on this Microsatellite
• Scope and Progress Report to date
• Followed by questions from the audience…
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 4
Basic Low Earth Orbit UNSW Experimental Satellite
• Based on the AMSAT-NA microsatellite design• Mass: Less than 15 Kg
• Size: 240 x 240 x 240mm (min)
BLUEsat Project
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 5
BLUEsat Structure
• Body mounted solar panels
• Modular stack tray design• Spring loaded
deployment mechanism• Passive magnetic
stabilization
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 6
Flight Computer
Communications Systems
Imaging system
Lexan Experiment
Power Management
GPS
BLUEsat Subsystems
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 7
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 8
• The reason for the chosen radio frequency range
• Amateur Radio Satellite Frequencies• J mode — 145MHz uplink and 435MHz downlink• Why?
– To avoid the pager interference that operates on 145MHz
– To avoid Asian Pirates (eg Taxi Companies)
The Radio System
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 9
FM Transmitter & FM Receiver
Receiver
• Model: Hamtronics R100
• Frequency: Receives at 145MHz
• Data rate: 9.6Kbps
• Main function—– Amplification– Selection and filtering– Frequency Demodulation– Frequency conversion
Transmitter
• Model: Hamtronics TA451
• Frequency: Transmits at 435MHz
• Data rate: 9.6Kbps
• Main function—– Frequency Modulation– Frequency conversion– Amplification
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 10
Problems with Student Engineering Projects
• Volunteer based Organisation • Limited Resources• Lack of Experience• Lack of interfacing between sub-projects• They have influence over our Thesis Project
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 11
• Validate/Establish of Requirements and Specifications of the Radio System
• To test the functionality of the radio system and its components.
• To integrate the system onto the microsatellite.
• Ensure the Radio System will survive launch and space environments
• To gain deeper knowledge of the satellite development and operation in space.
Thesis Objectives
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 12
RX145 MHz
TX435 MHz
TX145 MHz
RX435 MHz
Earth Equipment (the ground station) and Testing units
BLUEsat Interfaces
BLUEsat Power System
Antenna System
Antenna System
Antenna System
Antenna System
RF 435 MHz OutRF 145 MHz In
Audio In 2V P-P
Unregulated battery voltage 13.6V -> flat battery ~ 10V
Variable Controllable Voltage 13.6V – 9.1V
FM 145MHz
any polarisation
FM 435 MHz
RHCP polarization
THESIS SCOPE
Modem/TNC
(Optional)
BLUEsat FlightComputer System
Audio Out 2V P-P
Serial
Comm Link
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 13
Systems Engineering Approach
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 14
Particular Engineering Challenges with BLUEsat
• Complex Space Systems Engineering
• Lack of Knowledge• Expensive operation• Limited Resources• Lack of Experience
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 15
Requirements• Communicate to
Groundstations• Transmit and Receive at
9600 bits per second• Allow Amateur Radio
Operation• Transmit and Receive on
Amateur Radio Bands• Comply with ITU and
ACA Regulations• Fully operate under
space conditions
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 16
Specification
• Receiver receives at the frequency of 145MHz
• Transmitter transmits at the frequency of 435MHz
• The input DC voltage is between 9.1 to 13.6 volts.
• The impedance of the antenna is 50 ohms.
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 17
Testing Plan
• Functionality– Basic On/Off Test
• Boundary Conditions– Physical limit of each component
• Environmental– Temperature– EMI– Radiation
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 18
Functionality• Testing basic operation of
each component.
• Testing the basic functionality to see if it meets the spec values
• Pass or Fail criteria
• Static Free environment
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 19
Boundary conditions
• Power– DC input power– Heat Generated– RF performance
• Frequency– Frequency drift effected by
the temperature– Doppler shift
• The maximum physical limits (and the range) of each component/system that it can be exposed to before breaking down
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 20
Environmental tests• Temperature Drifts• Vacuum• Electromagnetic
Interference (eg Space Radar)
• Cosmic Radiation• Heat
Generated/Absorbed
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 21
Integration• Building the interfaces between
– The Power system– Antennas– The receiver and the transmitter– Flight Computer/TNC
• Integrate the radio system onto the satellite• Co-operate with other sub systems on the
satellite • Do the qualification and acceptance tests
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 22
Qualification Test• Use of Lab View software – Data Logger• Test the radio system with the whole satellite• Test the radio system against the boundary
conditions
Acceptance Test
• Pre-Launch functionality test• Carry over the modifications
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 23
• Considerable amount of heat generated• Size restrictions• Power Restrictions• Bandwidth Restrictions
Current problems encountered
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 24
• Change the satellite• Modify the components• Downgrade our functionality• Strengthen Components• Use Space Grade Componentry• Ensure ESD Free Environment• Meticulous documentation and testing results
Possible solutions
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 25
Phase 1: Defining the thesis scope
Progress report & work plan
Phase 2: Literature review
Phase 3: Validating & Establishing requirements
Phase 4: Boundary Conditions Analysis
Phase 5: Developing & Designing Test Plans
Previous work from BLUEsat
Interfaces fromBLUEsat Sub-systems
Space Environment and knowledge
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 26
Progress report & work plan
Phase 6: Preliminary Component Testing
Phase 7: Space Environment Modification/ Hardening
Phase 8: Integration & Qualification Testing
Phase 9: Acceptance Testing
Pass/Fail
Pass/Fail
Pass/Fail
Pass
Pass
Pass
Fail
Fail
Fail
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 27
Then we can launch…
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 28
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 29
We would like to thank all our generous sponsorsand supporters for helping make this possible.
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 30
Darran Siu and Ching-Yi ChenTesting and Integration of the Radio System
on a MicrosatelliteSlide 31
