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Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 1.

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Presentation on theme: "Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 1."— Presentation transcript:

1 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 1

2 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 2 Presented by: Darran Siu ( ) Ching-Yi Chen ( ) Supervisor: Dr. Keith Wiley Assessor: Dr. Jinhong Yuan

3 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 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 …

4 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 4 B asic L ow Earth Orbit U NSW E xperimental Sat ellite Based on the AMSAT-NA microsatellite design Mass:Less than 15 Kg Size:240 x 240 x 240mm (min) BLUEsat Project

5 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 5 BLUEsat Structure Body mounted solar panels Modular stack tray design Spring loaded deployment mechanism Passive magnetic stabilization

6 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 6 Flight Computer Communications Systems Imaging system Lexan Experiment Power Management GPS BLUEsat Subsystems

7 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 7

8 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 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

9 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 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

10 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 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

11 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 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

12 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 12 RX 145 MHz TX 435 MHz TX 145 MHz RX 435 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 Flight Computer System Audio Out 2V P-P Serial Comm Link

13 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 13 Systems Engineering Approach

14 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 14 Particular Engineering Challenges with BLUEsat Complex Space Systems Engineering Lack of Knowledge Expensive operation Limited Resources Lack of Experience

15 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 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

16 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 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.

17 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 17 Testing Plan Functionality –Basic On/Off Test Boundary Conditions –Physical limit of each component Environmental –Temperature –EMI –Radiation

18 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 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

19 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 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

20 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 20 Environmental tests Temperature Drifts Vacuum Electromagnetic Interference (eg Space Radar) Cosmic Radiation Heat Generated/Absorbed

21 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 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

22 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 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

23 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 23 Considerable amount of heat generated Size restrictions Power Restrictions Bandwidth Restrictions Current problems encountered

24 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 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

25 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 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 from BLUEsat Sub-systems Space Environment and knowledge

26 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 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

27 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 27 Then we can launch…

28 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 28

29 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 29 We would like to thank all our generous sponsors and supporters for helping make this possible.

30 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 30

31 Darran Siu and Ching-Yi Chen Testing and Integration of the Radio System on a Microsatellite Slide 31


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