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Testing and integration of Radio Systems on a Microsatellite

Testing and integration of Radio Systems on a Microsatellite. ULSSD, BLUEsat Project. 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 Microsatelltite

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Testing and integration of Radio Systems on a Microsatellite

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  1. Testing and integration of Radio Systems on a Microsatellite

  2. ULSSD, BLUEsat Project

  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 Microsatelltite • Scope and Progress Report to date • Followed by questions from the audience…

  4. BLUEsat Project • 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)

  5. BLUEsat Structure • Body mounted solar panels • Modular stack tray design • Spring loaded deployment mechanism • Passive magnetic stabilization

  6. BLUEsat Subsystems Imaging system Flight Computer Communications Systems Power Management GPS Lexan Experiment

  7. Problems with Student Engineering Projects • Volunteer based Organisation • Limited Resources • Lack of interfacing between sub-projects • Lack of Experience

  8. Particular Engineering Challenges with BLUEsat – our customer • Complex Space Systems Engineering • Lack of Knowledge and Experience • Limited Resources • Expensive operation • Lack of Experience

  9. Thesis Objectives: • Review 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. • To gain deeper knowledge of the satellite development and operation in space.

  10. Systems Engineering Approach

  11. Requirements • To: • Communicate to Groundstations • Transmit and Receive at 9600 bits per second • Transmit and Receive on Amateur Radio Bands • Comply with ITU and ACA Regulations • Fully operate under space conditions

  12. Specification • Receiver receives at the frequency of 435Hz • Transmitter transmits at the frequency of 145Hz • The input DC voltage is between 9.1 to 13.6 volts. • The impedance of the antenna is 50 ohms.

  13. Testing Plan • Functionality • Basic On/Off Test • Boundary Conditions • Physical limit of each component • Environmental • Temperature • EMI • Radiation

  14. BLUEsat Power System BLUEsat Interfaces Unregulated battery voltage 13.6V -> flat battery ~ 10V Variable Controllable Voltage 13.6V – 9.1V RX 145 MHz TX 435 MHz Audio Out 2V P-P Audio In 2V P-P Thesis Scope Antenna System Antenna System RF 145 MHz In RF 435 MHz Out FM 145MHz any polarisation FM 435 MHz RHCP polarisation Antenna System Antenna System Earth Equipment and Testing units TX 145 MHz RX 435 MHz

  15. Functionality • Testing basic operation of each component. • Testing the basic functionality to see if it meets the spec values • Pass or Fail criteria • ESD free environment

  16. Boundary condition • Power • DC input power • RF performance • Frequency • Frequency drift effected by the temperature • Doppler shift

  17. Environmental tests • Temperature • EMI • Radiation

  18. Electrical systems: • Radios from Hamtronics • Modem chip onboard FC • EDAC chip onboard FC • SRAM (32MB) • Batteries selected • Solar Modules well into development • Hybrid design based around SA1100 CPU (Digital) • Telemetry collected via I2C • Pacsat server software running under a Linux based OS

  19. We would like to thank all our generous sponsors and supporters for helping make this possible.

  20. ? Questions ? ?

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