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METEOR Guidance System

METEOR Guidance System. P07106 Nov 2006 – May 2007 Project Review. Project Goals. Control system for rocket flight Actuation system for rocket maneuvering Flight ready electrical hardware Software implementation Flight simulation. Dave Control system Simulation Ryan Software

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METEOR Guidance System

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  1. METEOR Guidance System P07106 Nov 2006 – May 2007 Project Review

  2. Project Goals • Control system for rocket flight • Actuation system for rocket maneuvering • Flight ready electrical hardware • Software implementation • Flight simulation

  3. Dave Control system Simulation Ryan Software Horizon sensor electrical Mark Flight Computer Electrical hardware Ben Actuations system Mechanical assembly Joe Horizon sensor radiometry Camera Lens Assembly Actuator testing systems Project management People

  4. Control System • Utilize sensor inputs • Determine response • Generate commands for actuators

  5. Complementary Filter

  6. PID Controller

  7. Sensors • Inertial Measurements Unit • Off the shelf IMU • 3 axis acceleration • 3 axis rotation rate • Digital output 150 Hz • Horizon Sensor • Custom made • CMOS imaging sensor • Wide angle lens • Band Pass filtered

  8. IMU • Internal ADC with temperature compensation • RS-422 Digital Output • 5G Accelerometers on all three axis • 300 Deg/s Rate Gyros on all three axis • 35G Accelerometers on two axis • Non Idealities -Acceleration dependant Gyro bias

  9. Horizon Sensor

  10. Software

  11. Image processing • Equidistant point algorithm • -Removes curvature of earth • Simple orientation extraction • Pixel luminosity thresholding • -Easy to implement • -Uses constant threshold value • -Can use a variable threshold lookup table vs altitude

  12. Flight Computer • Custom design • TI 2808 DSP • 4 layer PCB • SMT construction

  13. Block Diagram

  14. Actuators • 4 Vernier jets • Powered by pressurized NOX • Gas generated from boiling liquid • Jets rotate on BB Rotary unions • Controlled by PWM servo actuators and push-pull linkages

  15. Nozzles • Converging-diverging design • Throat area matched for flow rate • Area ratio optimized for thrust • Custom tooling for fabrication • Thrust & flow tested

  16. Motion control • NOX feed line with rotary union • PWM controlled digital servo • Response measured experimentally

  17. Simulation • 2D simulations • Spec thruster output • Spec mass and burn time to other groups • Determine worst case trajectory • 3D simulations • Test control system • Test actuator response • Spec thrust axis tolerances

  18. 2D simulations

  19. 3D Simulations

  20. Conclusions • Micron CMOS sensors not performing as indicated in spec sheet • Horizon sensors n

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