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Project Bellerophon April 17, 2008 Avionics

Project Bellerophon April 17, 2008 Avionics. Overview. 1. Electronic Parts: Component Rating. 1 NASA Electronics Parts Assurance Group. 2. Telecom Analysis: Doppler Shift. Frequency Shift due to Doppler Effect. 3. Telecom Analysis: Data Rate. Change in Link Margin due to Data Rate.

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Project Bellerophon April 17, 2008 Avionics

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  1. Project BellerophonApril 17, 2008Avionics Avionics AAE 450 Spring 2008

  2. Overview Avionics AAE 450 Spring 2008 1

  3. Electronic Parts: Component Rating 1 NASA Electronics Parts Assurance Group Avionics AAE 450 Spring 2008 2

  4. Telecom Analysis: Doppler Shift Frequency Shift due to Doppler Effect Avionics AAE 450 Spring 2008 3

  5. Telecom Analysis: Data Rate Change in Link Margin due to Data Rate Avionics AAE 450 Spring 2008 4

  6. Telecom Analysis: Path Length Change in Link Margin due to Signal Path Length Avionics AAE 450 Spring 2008 5

  7. Telecom Design: Vehicle Link Budget Simplified Link Budget Minimum Margin: 3 dB Vehicle Margin: 39.2 dB Avionics AAE 450 Spring 2008 6

  8. Range Safety: Personnel • Range Safety Officer (RSO) • An individual who is responsible for the remote destruction and consequent flight termination of the launch vehicle should it be deemed a hazard. • RSO Responsibilities • Evaluate the launch vehicle design as well as oversee the manufacturing process. • Monitors the launch vehicle and environmental conditions prior to launch. • Monitors and tracks the launch vehicle during flight. • Hiring • Budget $1,700 per launch, assuming a 5 day period. Avionics AAE 450 Spring 2008 7

  9. Range Safety: Flight Corridor • Flight Corridor • An imaginary zone that exists in a space above the launch range. • Application • Implemented so that if the launch vehicle where to experience a failure during flight, the vehicle will fall to the ground in an uninhabited area. • Termination • The launch vehicle must be destroyed if it flies outside the predetermined flight corridor. Avionics AAE 450 Spring 2008 8

  10. Non-Space-Rated Sensors Avionics AAE 450 Spring 2008 9

  11. Space-Rated Sensors Avionics AAE 450 Spring 2008 10

  12. Sensor Reliability Analysis: Thermal This table details the reasons for differences in cost. Avionics AAE 450 Spring 2008 11

  13. Power Supply: Power Budget 200g Payload Case, Silver Zinc Battery, Balloon Launch Avionics AAE 450 Spring 2008 12

  14. Power Supply: Battery Selection Avionics AAE 450 Spring 2008 13

  15. Power Supply: AgZn Battery AgZn Benefits • Can charge 4 to 6 times in case of scrub • Capable of controlling gimballing, ignition, and range safety subsystems 1http://www.eaglepicher.com/ Avionics AAE 450 Spring 2008 14

  16. Power Supply: Batteries Estimate Cost: < $10,000 Weight: 2.3-4.5 kg Avionics AAE 450 Spring 2008 15

  17. Installation Cost Primary Contractor: Aircraft Electrician 1 Salary data from www.salary.com Avionics AAE 450 Spring 2008 16

  18. Telecom: Failure Analysis Reliability Factors For a low complexity system with redundancy1: Part ClassReliability Class B: 98.75% Class S: 99.87% Assumptions - Simple system - Low radiation dose - Reliability based on a five year mission plan 1 Wertz, 404. Avionics AAE 450 Spring 2008 17

  19. Mass Budget • First Stage: 6.024 kg total (safety factor=1.2) -wiring: 2kg -sensors 1.02kg -battery 2kg • Second Stage: 30.2664 kg total (safety factor=1.2) -Telecom: 10 kg -CPU: 0.85 kg -Sensors: 1.02 kg -Range Safety: 9.23 kg -Wiring: 2 kg -IMU: 0.122 kg -Battery: 2kg • Third Stage: 1.2 kg total (safety factor=1.2) -Wiring: 1 kg Avionics AAE 450 Spring 2008 18

  20. Payload: Launching Options • Launch lock (US Patent 6508437) • Motorized release • Explosive Bolt/Spring sequence1 • Explosive/Slingshot Sequence 1(Professor Filmer), (International Reference Guide to Space Launch Systems pg 296) Avionics AAE 450 Spring 2008 19

  21. Signal Projection: Assumptions • Assumptions Made • The Earth is spherical in shape. • The area where the signal intercepts the Earth is circular. • Neglect any antenna mounting errors or design issues. • Neglect any atmospheric anomalies which may refract the signal. • The signal propagation from a cluster of directional antennas can be estimated using a omnidirectional antenna. • The signal propagation from an omnidirectional antenna is spherical in shape. Avionics AAE 450 Spring 2008 20

  22. Launch Vehicle Tracking Example Case: Small Payload Launch Vehicle 1Professor Filmer, Purdue University School of Aeronautics and Astronautics Avionics AAE 450 Spring 2008 21

  23. Avionics: Cost Budget Avionics AAE 450 Spring 2008 22

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