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Avionics. Don’t leave home without us.

Justin M. Rhodes 02.21.2008 Avionics – Telecommunications Analysis Code Integration and Automation Webmaster Sample Design and Failure Analysis. Avionics. Don’t leave home without us. Telecom Design: Sample Case. Model: LG-CA-DA-DT

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Avionics. Don’t leave home without us.

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  1. Justin M. Rhodes02.21.2008Avionics – TelecommunicationsAnalysis Code Integration and AutomationWebmasterSample Design and Failure Analysis AAE 450 Spring 2008 Avionics. Don’t leave home without us.

  2. Telecom Design: Sample Case Model: LG-CA-DA-DT • Power Distribution: Wiring- 52.25 m of wiring runs- 1.88 kg mass- $ 200 material cost- $ 7,172 installation cost • Assumptions • Main avionics bay located in second stage • Payload communications system will be utilized Simplified Link Budget Analysis AAE 450 Spring 2008 1 Avionics

  3. Telecom: Failure Analysis Reliability Factors For a low complexity system with redundancy1: Part ClassReliability Class B: 0.9875 Class S: 0.9987 Assumptions - Simple system - Low radiation dose - Reliability based on a five year mission plan 1 Wertz, 404. AAE 450 Spring 2008 2 Avionics

  4. Telecom Sample: Doppler Shift Effect Frequency Shift at Vehicle Delta V for 401 MHz Frequency Calculating Doppler Shift • f = transmitted frequency • v = velocity at which the vehicle is travelling away from the ground station • c = speed of light • λ= wavelength of transmitted wave AAE 450 Spring 2008 3 Avionics

  5. Telecom Sample: Bit Rate Analysis Data Rate Analysis for 401 MHz Frequency AAE 450 Spring 2008 4 Avionics

  6. Telecom Sample: Path Length Analysis Path Length versus Final Link Margin for 401 MHz Frequency Note: Atmospheric conditions were not factored into this analysis. Signal path is determined by atmospheric conditions the signal travels through and will limit the maximum range to the target. AAE 450 Spring 2008 5 Avionics

  7. Telecom Sample: Power Distribution Cost Primary Contractor: Aircraft Electrician MIL-W-16878/4 Electrical Wiring 1 Salary data from www.salary.com 2 Cost from TexWire, http://www.texwire.us AAE 450 Spring 2008 6 Avionics

  8. References • Fortescue, Peter and John Stark. Spacecraft Systems Engineering, Wiley, New York, NY, 1995. • Wertz, James R. and Wiley J. Larson. Space Mission Analysis and Design, Microcosm Press, Torrence, CA, 1999. • http://www.salary.com • TexWire Wire & Cable. http://www.texwire.us AAE 450 Spring 2008 7 Avionics

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