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TCP/IP Communications over Iridium Satellite Modems

NASA Dryden. TCP/IP Communications over Iridium Satellite Modems. Nick Spera Faculty Mentor: Dr. Gary Gear NASA Mentor: Larry Freudinger. Saturday, April 19, 2008. Embry-Riddle Aeronautical University Electrical Engineering. Motivation. Long-range science missions

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TCP/IP Communications over Iridium Satellite Modems

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  1. NASA Dryden TCP/IP Communications over Iridium Satellite Modems Nick Spera Faculty Mentor: Dr. Gary Gear NASA Mentor: Larry Freudinger Saturday, April 19, 2008 Embry-Riddle Aeronautical University Electrical Engineering

  2. Motivation • Long-range science missions • Retrieve data from polar sensors • Artic ice flows, climate change, etc.

  3. Problem • Line-of-sight is not a possibility • No access to military satellites • Must work with Linux

  4. Solution • Iridium network works globally and is readily available • However, Iridium is limited to 2400bps • Multiple channels are aggregated to increase data rate - MultiLink

  5. Diagram Iridium Satellites Physical Physical Logical MultiLink Linux PC Linux PC Logical MultiLink Base Station Sensor Data

  6. MultiLink • Viable solution, readily available and cost-effective • Complications: • TEQL • Dropped links • TCP/IP issues unique to our environment • MPPP • Robustness of the configuration

  7. Success and Conclusion • After months of research and vigorous trial and error, a workable solution was still out of reach • Embry-Riddle students suggested an alternate approach using different software (MPPP instead of TEQL) • This shift in direction brought immediate results and allowed NASA to begin finalizing and polishing the system

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