Space Integrated GPS/INS

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Space Integrated GPS/INS (SIGI) is a strapdown Inertial Navigation Unit (INU) developed and built by Honeywell International to control and stabilize spacecraft during missions. It has integrated global positioning/inertial navigation to provide three navigation solutions: Pure inertial, GPS-only and blended GPS/INS. SIGI have been employed on the International Space Station,[1] the Japanese H-II Transfer Vehicle (HTV)[2] the Boeing X-37[3] and X-40.

SIGI is also proposed as the primary navigation system for Orion, which is scheduled to replace the Space Shuttle.[needs update]

See also[edit]


  1. ^ "Lessons Leamed from Two Years of On-Orbit Global Positioning System Experience on International Space Station" (PDF). PDF. NASA Johnson Space Center. Retrieved 2006-09-27. 
  2. ^ "H-IIA Transfer Vehicle". Web Site. Japan Aerospace Exploration Agency (JAXA). Archived from the original on September 28, 2006. Retrieved 2006-10-01. 
  3. ^ "Independent Assessment of X-37 Safety & Mission Assurance Processes and Design Features" (PDF). PDF. NASA Headquarters Office of Safety & Mission Assurance. Retrieved 2006-09-27. 

External links[edit]