Space Integrated GPS/INS (SIGI)

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 [cite web | title=Lessons Leamed from Two Years of On-Orbit Global Positioning System Experience on International Space Station | work= PDF | publisher= NASA Johnson Space Center | url=http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20060020237_2006014558.pdf | accessdate=2006-09-27] , the Japanese H-II Transfer Vehicle (HTV) [cite web | title=H-IIA Transfer Vehicle | work= Web Site | publisher= Japan Aerospace Exploration Agency (JAXA) | url=http://www.jaxa.jp/missions/projects/rockets/htv/backnumber_e.html | accessdate=2006-10-01] the Boeing X-37 [cite web | title=Independent Assessment of X-37 Safety & Mission Assurance Processes and Design Features | work= PDF | publisher= NASA Headquarters Office of Safety & Mission Assurance | url=http://pbma.nasa.gov/docs/public/pbma/casestudies/X37_Independent_Assessment_Report.pdf | accessdate=2006-09-27] and X-40.

SIGI is also proposed as the primary navigation system for the Orion (spacecraft), which is scheduled to replace the Space Shuttle.

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See also

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* [http://www.honeywell.com/sites/aero/Guidance-Navigation3_C387DE127-B58B-CF3A-8190-A3014322262F_HAE85EBB2-C112-B35D-5844-F634132360F4.htm SIGI - Honeywell Aerospace]
* [http://gps.csr.utexas.edu/SOAR/ Relative Navigation and Attitude Determination Near the International Space Station]
*Miniature Inertial Measurement Unit (MIMU)
*Air navigation
*Spherical trigonometry

Notes and references