Eun-Jung Song/Woong-Rae Roh/Jeong-Yong Kim/Jun-Seok Oh/Jung-Ju Park/Gwang-Rae Cho
International Journal of Aeronautical and Space Sicences, vol. 11, no. 3, pp.184-192, 2010

Abstract : In this paper, an initial fine alignment algorithm, which is developed for the strap-down inertial navigation systems of satellite launch vehicles, is considered. For fast and accurate alignment, a simple closed-loop estimation algorithm using a proportional-integral controller is introduced. Through computer simulation for the sway condition in the launch pad, it is shown that a simple filter structure can guarantee fast computational speed that is adequate for real-time implementation as well as the required alignment accuracy and robustness. In addition, its implementation results are presented for the Naro-1 flight test.

Keyword : Space launch vehicle, Inertial navigation system, Initial alignment