|Absolute Stability Margins in Missile Guidance Loop
Jong-Ju Kim and Joon Lyou*
International Journal of Control, Automation, and Systems, vol. 6, no. 3, pp.460-466, 2008
Abstract : This paper deals with the stability analysis of a missile guidance loop employing an integrated proportional navigation guidance law. The missile guidance loop is formulated as a closed-loop control system consisting of a linear time-invariant feed-forward block and a time-varying feedback gain. Based on the circle criterion, we have defined the concept of absolute stability margins and obtained the gain and phase margins for the system assuming 1st order missile/autopilot dynamics. The correlation between the absolute stability margins and the margins derived from the frozen system analysis is also discussed.
Keyword : Absolute stability margins, frozen system analysis, integrated proportional navigation guidance, missile guidance loop.