To solve the problem of disturbance rejection rate parasitic loop(DRRPL)in the platform image seeker,the coning motion stability of rolling missile is studied based on a new overload autopilot.First,the linear dynamic model of rolling missile is deduced and simplified.And then,based on a new three-loop autopilot with an acceleration feedback augmentation loop as the inner loop,the rolling missile guidance system model considering the DRRPL of image seeker is constructed,and the dy-namic stability conditions of the proportional navigation/new overload autopilot guidance system with DRRPL are deduced.Be-sides,the effects of DRRPL,rotational speed and total delay angle of steering gear on the dynamic stability region of rolling missile are analyzed.Simulations are carried out to demonstrate that roll effect,parasitic effect and control instruction delay are the main factors leading to the decrease of stability region of autopilot parameter.In addition,the design parameters of the guid-ance system should be far away from the stability boundary to improve the stability of coning motion.
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