Study on the Influence of Disturbance Rejection Rate on the Performance of Roll-Pitch Semi-Strapdown Guidance System

Abstract

Based on the actual engineering development experience, the working principle of the roll-pitch semi-strapdown guidance system is analyzed. Focused on the influence of disturbance rejection on the miss distance of the guidance loop, the roll-pitch semi-strapdown guidance system model is designed to produce the disturbance rejection parasitic loops, so as to study the influence of disturbance rejection on guidance commands and the influence of distur-bance torque on the stability of the guidance system. When the roll frame takes different angles, the typical disturbance is used as the system error input, and the influence of disturbance rejection on the miss distance of the semi-strapdown guidance system based on proportional navigation law is analyzed by simulation. The simulation results indicate that the stability of the system is reduced under the damping torque, larger navigation ratio and head-on interception mode. On the same disturbance rejection condition, the influence of different roll frame angles on the miss distance varies, but the overall negative disturbance rejection rate makes the system stability higher.

Keywords

• |guidance law|roll-pitch seeker|stability|miss distance|disturbance rejection|frame angle