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http://dx.doi.org/10.5139/JKSAS.2022.50.10.709

Performance Analysis of the Gamma Guidance Algorithm for Solid Rocket Kick Motors of Upper Stages of Space Launch Vehicles  

Song, Eun-Jung (Korea Aerospace Research Institute)
Cho, Sangbum (Korea Aerospace Research Institute)
Sun, Byung-Chan (Korea Aerospace Research Institute)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.50, no.10, 2022 , pp. 709-716 More about this Journal
Abstract
In this paper the Gamma guidance law, which was used for IUS (Inertial Upper Stage), is applied for solid-motor guidance of a upper stage of a satellite launch vehicle. The RCS (Reaction Control System), which activates after burnout of the upper stage, is employed for the convergence of the guidance algorithm and compensation of velocity errors induced by the solid motor. The algorithm is also simplified by replacing the time-consuming numerical integration process to predict final vehicle states with Keplerian trajectories. The performance of the algorithm is evaluated by conducting 3-DOF computer simulations for off-nominal flight conditions. The numerical results show that Gamma guidance can reduce the orbit injection accuracy in comparison with that obtained by applying open-loop commands.
Keywords
Space Launch Vehicle; Guidance Algorithm; Closed-Loop Guidance; Kick Motor; Gamma Guidance; 3-DOF Simulation;
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