Abstract. The relevance of the study stems from the growing need to enhance the accuracy and reliability of modern rocket systems, particularly in the context of reusable technologies. The subject of the research is the development of a modular architecture for onboard software for a rocket carrier control system. The aim is to create an adaptive system ensuring precise navigation and flight stability, accounting for aerodynamic disturbances and variable mass. Research methods include simulations in MATLAB/Simulink, integration of the STM32 microcontroller with GPS and IMU sensors, and control algorithms such as PID regulators and pseudospectral methods. Key results indicate a reduction in the mean circular error (CEP) from 30–40 m to 3–10 m, resilience to GPS failures (up to 5 s) with a deviation not exceeding 8 m, and a 15–20% accuracy improvement due to an innovative rudder deflection angle of ±7.5°. Conclusions highlight the approach’s potential for reusable systems, with suggestions for integrating machine learning and additional GPS modules to enhance reliability.

Keywords: on-board software, missile control system, modular architecture, PID regulators, trajectory, real-time monitoring, aerodynamic rudders.