Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Method for Increasing the Degree of Controllability of a Descent Spacecraft HU YUJHUEJ, SELEZNEVA M.S., NEUSYPIN K.A. The problem of studying the degree of controllability of a spacecraft during descent in the atmosphere along reference trajectories is considered. To increase the fl ight effi ciency of a spacecraft, a criterion for the degree of controllability of the state variables of a non-stationary system, based on the minimum energy consumption, was used. A hierarchical method is proposed for estimating the degree of controllability of the descent of a spacecraft in the atmosphere along various nominal trajectories, with different initial conditions and control algorithms. Mathematical modeling and analysis of the controllability of a spacecraft are presented to identify sections of the trajectory with a greater degree of controllability. Keywords: descent spacecraft, control algorithm, criterion for the degree of controllability, linear non-stationary system, guidance along the reference trajectory DOI: 10.25791/pribor.2.2024.1477 Pp. 49-58.