METHOD FOR SITUATIONAL TERMINAL CONTROL OF DESCENT MODULE IN EARTH'S ATMOSPHERE ON RICOCHETING TRAJECTORY OF RETURN FROM MOON Russian patent published in 2021 - IPC B64G1/12 

FIELD: aircraft industry.

SUBSTANCE: invention relates to the control of the movement of the descent module (DM) in the Earth's atmosphere in the presence of disturbances of both the DM and the environment. The DM enters the atmosphere at a near-parabolic speed from the southern hemisphere along a trajectory with two (I, III) dives into the atmosphere, an extra-atmospheric (II) section, and lands (L) on the territory of the Russian Federation. The descent range (from V1 to P) is 5000...10000 km. This type of trajectory is very sensitive to control and disturbing influences. In the descent control algorithm, adaptation based on autonomous measurements of the apparent acceleration of the DM is carried out with separate identification of the actual aerodynamic quality of the DM and the density of the disturbed atmosphere, as well as the errors of the navigation altitude. This allows choosing the right control in the area of its maximum efficiency - near the rebound point.

EFFECT: guaranteed increase in the accuracy (up to 2.7 km) of bringing the DM to the landing point, limiting the duration of action and the maximum value (up to 6g) of the overload, as well as reducing the fuel consumption of the control engines.

1 cl, 4 dwg