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Table 2 Abbreviations

From: Energy efficiency performance in RIS-based integrated satellite–aerial–terrestrial relay networks with deep reinforcement learning

Parameter

Specific meanings

\({\Omega _B}\)

UAV rotor angular velocity

\({r _R}\)

Radius of the UAV rotor

\({\rho _a}\)

Density of air

\({s _r}\)

Solidity of UAV rotor

\({A _r}\)

Disk area of UAV rotor

\({v _i}\)

Propulsion speed in moving forward

\({d _f}\)

Fuselage drag ratio

V

Current speed