Sensor-Based Robust Incremental Three-Dimensional Guidance Law with Terminal Angle Constraint

In this work, a robust incremental three-dimensional (3D) guidance law is proposed considering terminal angle constraint against maneuvering targets. As stepping stone, the line-of-sight (LOS) tracking error dynamics employed for 3D design. A sliding variable constructed such that its first-order derivative excludes relative range in perturbation, which avoids unboundedness of system perturbation induced by target maneuvers near collision. time-varying version designed to accelerate convergence LOS errors and avoid large initial variables. Then, two laws are derived as benchmark via nonlinear dynamic inversion (NDI)-based mode control (NDI-SMC) NDI-based (NDI-TVSMC), respectively. To further improve robustness with reduced sensor-based (INDI) used design INDI-SMC-based INDI-TVSMC-based laws. The exploit angular acceleration command output at latest step, result smaller gains reject than NDI Numerical simulations various cases comparison studies conducted verify effectiveness method.