Two-Level Targeter, TLT

Author: Tianjiang Shuo

Website: https://cislunarspace.cn

Definition

A differential-correction-based guidance computation tool introduced by Howell and Pernicka in 1987. It places impulsive maneuvers at the endpoints of each guidance arc and solves for feasible trajectories through two-level iteration (inner constraint satisfaction, outer target matching). A constrained variant was subsequently developed for Orion spacecraft autonomous Earth-return guidance.

Application Value

The 两级靶点器 concept is applied in cislunar space research, providing technical support or analytical methods for lunar exploration missions.

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References

  • Wang 等 - 2024 - Low-energy earth–moon transfer autonomous guidance considering high-fidelity orbital dynamics