Explicit Guidance Law

Author: Tianjiang Shuo

Website: https://cislunarspace.cn

Definition

A guidance method that computes control commands in real time from the spacecraft's current state using explicit functional expressions. Unlike nominal trajectory guidance, which requires pre-stored optimal trajectories, explicit guidance demands low on-board computation and offers good real-time performance suitable for on-board processors. In powered descent, analytical expressions for acceleration and thrust direction angles can be derived via the Hamiltonian and co-state variables.

Application Value

在航天器控制系统设计中，This方法可used for设计姿态控制律或制导律，achieves对航天器姿态和轨道的精确控制。在实际任务中，基于This方法的控制器能够提高姿态稳定性和轨迹跟踪精度。

Related Concepts

• 月球自由返回轨道（Lunar Free-Return Orbit, LFO）
• 约束转化非线性规划（Constraint Conversion to Nonlinear Programming）
• 全局搜索（Global Search）
• 姿态确定与控制系统（Attitude Determination and Control System）

References

• 赵弘骞等 - 2021 - 基于动态规划的月面定点着陆快速制导方法