Robust Fuel-Optimal Landing Guidance for Hazardous Terrain using Multiple Sliding Surfaces

Belangrijkste concepten

Developing a novel MSS-OTALG guidance law for precision soft landing in hazardous terrain with low fuel consumption and robustness.

Samenvatting

The article introduces the MSS-OTALG guidance law, enhancing precision soft landings while avoiding hazardous terrain. It addresses the lack of robustness in existing methods by incorporating multiple sliding surfaces (MSS) to improve accuracy. Extensive simulations demonstrate its effectiveness in terrain avoidance, low fuel consumption, and soft landing accuracy.

1. Introduction

   • Importance of precision soft landings in spacecraft missions.
   • Existing literature on fuel optimality and precision landing techniques.

2. Optimal Terrain Avoidance Landing Guidance (OTALG)

   • Developed to avoid terrain with near-fuel-optimal performance but lacks robustness.
   • Introduction of MSS-OTALG to enhance precision soft landing accuracy under disturbances.

3. Multiple Sliding Surfaces Design

   • Surface 1: Monitors positional error relative to target landing site.
   • Surface 2: Ensures stability during deviations from sliding mode control path.

4. Robustness Analysis

   • Practical fixed-time stability established for MSS-OTALG under atmospheric perturbations.

5. Simulation Results

   • Comparative study against augmented OSG and OTALG under zero and non-zero atmospheric perturbations.
   • Monte Carlo simulations validate MSS-OTALG's superior performance in precision soft landings and terrain avoidance with near-optimal fuel consumption.

6. Conclusion

   • Development of MSS-OTALG for robust, fuel-optimal, and precise spacecraft landings in hazardous terrains.

Statistieken

Very few papers address both precision soft landing and terrain avoidance simultaneously.
Thruster actuation latency is incorporated as first-order delays with τ = 0.0556s.
Atmospheric perturbation model: ap(t) = 0.3ac sin(πt/3).

Citaten

"In any spacecraft landing mission, precision soft landing in a fuel-efficient way while also avoiding nearby hazardous terrain is of utmost importance."
"Extensive numerical simulations showcase the performance of MSS-OTALG in terms of terrain avoidance, low fuel consumption, and accuracy of precision soft landing."

Belangrijkste Inzichten Gedestilleerd Uit

Robust Fuel-Optimal Landing Guidance for Hazardous Terrain using Multiple Sliding Surfaces

by Sheikh Zeesh... om arxiv.org 03-20-2024

https://arxiv.org/pdf/2403.12584.pdf

Diepere vragen

How can the MSS-OTALG guidance law be adapted for different planetary environments

The MSS-OTALG guidance law can be adapted for different planetary environments by adjusting the parameters and constraints based on the specific characteristics of each planet. For example, the local gravity, atmospheric conditions, terrain features, and thrust capabilities may vary from one planet to another. By modifying the sliding surfaces and sliding parameter values in the guidance law, it can be tailored to suit the requirements of landing missions on Mars, Venus, or other celestial bodies. Additionally, incorporating data from planetary surveys and missions can help refine the terrain avoidance strategies within the MSS-OTALG framework for optimal performance in diverse environments.

What are the potential limitations or drawbacks of relying heavily on sliding mode control systems like MSS

While sliding mode control systems like MSS offer robustness against disturbances and uncertainties in spacecraft landing scenarios, they also have potential limitations. One drawback is chattering - rapid switching between control modes that can lead to high-frequency oscillations in control signals. This chattering phenomenon can cause wear and tear on mechanical components due to frequent changes in acceleration commands. Additionally, designing multiple sliding surfaces requires careful tuning of parameters which may be complex and time-consuming. Moreover, reliance solely on sliding mode control without considering other control techniques could limit adaptability to unforeseen challenges during a mission.

How might advancements in propulsion technology impact the design and efficiency of future spacecraft landing systems

Advancements in propulsion technology could significantly impact the design and efficiency of future spacecraft landing systems utilizing MSS-OTALG. Improved thrust vectoring capabilities or higher specific impulse engines could enhance maneuverability during descent stages leading to more precise soft landings with reduced fuel consumption. Furthermore, advancements such as electric propulsion systems or variable thrust engines could provide greater flexibility in controlling trajectories while optimizing fuel usage for extended space missions or challenging terrains. Integration of autonomous navigation algorithms with advanced propulsion technologies could further enhance overall system performance by enabling real-time adjustments based on environmental conditions during descent phases.