Dynamic Target Method

Author: Tianjiang Says

Website: https://cislunarspace.cn

Definition

The dynamic target method is an improved orbit keeping strategy proposed in Chen Yuju's 2024 dissertation. Unlike the traditional targeting method that uses fixed control parameters, the dynamic target method employs the Differential Evolution (DE) algorithm to dynamically optimize control parameters at each control epoch, achieving lower fuel consumption for DRO orbit keeping.

Key Innovation

The dynamic target method improves upon the traditional targeting method by:

  1. Dynamic optimization: Instead of using fixed control parameters, the DE algorithm searches for the optimal parameters at each control epoch
  2. Global search: DE's population-based search avoids local optima that gradient-based methods may converge to
  3. Adaptive parameters: Control timing, direction, and magnitude are jointly optimized

Process

  1. Determine current orbit state through navigation
  2. Define the search space for control parameters (timing, direction, magnitude)
  3. Apply DE algorithm to find the parameter set that minimizes fuel consumption
  4. Execute the optimal maneuver
  5. Repeat at the next control cycle

Comparison with Traditional Targeting Method

FeatureTraditional TargetingDynamic Target
Parameter selectionFixed or locally optimizedGlobally optimized by DE
Search methodGradient-basedPopulation-based (DE)
Fuel consumptionModerateLower
Computational costLowerHigher
ConvergenceLocal optimum possibleGlobal optimum seeking

References

  • Chen Yuju. DRO Orbit Design and Control Research for Cislunar Space Situation Awareness[D]. 2024.