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<p>Differential drag is a propellant-less technique for LEO constellation phasing. Conventional phasing methods with differential drag, which rely on maximum-minimum drag switching maneuvers, can induce power instability, leading to interruptions in phasing due to Battery Charge Mode entries. This paper presents a Pitch-Roll Attitude Strategy designed to mitigate this issue by simultaneously enhancing both aerodynamic drag and power generation. The strategy determines the proper attitude by maximizing an objective function based on the real-time Sun vector. The performance of this approach was evaluated via simulations using two representative LEO constellation models. In the simulated scenarios, the proposed strategy maintained the battery State of Charge (SoC) above a 70% threshold, avoiding frequent Battery Charge Mode entries observed with the conventional method. This continuous operation reduced both phasing time and total altitude loss, demonstrating the strategy’s potential to improve mission efficiency and extend the operational lifetime of LEO constellations.</p>

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A Pitch-Roll Attitude Strategy for LEO Constellation Phasing with Differential Drag Under Power Constraints

  • 期刊论文

  • 发表日期：

    2025年10月24日

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  • Sihyun Kim,
  • Hyosang Yoon

摘要

Differential drag is a propellant-less technique for LEO constellation phasing. Conventional phasing methods with differential drag, which rely on maximum-minimum drag switching maneuvers, can induce power instability, leading to interruptions in phasing due to Battery Charge Mode entries. This paper presents a Pitch-Roll Attitude Strategy designed to mitigate this issue by simultaneously enhancing both aerodynamic drag and power generation. The strategy determines the proper attitude by maximizing an objective function based on the real-time Sun vector. The performance of this approach was evaluated via simulations using two representative LEO constellation models. In the simulated scenarios, the proposed strategy maintained the battery State of Charge (SoC) above a 70% threshold, avoiding frequent Battery Charge Mode entries observed with the conventional method. This continuous operation reduced both phasing time and total altitude loss, demonstrating the strategy’s potential to improve mission efficiency and extend the operational lifetime of LEO constellations.