Impulse Direction Angle

Author: Tianjiang Shuo

Website: https://cislunarspace.cn

Definition

The angle between the impulse thrust direction and the perpendicular to the radial vector. In Lawden's optimal transfer theory, this angle together with impulse magnitude determines the post-maneuver orbital parameters. Optimal transfers require impulses at apses perpendicular to the radius (zero direction angle) to maximize thrust contribution to velocity.

Application Value

The Impulse Direction Angle plays a significant role in cislunar space mission design, analysis, and control. In orbital design, it can be leveraged for transfer trajectory optimization; in navigation and control, it improves mission execution precision and reliability; in system analysis, it facilitates deeper understanding of complex multi-body dynamical behavior, guiding mission planning and risk assessment.

References

  • Lawden, D. F. (1962). Impulsive Transfer between Elliptical Orbits. In Optimization Techniques, Ch. 11.
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Contributors: ouyangjiahong, Ou Yang Jiahong