Generation of launch windows for high-accuracy lunar trajectories

Yim, Shing-Yik; Gong, Shengping; Baoyin, Hexi

doi:10.1016/j.asr.2015.05.006

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…This paper exploits this capacity by incorporating launch window into ascent trajectories. The launch window, which plays an important role in space missions, means the allowed deviation from the ideal launch time . There are many literatures that study launch window.…”

Section: Introductionmentioning

confidence: 99%

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Ascent trajectory optimization for air‐breathing vehicles in consideration of launch window

Hong-yu

Wang

Cui

2019

Optim Control Appl Methods

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Summary This paper studies the optimal ascent trajectory for a one‐stage‐to‐orbit, air‐breathing vehicle. This kind of vehicle allows endoatmospheric lateral maneuver and thus can extend the launch window. To obtain the optimal orbit‐insertion trajectory in consideration of launch time, a novel optimization model is proposed by designing longitudinal and lateral profiles separately. The longitudinal flight aims to meet the orbital shape that contains the eccentricity and the angular momentum, which are transformed to boundary constrains in altitude, path angle, and velocity. For lateral motion, the orbit inclination and right ascension of ascending node are designed to vary simultaneously as the range. By designing an altitude profile, the terminal altitude and path angle are naturally met and removed from the constraints and accurate orbit insertion is realized by searching the total range and the initial azimuth. Then, the original problem is converted to a parameter optimization problem and solved by a hybrid optimization algorithm, in which the solution is first searched by a particle swarm optimization method and then refined by a modified golden section method. Simulation tests the proposed method with various scenarios. Compared to traditional launch vehicles, a launch window over 1.5 hours is derived without consuming the propellant in the upper stage.

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Section: Introductionmentioning

confidence: 99%

“…The launch window, which plays an important role in space missions, means the allowed deviation from the ideal launch time. [23][24][25] There are many literatures that study launch window. For example, motivated by the program of Apollo, 26 Johnson 27 discussed the effect of launch time on free-return circumlunar trajectories.…”

mentioning

confidence: 99%