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首页> 外文会议>International Conference on Computer Communication and Informatics >Guidance with Supersonic Retropropulsion for Mars Pinpoint Landing
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Guidance with Supersonic Retropropulsion for Mars Pinpoint Landing

机译：超音速反推进引导火星精确着陆

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Future human and robotic missions to Mars require the landing of heavier payloads with greater precision. The present entry, descent and landing (EDL) technology is that of the Viking mission with necessary modifications. But this will be challenged by the larger payload mass of the future missions. The high ballistic coefficient of such missions makes parachute deployment impractical. The spacecraft will reach the parachute deployment conditions only at a low altitude with insufficient time for the rest of the EDL events. Also the diameter of the parachute has to be increased and materials which can withstand the atmospheric conditions must be used. This will demand new qualification methods to test the performance of the parachutes. One of the technologies that can be used as an alternative is Supersonic Retropropulsion (SRP). SRP uses thrusters to decelerate the spacecraft to safe landing velocities. Two distinct guidance algorithms to be used in the supersonic regime are discussed in this paper: a minimum time optimal guidance and a polynomial guidance. The optimal thrust angle required to be maintained in the supersonic phase is obtained using calculus of variations. In the subsonic phase, the vehicle uses polynomial guidance to decelerate to safe landing velocities.
机译：未来的人类和机器人火星飞行任务需要更精确地着陆较重的有效载荷。目前的进入，下降和着陆（EDL）技术是维京飞行任务的技术，并进行了必要的修改。但这将受到未来任务更大的有效载荷质量的挑战。这种任务的高弹道系数使降落伞部署变得不切实际。航天器仅在低空且没有足够的时间处理其余的EDL事件时才能达到降落伞部署条件。另外，降落伞的直径必须增加，并且必须使用能够承受大气条件的材料。这将需要新的鉴定方法来测试降落伞的性能。可以替代使用的技术之一是超音速反推进（SRP）。 SRP使用推进器使航天器减速至安全的着陆速度。本文讨论了在超音速状态下使用的两种不同的制导算法：最小时间最优制导和多项式制导。使用变化演算可以获得在超音速阶段需要维持的最佳推力角。在亚音速阶段，车辆使用多项式制导，以减速至安全的着陆速度。

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