Optimal ZEM/ZEV Feedback Guidance for Mars Powered Descent Phase
首发时间:2013-11-14
Abstract:This paper applies the zero-effort-miss (ZEM) and zero-effort-velocity (ZEV) optimal feedback guidance algorithm to the Mars powered descent problem. Detailed descriptions have been given to this algorithm. The main advantage of this optimal guidance law is that it can not only meet the final position and velocity requirement at the same time, but also be fuel-optimal. For future Mars landing mission, the thrust-limited engine is most likely to be used. The optimal final time will be studied and determined by simulation which can minimize the fuel usage while ensuring precision landing and no-subsurface constraints. And the optimal sliding-mode guidance(OSG) which is a modification of optimal guidance law(OGL) will also be discussed and compared with the pure optimal guidance law for the Mars powered descent phase. Monte Carlos are run to test the robustness and reliability of the two algorithms which show that the two algorithms can achieve precise landing perfectly and have nearly identical performance in robustness and reliability.
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火星动力下降段的最优ZEM/ZEV反馈制导
摘要:这篇文章将最优ZEM/ZEV反馈制导算法应用到了火星动力下降段问题并详细介绍了该算法。 这种基于ZEM/ZEV的最优制导算法的主要优点在于它不仅能同时满足最终位置和最终速度的要求, 还能实现燃料最优化。 对于将来的火星着陆任务,最有可能使用限制推力的引擎。 本文通过仿真研究了不同终端时间对该制导算法性能的影响并且得到了能使燃料消耗最少并同时满足精确着陆和高于火星表面飞行限制的最优终端时间。 此外还讨论了基于最优制导律(OGL)的最优滑模制导算法(OSG)并且将其与最优制导律相比较。 最后通过蒙特卡洛仿真来测试这两种算法的鲁棒性和可靠性。 仿真结果显示这两种算法能很好地实现精确着陆并且有几乎相同的鲁棒性和可靠性。
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