Mars Entry Guidance Based on Predictor-Corrector Algorithm
首发时间:2013-10-18
Abstract:This paper addresses the development and evaluation of the numerical predictor-corrector algorithm for the Mars entry guidance.The requirement of future Mars missions is to enable pinpoint and high elevation Mars landing.There are two main entry guidance algorithms: guidance using a reference trajectory and guidance using predictor-corrector.Guidance algorithm that tracks the reference trajectory during entry, has some degree of model-independence and does not require fast on-board computation, but it is sensitive to initial conditions.However, the predictor-corrector algorithm can be less sensitive to initial dispersions, but needs fast on-board computation.Detailed descriptions of predictor-corrector algorithm, lateral control logic and heading alignment are given and an improved predictor-corrector algorithm is provided to shorten the on-board computational time. Simulation results show that this entry guidance algorithm demonstrates reliable and robust performance in situations with high uncertainties.
keywords: entry guidance, predictor-corrector, on-board computation, lateral control, heading alignment.
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基于预测校正算法的火星进入段制导
摘要:这篇文章介绍了基于预测校正算法的火星进入段制导方法的发展并对其进行评估。未来火星任务的要求是能确保精确和高海拔的火星表面着陆。现在主要有两种进入段制导算法:基于标称轨迹的制导和基于预测校正的制导。跟踪标称轨迹的制导算法相对不依赖于模型,并且不要求很高的在线计算能力。但是它对初始条件具有较高的敏感性。而预测校正算法对于初始扰动的敏感性较低,但是却要求较高的在线计算能力。这篇文章对预测校正,横向控制和航向调整算法给出了详细介绍,同时提出了一种改进的预测校正算法来减少在线计算量。仿真结果表明这种进入段制导算法在有很高不确定性的情况下仍然能体现出可靠性和鲁棒性。
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