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秦同, 朱圣英, 崔平远. 火星软着陆能量最优制导律转移能力分析[J]. 深空探测学报(中英文), 2015, 2(3): 218-223. DOI: 10.15982/j.issn.2095-7777.2015.03.005
引用本文: 秦同, 朱圣英, 崔平远. 火星软着陆能量最优制导律转移能力分析[J]. 深空探测学报(中英文), 2015, 2(3): 218-223. DOI: 10.15982/j.issn.2095-7777.2015.03.005
QIN Tong, ZHU Shengying, CUI Pingyuan. Divert Capability Analysis of the Energy Optimal Guidance Law for Mars Soft Landing[J]. Journal of Deep Space Exploration, 2015, 2(3): 218-223. DOI: 10.15982/j.issn.2095-7777.2015.03.005
Citation: QIN Tong, ZHU Shengying, CUI Pingyuan. Divert Capability Analysis of the Energy Optimal Guidance Law for Mars Soft Landing[J]. Journal of Deep Space Exploration, 2015, 2(3): 218-223. DOI: 10.15982/j.issn.2095-7777.2015.03.005

火星软着陆能量最优制导律转移能力分析

Divert Capability Analysis of the Energy Optimal Guidance Law for Mars Soft Landing

  • 摘要: 着陆器在动力下降段的转移能力是影响定点软着陆的重要因素。文章从转移能力的角度出发,研究火星软着陆动力下降段能量最优制导律,分析燃料质量系数、时间权重以及不同初始高度和速度对转移能力的影响。由于能量最优制导律不能保证满足路径约束,因此对于确定的着陆器初始状态,着陆器转移能力不仅与燃料质量系数有关,还受到制导律本身的制约。当转移距离超过一定的界限时,尽管燃料充足,着陆轨迹会进入地表以下,造成任务失败。时间权重是能量最优制导律的关键参数,既影响燃耗,也影响着陆轨迹的形状。实际工程任务中,为实现燃料的充分利用,需根据着陆器状态调整制导律中的时间权重。本文给出了最优时间权重的确定方法,实现了一定燃料质量系数下的最大转移能力。

     

    Abstract: This paper investigates the optimal energy guidance law in Mars soft landing descent phase and analyzes the influence of the propellant mass coefficient, time weight and various initial conditions on divert capability. For certain initial states, the divert capability has something to do with not only the fuel but also the nature of the guidance law. In a real engineering mission, to make the best use of fuel, the time weight should be adjusted according to the Mars lander states. The optimal time weight is determined and the divert capability is maximized with a certain propellant mass coefficient.

     

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