逆金字塔式安全着陆点选择方法  

A Safe Landing Site Selection Method Based on Inverse Pyramid

作　　者：陈丽平[1] 顾征[1] 陈春亮[1] 李铁映[1] 王彤[1] 曹宇[1] 刘加明[1] CHEN Li-ping;GU Zheng;CHEN Chun-liang;LI Tie-ying;WANG Tong;CAO Yu;LIU Jia-ming(Beijing Institute of Spacecraft System Engineering,Beijing 100094,China)

机构地区：[1]北京空间飞行器总体设计部,北京100094

出　　处：《宇航学报》2021年第8期967-974,共8页Journal of Astronautics

基　　金：国家中长期科技发展规划重大专项。

摘　　要：针对现有地外天体软着陆安全着陆点选择方法的不足,设计了逆金字塔式安全着陆点选择方法,结合着陆器的落点精度和自主避障及地形坡度适应能力,建立了基于平整点、安全着陆点、可靠避障点和标称着陆点的地形安全性分析与定量搜索模型,该模型呈四层逆金字塔结构,每一层搜索的结果作为下一层搜索的输入,从弱约束到强约束逐步收敛至100%地形安全着陆区,嫦娥五号探测器飞行结果表明该方法能够快速确定安全着陆区及标称着陆点,并有效指导着陆下降过程的标称航迹设计和轨道控制策略制定。In view of the deficiency of the existing safe landing site selection method for planetary soft-landing,a safe landing site selection method base on inverse pyramid is proposed in this article.Combined with the landing point accuracy,autonomous obstacle avoidance ability and terrain slope adaptability of the lander,a terrain safety analysis and quantitative search model is established based on leveling point,safe landing point,reliable obstacle avoidance point and nominal landing point.The model have a four-layer inverse pyramid structure in which the results of each layer are used as the input of the next layer search,progressively converging to 100%terrain safe landing area from weak constraint to strong constraint.The flight results of Chang’e-5 show that the method can quickly determine the safe landing area and nominal landing site,and effectively guide the design of landing descent nominal flight path and the formulation of orbit control strategy.

关 键 词：逆金字塔 安全着陆点 安全着陆区 地形分析 

分 类 号：V476.3[航空宇航科学与技术—飞行器设计]