| 引用本文: | 沈红新,李海阳,彭祺擘.月球返回舱再入制导律设计.[J].国防科技大学学报,2010,32(4):7-12.[点击复制] |
| SHEN Hongxin,LI Haiyang,PENG Qibo.Entry Guidance Law Design for Lunar Return Crew Module[J].Journal of National University of Defense Technology,2010,32(4):7-12[点击复制] |
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| 月球返回舱再入制导律设计 |
| 沈红新, 李海阳, 彭祺擘 |
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(国防科技大学 航天与材料工程学院，湖南 长沙 410073)
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| 摘要: |
| 针对以接近甚至超过第二宇宙速度再入地球的登月飞行器制导任务，研究了满足热流、过载、落区等约束的返回舱再入制导律。月球返回舱是低升阻比弹道升力式再入飞行器，控制策略是改变倾侧角的符号和大小。倾侧角大小的确定转化为一个单变量非线性方程求根的问题，倾侧角符号的确定依倾侧反转逻辑来满足横向走廊，其中横向走廊设计成速度的函数。通过综合偏差的Monte Carlo 仿真评价制导算法的性能，仿真结果表明制导的纵向标准偏差在30km左右，横向标准偏差小于5km。此外，分析了影响滚转速率的因素，给出了调整反馈增益系数和减小滚转速率及制导精度的关系。 |
| 关键词: 月球返回 再入 制导算法 纵程偏差 横程偏差 |
| DOI： |
| 投稿日期：2010-01-18 |
| 基金项目:国家自然科学基金项目(10902121) |
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| Entry Guidance Law Design for Lunar Return Crew Module |
| SHEN Hongxin, LI Haiyang, PENG Qibo |
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(College of Aerospace and Materials Engineering, National Univ. of Defense Technology， Changsha 410073, China)
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| Abstract: |
| Aiming at entry guidance mission of a mooncraft with the second universe velocity more or less, the reentry guidance law which meets various constraints, including G-load, heating and landing site location constraints, was studied. The lunar return crew module is a ballistic-lift vehicle with low lift-to-drag ratio, the strategy calls for controlling the trajectory by modulation of the magnitude and sign of the vehicle's bank angle. The determination of the magnitude of bank angle was formulated as a nonlinear univariante root finding problem, while the sign of the angle was dependent upon the reversals in accordance with the lateral corridor, which was treated as a function of velocity. Integrated dispersions Monte Carlo simulations were performed to evaluate the performance of the proposed approach, and the results show that the downrange standard deviation is about 30 km, and the cross range standard deviation is smaller than 5 km. In addition, the working factors on bank rate are analyzed, and the relation between the feedback gain factor regulation and guidance precision is proposed. |
| Keywords: lunar return reentry guidance law downrange error crossrange error |
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