APPROXIMATE MINIMUM-TIME CONTROL VERSUS THE PEG CONTROL FOR LUNAR ASCENT

被引：0

作者：

Hull, David G. ^{[1
]}

机构：

[1] Univ Texas Austin, Dept Aerosp Engn & Engn Mech, ASE EM, Austin, TX 78712 USA

来源：

ASTRODYNAMICS 2009, VOL 135, PTS 1-3 | 2010年 / 135卷

关键词：

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The minimum-time control for constant-thrust lunar ascent is simplified by assuming that the thrust inclination is small. Because the downrange cannot be prescribed, the resulting control obeys a linear tangent law. The approximate minimum-time control can be determined completely analytically, that is, no iterations are required to obtain the control. Powered Explicit Guidance (PEG) is reviewed, and it is shown that the downrange cannot be prescribed. However, the control is made to satisfy a bilinear tangent law, so that the PEG control is not the minimum-time control. Also, it is not completely analytical since an iteration is needed to calculate the final time. However, both controls used in a sample and hold guidance scheme perform equally well.

引用

页码：1813 / 1819

页数：7

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