skip entry
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2020 ◽  
Author(s):  
Runqi Chai ◽  
Al Savvaris ◽  
Antonios Tsourdos ◽  
Senchun Chai

Author(s):  
Y. Enmi ◽  
W. Qian ◽  
K. He ◽  
D. Di

This paper develops numerical predictor–corrector skip en try guidance for vehicles with low lift-to-drag L/D ratio during the skip entry phase of a Moon return mission. The guidance method is composed of two parts: trajectory planning before entry and closed-loop gu idance during skip entry. The result of trajectory planning before entry is able to present an initial value for predictor–corrector algorithm in closed-loop guidance for fast convergence. The magnitude of bank angle, which is parameterized as a linear function of the range-to-go, is modulated to satisfy the downrange requirements. The sign of the bank ang le is determined by the bank-reversal logic. The predictor-corrector algorithm repeatedly applied onboard in each guidance cycle to realize closed-loop guidance in the skip entry phase. The effectivity of the proposed guidance is validated by simulations in nominal conditions, including skip entry, loft entry, and direct entry, as well as simulations in dispersion conditions considering the combination disturbance of the entry interface, the aerodynamic coefficients, the air density, and the mass of the vehicle.


2017 ◽  
Vol 53 (5) ◽  
pp. 2385-2398 ◽  
Author(s):  
Runqi Chai ◽  
Al Savvaris ◽  
Antonios Tsourdos ◽  
Yuanqing Xia

2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Yin Wang ◽  
Keming Yao

A medium lift-to-drag ratio lunar return vehicle with trim-flaps is presented in this paper. The trajectory optimization design under heat-rate constrain for skip entry lunar return vehicle is analyzed. The optimization problem with a first-order state constraint is introduced. The trajectory applying the Pontryagin maximum principle under the performance of minimum heat is optimized, and the optimal expression of lift coefficient is derived. The simulation studies show that this research method can decrease the heat-rate effectively.


2015 ◽  
Vol 117 ◽  
pp. 8-18 ◽  
Author(s):  
Zong-Fu Luo ◽  
Hong-Bo Zhang ◽  
Guo-Jian Tang

2015 ◽  
Vol 52 (3) ◽  
pp. 813-826 ◽  
Author(s):  
Robert A. Bettinger ◽  
Jonathan T. Black ◽  
Jeremy S. Agte

2014 ◽  
Vol 30 (6) ◽  
pp. 973-982 ◽  
Author(s):  
Zong-Fu Luo ◽  
Hong-Bo Zhang ◽  
Guo-Jian Tang
Keyword(s):  

2014 ◽  
Vol 51 (6) ◽  
pp. 1965-1975 ◽  
Author(s):  
Robert A. Bettinger ◽  
Jonathan T. Black

2014 ◽  
Vol 37 (5) ◽  
pp. 1651-1658 ◽  
Author(s):  
Zong-Fu Luo ◽  
Hong-Bo Zhang ◽  
Guo-Jian Tang
Keyword(s):  

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