scholarly journals Fast guidance method of lunar landing based on dynamic programming

2021 ◽  
Vol 39 (1) ◽  
pp. 159-166
Author(s):  
Hongqian Zhao ◽  
Honghua Dai ◽  
Zhaohui Dang
Keyword(s):  
Lunar Surface ◽  
Process Time ◽  
Rescue Mission ◽  
Emergency Rescue ◽  
Whole Process ◽  
Guidance Law ◽  
Optimal Guidance ◽  
Multi Stage ◽  
Process Guidance ◽  
Time Optimal

In this paper, a novel multi-stage trajectory transfer and fixed-point landing time optimal guidance method for the lunar surface emergency rescue mission is proposed. Firstly, the whole process motion and dynamics model for the lunar surface emergency rescue with four stages are established. Then, in the initial orbit transfer phase, the Lambert algorithm based on "prediction + correction" is designed for the non spherical gravitational perturbation of the moon. In the powered descent phase, the Hamiltonian function is used to design a time suboptimal explicit guidance law that can be applied in orbit in real time. Finally, aiming at the multi-stage global time optimal guidance, the whole time process guidance law is obtained by establishing the allowable control set for each stage in the whole process. The simulation results show that compared with the piecewise optimal control method, the present method has better optimization effect and shorter whole process time. It is of great significance to the possible emergency rescue mission of manned lunar exploration in the future.

Multi-Stage Emergency Resources Management Based on Supply Chain

2014 ◽  
Vol 635-637 ◽  
pp. 1780-1783
Author(s):  
Jing Mu ◽  
Lin Lin Liang
Keyword(s):  
Supply Chain ◽  
Resource Management ◽  
High Efficiency ◽  
Public Affairs ◽  
Rescue Work ◽  
Resources Management ◽  
Emergency Rescue ◽  
Whole Process ◽  
Multi Stage ◽  
Emergency Resource

In recent years, the abrupt public affairs occur frequently. Emergency resources as a kind of special resource which have a key role in the rescue after disaster happen suddenly. Then whether emergency resource management is high efficiency directly affect the emergency rescue work can achieve the desired results. In this article we analysis each phase of emergency resources supply chain based on the four stages of emergency rescue process theory. Then integrate the emergency resources management with various stages. At last, we will find a way which satisfying emergency management in different stages and the whole process of emergency resource management. Meanwhile, we combine the current situation that emergency resource often more than enough for the emergency rescue arousing the public’s attention and mainly analysis how to recycle the resource that is in the recovery stage.

Optimal Guidance Law Based on Virtual Sliding Target

2017 ◽  
Vol 30 (3) ◽  
pp. 04016097 ◽  
Author(s):  
Mohiyeddin Mozaffari ◽  
Behrouz Safarinejadian ◽  
Tahereh Binazadeh
Keyword(s):  
Guidance Law ◽  
Optimal Guidance

Design and Instruction Solution of an Optimal Guidance Law for Ship-Air Missile beyond Visual Range

2012 ◽  
Vol 433-440 ◽  
pp. 3831-3836
Author(s):  
Yong Tao Zhao ◽  
Yun An Hu
Keyword(s):  
Control Variable ◽  
Linear Quadratic ◽  
Linear Quadratic Optimal Control ◽  
Guidance Law ◽  
The Earth ◽  
Optimal Guidance ◽  
Quadratic Optimal Control ◽  
Simulation Results ◽  
Visual Range ◽  
Terminal Guidance

For the case of ship-air missile intercepting the low target beyond visual range by ship-ship coordination, the instruction solution model was presented and an optimal guidance law was designed considering the effect of the curvature of the earth. In the midcourse and terminal guidance segment, the optimal guidance law was designed through applying the concept of the pseudo control variable and the theory of the linear quadratic optimal control. The information of the target was described in the launch coordinates through coordinate transformation to realize the instruction solution for the designed guidance law. The simulation results show that the model of the instruction solution is correct and the designed guidance law is feasible.

An Optimal Guidance Law with Velocity Rendezvous Angle Constraint

2015 ◽  
Vol 22 (8) ◽  
pp. 8-11
Author(s):  
徐兴元 XU Xing-yuan ◽  
郭晨鲜 GUO Chen-xian ◽  
潘晓东 PAN Xiao-dong ◽  
宋晓娜 SONG Xiao-na
Keyword(s):  
Guidance Law ◽  
Optimal Guidance

scholarly journals Analysis of the Influence of Trace Point Step-Jump Behavior

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Yao Yang ◽  
Yang Xu ◽  
Pei Wang
Keyword(s):  
Recovery Time ◽  
Sliding Mode ◽  
Initial Step ◽  
Guidance System ◽  
Adjoint Model ◽  
Proportional Navigation ◽  
Guidance Law ◽  
Optimal Guidance ◽  
Fundamental Reason ◽  
Terminal Guidance

To explore the influence of the trace point step-jump behavior on a terminal guidance system, an analysis is performed from the line-of-sight rate (LOS rate) and guidance accuracy views for designing an anti-step-jump guidance law. First, the linear terminal guidance model under the trace point jump circumstance is constructed, and then the fundamental reason for the miss distance is investigated by deriving the upper bound of the LOS rate at the initial step-jump moment. Following this, the novel proposed analytical differential adjoint model is established with the adjoint method, and its validity is demonstrated comparing with the numeric derivative model. Based on the adjoint model, the effects of the ratio coefficient, the time constant, and the jump amplitude on the guidance accuracy are explored. Finally, a novel anti-step-jump guidance law is designed to shorten the recovery time of the overload. The simulations have shown that the faster recovery time and higher accuracy are achieved in comparison with the proportional navigation guidance, optimal guidance, and adaptive sliding mode guidance.

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