scholarly journals Design, Optimal Guidance and Control of a Low-cost Re-usable Electric Model Rocket

2021 ◽  
Author(s):  
Lukas Spannagl ◽  
Elias Hampp ◽  
Andrea Carron ◽  
Jerome Sieber ◽  
Carlo Alberto Pascucci ◽  
...  
Keyword(s):  
Low Cost ◽  
Electric Model ◽  
Guidance And Control ◽  
Optimal Guidance ◽  
And Control

scholarly journals Neighboring Optimal Guidance and Constrained Attitude Control for Accurate Orbit Injection

2021 ◽  
Author(s):  
Mauro Pontani ◽  
Fabio Celani
Keyword(s):  
Attitude Control ◽  
Initial Position ◽  
Low Earth Orbit ◽  
Guidance And Control ◽  
Optimal Guidance ◽  
Combined Use ◽  
Upper Stage ◽  
Neighboring Optimal Guidance ◽  
And Control ◽  
Guidance Technique

AbstractAccurate orbit injection represents a crucial issue in several mission scenarios, e.g., for spacecraft orbiting the Earth or for payload release from the upper stage of an ascent vehicle. This work considers a new guidance and control architecture based on the combined use of (i) the variable-time-domain neighboring optimal guidance technique (VTD-NOG), and (ii) the constrained proportional-derivative (CPD) algorithm for attitude control. More specifically, VTD-NOG & CPD is applied to two distinct injection maneuvers: (a) Hohmann-like finite-thrust transfer from a low Earth orbit to a geostationary orbit, and (b) orbit injection of the upper stage of a launch vehicle. Nonnominal flight conditions are modeled by assuming errors on the initial position, velocity, attitude, and attitude rate, as well as actuation deviations. Extensive Monte Carlo campaigns prove effectiveness and accuracy of the guidance and control methodology at hand, in the presence of realistic deviations from nominal flight conditions.

scholarly journals Applied Model-Based Analysis and Synthesis for the Dynamics, Guidance, and Control of an Autonomous Undersea Vehicle

2010 ◽  
Vol 2010 ◽  
pp. 1-23 ◽  
Author(s):  
Kangsoo Kim ◽  
Tamaki Ura
Keyword(s):  
Dynamic Model ◽  
Equations Of Motion ◽  
Environmental Disturbances ◽  
Guidance And Control ◽  
Model Based ◽  
Optimal Guidance ◽  
Analysis And Synthesis ◽  
Undersea Vehicle ◽  
And Control ◽  
Model Based Analysis

Model-based analysis and synthesis applied to the dynamics, guidance, and control of an autonomous undersea vehicle are presented. As the dynamic model for describing vehicle motion mathematically, the equations of motion are derived. The stability derivatives in the equations of motion are determined by a simulation-based technique using computational fluid dynamics analysis. The dynamic model is applied to the design of the low-level control systems, offering model-based synthetic approach in dynamics and control applications. As an intelligent navigational strategy for undersea vehicles, we present the optimal guidance in environmental disturbances. The optimal guidance aims at the minimum-time transit of a vehicle in an environmental flow disturbance. In this paper, a newly developed algorithm for obtaining the numerical solution of the optimal guidance law is presented. The algorithm is a globally working procedure deriving the optimal guidance in any deterministic environmental disturbance. As a fail-safe tactic in achieving the optimal navigation in environments of moderate uncertainty, we propose the quasi-optimal guidance. Performances of the optimal and the quasi-optimal guidances are demonstrated by the simulated navigations in a few environmental disturbances.

scholarly journals A New Concept for Atmospheric Reentry Optimal Guidance: An Inverse Problem Inspired Approach

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Davood Abbasi ◽  
Mahdi Mortazavi
Keyword(s):  
Inverse Problem ◽  
Analytical Solution ◽  
Atmospheric Reentry ◽  
Guidance And Control ◽  
Optimal Guidance ◽  
Future Space ◽  
Path Constraints ◽  
And Control ◽  
Drag Ratio ◽  
Lift To Drag Ratio

This paper presents a new concept for atmospheric reentry online optimal guidance and control using a method called MARE G&C that exploits the different time scale featured by reentry dynamics. The new technique reaches a quasi-analytical solution and simplified computations, even considering both lift-to-drag ratio and aerodynamic roll as control variables; in addition, the paper offers a solution for the challenging path constraints issue, getting inspiration from the inverse problem methodology. The final resulting algorithm seems suitable for onboard predictive guidance, a new need for future space missions.

scholarly journals Guidance and Control Method for Vehicle with Strap-down Seeker

2019 ◽  
Vol 291 ◽  
pp. 01003
Author(s):  
Li Fugui ◽  
Jia Shengwei ◽  
Tong Zeyou ◽  
Zhao Changjian ◽  
Li Yahui ◽  
...  
Keyword(s):  
Kalman Filter ◽  
Extended Kalman Filter ◽  
Control Method ◽  
Guidance System ◽  
Measurement Unit ◽  
Flight Vehicle ◽  
Guidance And Control ◽  
Guidance Law ◽  
Optimal Guidance ◽  
And Control

Guidance and control method was presented in this paper for flight vehicle with a strap-down seeker. Firstly, an extended Kalman filter was constructed in LOS (line of sight) coordinate system to estimate the guidance signal based on the information measured by strap-down seeker and inertial measurement unit. Secondly, an optimal guidance law which could reduce the target maneuvering and guidance system dynamics was proposed. Thirdly, three-loop acceleration autopilot with pseudo-angle of attack feedback was presented to control the flight vehicle. Finally, the proposed methods were simulated under typical condition. The simulation results demonstrated that the proposed methods were valid, and good performance could be achieved by the guidance and control method with the guidance signal estimated by the extended Kalman filter.

Normal acceleration response to canard control with wind for spin-stabilized projectiles

2020 ◽  
Vol 234 (9) ◽  
pp. 1473-1490
Author(s):  
Yu Wang ◽  
Jiyan Yu ◽  
Xiaoming Wang
Keyword(s):  
Deflection Angle ◽  
Coupling Effect ◽  
Low Cost ◽  
Translational Motion ◽  
Measurement Information ◽  
Control Input ◽  
Acceleration Response ◽  
Guidance And Control ◽  
And Control ◽  
Normal Acceleration

In this investigation, the normal acceleration response to the control inputs of spin-stabilized projectiles considering the atmospheric wind with the coupled effects of canard control, gravity, and aerodynamic forces, being an important reference for the guidance design of low-cost guided projectiles with less measurement information (only translational motion), is deduced and analyzed. Based on the approximate formulas predicting the angle of attack under canard control and considering the atmospheric wind obtained by a linear model of the pitch and yaw motion, estimated expressions for the normal acceleration response to canard control are deduced and analyzed. To analyze the cross-coupling between pitch and yaw and simplify the design of guidance and control, the acceleration response is divided into controllable and uncontrollable parts. The phase shift between the controllable acceleration response and the direction of the control input is defined to represent the coupling effect between the pitch and the yaw; this is found to be strongly dependent on the projectiles' state parameters rather than the control parameters. The results indicate that the acceleration and phase are dramatically altered under different control directions. This condition adversely affects guidance and control because uncontrollable directions arise when the deflection angle is smaller than the critical angle.

Optimal Guidance and Control of Lunar Landers with Non-throttable Main Engine

2011 ◽  
pp. 451-463 ◽  
Author(s):  
Thimo Oehlschlägel ◽  
Stephan Theil ◽  
Hans Krüger ◽  
Matthias Knauer ◽  
Jan Tietjen ◽  
...  
Keyword(s):  
Guidance And Control ◽  
Optimal Guidance ◽  
Main Engine ◽  
And Control
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