Attitude stabilization and control of earth satellites

1965 ◽  
Vol 4 (4) ◽  
Author(s):  
O.H. Gerlach
Keyword(s):  
Attitude Stabilization ◽  
And Control

Range Prediction and Trajectory Correction of Long Range Rocket with Attitude Stabilization

2012 ◽  
Vol 232 ◽  
pp. 299-304
Author(s):  
Ke Yong Li ◽  
Fen Fen Xiong ◽  
Cheng Zhang ◽  
Shi Shi Chen
Keyword(s):  
Long Range ◽  
Prediction Method ◽  
Longitudinal Direction ◽  
Control Mode ◽  
Attitude Stabilization ◽  
Large Dispersion ◽  
Range Correction ◽  
And Control ◽  
Range Error ◽  
The Impact

The dispersion of long range rocket is significantly suppressed by the attitude stabilization in the boost phase. However, the attitude stabilization system cannot govern the propellant impulse error and mass error, which induces large dispersion in the longitudinal direction. Therefore, it is necessary to conduct range correction in the post-boost phase of flight trajectory. A range prediction method based on the elliptic ballistic theory is proposed in this paper. Elliptic ballistic equations and range estimation equations are derived and the modified range prediction method with correction factor is presented. It is verified that the proposed method can predict the residual flight range accurately. After that, the lateral pulse jets control is presented and utilized to correct the trajectory and eliminate the range error. A unique control law is reported that combines elliptic ballistic theory and control mode for lateral pulse jets. The impact point is directly controlled and rocket dispersion in the longitudinal direction is efficiently reduced.

Constrained Robust Control for Spacecraft Attitude Stabilization Under Actuator Delays and Faults

2017 ◽  
Vol 139 (5) ◽  
Author(s):  
Alireza Safa ◽  
Mahdi Baradarannia ◽  
Hamed Kharrati ◽  
Sohrab Khanmohammadi
Keyword(s):  
Disturbance Observer ◽  
Sufficient Conditions ◽  
Control Input ◽  
Model Uncertainties ◽  
External Disturbances ◽  
Attitude Stabilization ◽  
Delay Effects ◽  
Rigid Spacecraft ◽  
Backstepping Controller ◽  
And Control

This paper deals with the attitude stabilizing control problem for a rigid spacecraft in the presence of model uncertainties, external disturbances, and actuator faults when delay effects and control input constraints are taken into consideration. First, a backstepping method is introduced in the control design for compensating unknown delays in inputs. Then, a disturbance observer is investigated for estimating model uncertainties, external disturbances, and actuator fault effects. The backstepping controller is augmented with the reconstructed information provided by the disturbance observer to make the closed-loop system insensitive to disturbances and faults. Next, the proposed observer–controller structure is redesigned to deal with control constraints. Rigorous proofs show that the developed control under simple sufficient conditions can render the system globally input-to-state stable (ISS). Numerical simulations are presented to illustrate the effectiveness of the proposed controllers.

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