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Space Robotics is a relatively new field of science and engineering that was developed as an answer to growing needs created by space exploration and space missions. New technologies had to be invented and designed in order to meet demands in extremely hostile environments. Those technologies have to work in a gravityless environment, rarefied atmo...
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Citations
... However, even missions to explore our moon had its own share of challenges. [2] ...
... One type is called Landers, which are basically stationary robots used for tasks like finding minerals and conducting their analysis. [2] The Mars Pathfinder mission had two types of robots. The Lander was called Pathfinder and the rover was Sojourner. ...
... Mars Exploration Rovers (January 2004) were successfully operated remotely. [2] ...
Rendezvous is one of the fundamental phases of on-orbit servicing (OOS) missions. Since it requires high accuracy and safety, modeling is an indispensable part. Therefore, this article puts forward an approach for boosting the exactitude of the final proximity phase of a servicer spacecraft using precise modeling. Unlike other similar works that solely use linear models to design controllers, this paper employs a fully nonlinear model and considers most possible uncertainties and disturbances. In this regard, first a complete nonlinear relative pose (i.e., concurrent position attitude) motion dynamic is developed, which includes (1) the role of the reaction wheels and (2) the major environmental force and torque model. Second, taking the thruster's adverse torque into account, two sliding mode-based control techniques with different nonlinear sliding surfaces are designed. Moreover, the Lyapunov stability criterion is used to handle high nonlinearity effects, control input saturation, actuator misalignment, external disturbance torque/force, measurement error, uncertainties of both inertia parameters, and control inputs. Even the PWPF modulator of the thrusters has been considered to make the outcomes more realistic. Finally, three different scenarios are comprehensively simulated to illustrate the feasibility and efficiency of the designed scheme. The results prove that the proposed closed-form controller is more executable to implement than other existing approaches.
