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ABSTRACT: A steering law design for single gimbal control moment gyros (CMGs) for spacecraft attitude control is addressed. The novel approach for the new steering law has a close relevance to the well-known singularity robustness method combined with the null motion approach. The proposed predicted singularity robustness (PSR) approach ultimately leads to an optimized solution of gimbal rates with performance improvement to avoid singularity by robust gradient null vectors. To apply it to practical systems, a singularity index, so-called inner-product index , is also introduced. The null vector induced from the suggested index provides a more reliable and robust way of escaping singular states than that of the well-known condition number index. Performance of the proposed algorithm is demonstrated by using a ground experimental hardware simulator equipped with four single gimbal CMGs floating on top of an air bearing.
IEEE Transactions on Control Systems Technology 08/2009; · 1.77 Impact Factor
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ABSTRACT: This paper present a cooperative control scheme for electronic attack of multiple electronic combat air vehicles (ECAV). The stealthy ECAVs equipped with electronic counter measures (ECM) can deceive a radar by using range delay deception technique. This make the radar to detect a fake target called Phantom beyond the ECAV location. Phantom track is generated by using sequential location of Phantom. The important feature of generating phantom track is kinematic and dynamic constraints. These constraints restrict the freedom of Phantom. The equation of motion and the constraints of the phantom are driven. The final problem is finding the control inputs to generate phantom track. So the problem can be handled as an optimal control problem with dynamic equation and constrains. Optimal cooperative control problem to deceive radar networks using multiple ECAVs is formulated to and some approaches to solving the technical problems are described.
Control, Automation and Systems, 2008. ICCAS 2008. International Conference on; 11/2008
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ABSTRACT: This paper presents a cooperative control scheme for electronic attack of multiple electronic combat air vehicles (ECAVs). The stealthy ECAVs equipped with ECM can deceive the radar by using range delay deception technique. This makes the radar to detect a fake target called phantom beyond the ECAV location. The important feature of generating phantom track is kinematic and dynamic constraints. These constraints restrict the freedom of Phantom tracks. This paper presents three-dimensional mathematical relationships between the motion of the ECAV and the motion of the phantom. Based on the mathematical model, the trajectory generation problem is formulated as an optimal control problem. The control input parameterization converts the optimal control problem into the parameter optimization problem with inequality constraints. This problem is solved by using the sequential quadratic programming method. The numerical result for the optimal phantom trajectory generation is presented.
SICE Annual Conference, 2008; 09/2008
