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In order to meet the bandwidth need of modern wideband digital reconnaissance receiver, an implementation based on compressed sensing is proposed. The compressed sensing method is directly used to sample and reconstruct multi-band RF signal in this receiver. The original signal is mixed with Bernoulli random signal, and then filtered by low-pass filter. As completing the multiple narrow-band signals...
The flight environment of aircraft is very complex, it is necessary that the reconfigurable flight control system possesses a strong robust stability. The sliding mode variable structure control doesn't rely on accurate aircraft mathematic model, and can overcome inner model uncertainty and exterior disturbance in the system, to make the system to track reference model as high precision. A design...
The ducted fan UAV was simply introduced in this paper. The dynamics characteristic was also analysed. The dynamics scalar equation of mass centre motion and surround mass centre motion of aircraft were built. The lift, drag, yawing force and pitch, drift, roll moment of UAV were analyzed through FLUENT simulation software. Simulation image with good effect was got. The dynamics characteristic of...
Support Vector Machine (SVM) is the focus of failure diagnose field. There is not a definite theory to guide the choice of its parameters. In this paper, the analysis and research is done to parameter optimization of SVM. The combined algorithm based on Quantum-behavior Particle Swarm Optimization (QPSO) and Simulated Annealing (SA) is present to optimize the parameters of SVM in order to improve...
Based on the model following control method, a sliding mode controller is designed for the flight control system with wind disturbances. With this controller, the controlled plant can track the reference model outputs precisely. It is shown that this scheme provides better performance for the flight control system with uncertain disturbances. In this paper, we employ the advantages of the model following...
A sliding mode controller based on model following control is designed for the flight control system with uncertainties and perturbations. With this controller, the controlled plant can track the reference model precisely. It is shown that this scheme provides better performance for the flight control system and the fault tolerant control objective is achieved. The proposed scheme has the advantages...
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