MULTI-ROTOR UNMANNED AERIAL VEHICLE CONTROL SYSTEM BASED ON HYBRID NEUROREGULATOR
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Compact multirotor unmanned aerial vehicles are used to solve a variety of problems, from aerial photography to reconnaissance and goods delivery, but at present, their widespread use is constrained by the imperfection of stabilization and navigation systems. The problem can be solved by methods of neurocontrol, which are known to be an essential tool when nonlinear behavior of the craft should be taken into account. A new approach for creation of a multirotor aircraft control system is considered based on a hybrid parallel neurocontroller that uses an artificial neural network of radial basis functions. Parallel neurocontrol provides for the simultaneous use of both the conventional proportional-integral-derivative controller and the neurocontroller in the control loop, their outputs being combined. In order to optimize the calculations performed during the second layer of the neurocontroller network training, a piecewise linear function of N segments, symmetric about zero, was chosen as the function for activating the neurons of the second layer. A low-cost method is proposed for parameter optimization of the activation functions of the hidden layer neurons. It allows for network training in real time. The proposed hybrid parallel neurocontroller is implemented and studied based on an artificial neural network of radial basis functions. Bench tests have shown that the stabilization of the three axes of the hybrid neurocontroller provides quality control better than a conventional manually tuned proportional-integral-derivative controller, namely, reducing the transition time, lower amplitude oscillations in the stabilization of the unmanned aerial vehicle and increase the stability of the craft to external influences. The use of hybrid parallel neurocontroller will help to solve the problems of maneuvering and stabilization of the craft for the transition to the local navigation problem solution.
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