الفهرس 
Attitude and altitude stabilization of Quad rotor
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Abstract
Quad rotor is a new class of the aerial unmanned aerial vehicles that could fly and stabilize its motion by couple of rotors that could hover and make a directional motion. Quad rotor has some advantages if we compared it with the helicopters; as it is compact, and has simple mechanical structure with high maneuverability. When the flight is dangerous, monotonous, or not possible even by a skilled pilot, an unmanned quad rotor can give successful results. As it can take-off and land in a limited area, and can easily hover above any target. Helicopters are very complex to study its model, and design the suitable controller which can stabilize them. In the helicopter study, we the pilot can{u201F}t make the control action to stabilize it as it{u201F}s very complex system; so the control design is responsible for taking the required action to stabilize the helicopter to the operating point. The pilot just gives helicopter the required input, and the controller deal with the system to achieve the input from pilot