Dynamic sensorless detection of linear electromagnetic UAV launch

The technical solution of Unmanned Aerial Vehicle (UAV) has the following features: good controllability; simple thrust control; high precision; long operating life; low cost; strong adaptability, repeatability, maneuverability, and imperceptibility. So the UAV has widespread application prospects. The position sensor of the mover of UAV linear electromagnetic ejection is the key component of control system. It has a direct influence on performance, structure, and reliability of the system. As the sensors such as linear photoelectric encoder and magnetic encoder are not able to meet the demand of high speed control, the paper develops the research on the detection methods of the mover position. First, the paper presents a detection method of mover position based on sliding mode observer. Due to the flicker problem of sliding mode observer, the paper then proposes a detection method based on state observer, and the method can result in smooth detected position of the mover. Finally, the simulated results of the ejection verify the validity of the proposed method.