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This paper presents a backstepping control design for small scale helicopters. The objective is for the helicopter to autonomously track predefined position and yaw trajectories. The position reference trajectories are arbitrary, possibly aggressive, with some constraints in their higher order time derivatives. The main idea of the algorithm is to control the direction and magnitude of the thrust...
This paper presents a numerical approach to the model of a diffraction grating. The proposed method is based on the pulse-train approximation of the Dirichlet function and the effect of this approximation on the grating model. The model presented in this paper simplifies the expression of the physical properties of the grating and shows that the effect of grating is independent of the wavelength of...
This paper presents applications in which electron beam induced deposition (EBID) is used to characterize, analyze, and fabricate, nanostructures and devices. High aspect ratio cylindrical ultra sharp (CUS) atomic force microscope (AFM) probe tips are grown on discarded AFM tips using EBID. AFM is done using these CUS probe tips and compared to standard commercially available AFM probes as a baseline...
This paper presents a practical and simple approach to the design of autonomous flight control of miniature helicopters. It considers a standard easily tunable PID control as the starting step of the design. Then, robust loop-shaping techniques are applied to derive a controller with optimal properties with respect to robustness, noise sensitivity, and bandwidth. Comprehensive analysis and simulation...
Ultrawideband UWB has drawn the interest among the research and standard communities due to its low power consumption, which enables it to coexist with many concurrent narrowband services in the huge bandwidth range (3.1-10.6 GHz). However, these narrowband signals can affect considerably the bit error performance, the range, and capacity of UWB receivers due to the high relative power of these signals...
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