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Uncertainty and Disturbance Estimator Based Robust Pitch Autopilot
Rakshith Vishwanatha,Sharath Rao,Abhishek Basrithaya,T.S. Chandar 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
In recent times, control design with disturbance estimation and rejection techniques for nonlinear systems have gained popularity. In this study, a control technique called Uncertainty and Disturbance Estimator (UDE) has been presented for a missile pitch autopilot. To control the nonlinear nominal missile model, an Input Output Linearization (IOL) controller has been designed. Since pitch plane dynamics contain considerable uncertainties, IOL has been augmented with UDE to robustify the system. A Luenberger like UDE observer has also been designed and system stability analysis has been performed on the IOL augmented UDE based Controller-Observer. Simulations under various operating conditions have been carried out to illustrate the performance of UDE. A comparative study has also been performed with other prominent nonlinear robust control laws and it was seen that UDE performed significantly better.
Stego for Secure Communication
Shantala C.P,K.V. Vishwanatha 사단법인 인문사회과학기술융합학회 2015 예술인문사회융합멀티미디어논문지 Vol.5 No.5
Applying steganography for the images like JPEG is not straight forward process due to its lossy compression. The objective of this paper is to carry out a brief research on steganography. Based on the research findings, develop and implement a steganographic application to hide data in a computer image file, as well as retrieve the hidden data from the image containing the hidden data and improving the hiding capacity by encrypting and compressing the data.