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Sea Clutter Cancellation Using Chaotic Signal Processing
, M.Sc. Thesis Sharif University of Technology ; Nayebi, Mohamad Mahdi (Supervisor)
Abstract
Our ultimate goal in this thesis is to design a chaotic receiver for detecting small targets in sea clutter. Sea clutter at low grazing angle has a spiky behavior and in this thesis we desire to model this irregular behavior in the chaos theory frame work. Using a trend similar to statistical detection theory, we will obtain the suboptimal chaotic receiver and investigate the receiver noise effect on the optimality or sub optimality of the detector. Chaotic detector can be used in the coherent and non coherent mode. Although the coherent detector has a superior performance, the efficiency of the non coherent detector is acceptable as well. We will investigate the efficiency of the chaotic...
Applications of Hough Transform in Frequency Domain for Radar Systems
, M.Sc. Thesis Sharif University of Technology ; Nayebi, Mohammad Mehdi (Supervisor)
Abstract
Hough transform is frequently used in radar applications. The structure of using this transformation in radars is so that it has been used only in Range radars which transmit short pulses and their primary goal is to make better estimation of the range of the targets. In this work, we introduce the ways in which we can use the Hough transform in Doppler radars which transmit long pulses and their primary goal is to make better estimation of target doppler. We must use Hough transform in time-doppler domain for this class of radars including continuous-wave radars. To prepare this time-doppler domain image some time-frequency transform must be applied to the radar received signal and a part...
Design and Implementation of a 15 dBm CMOS Power Amplifier
, M.Sc. Thesis Sharif University of Technology ; Medi, Ali (Supervisor)
Abstract
Today, phased array antennas have important role in wireless communication systems. Utilizing optimum channel capacity, having better signal to noise ratio and, high data rate are the most important features of these systems. These systems are composed of several thousands of separated transceivers which provide possibility of directional electromagnetic radiation by changing the phase and the amplitude of the signal in each transceiver independently. So, the main components of such a system are amplifiers, phase shifters and, amplitude controllers. Also a high resolution phased array military radar system is another vital applications of these systems at frequency band of 9-10 GHz. The...