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This paper introduces a multi-function digital relay to provide a complete protection for the three phase power autotransformers against different types of abnormalities. The conventional methods of differential protection have many drawbacks such as Current Transformer (CT) mismatch, vector group and CT saturation problems which cause a false operation for the relay. A typical ATP-EMTP model for...
In this paper a new conformal array antenna of conical structure has been proposed. A conical phased array antenna can steer the radar beam electronically in both azimuth and elevation to cover a hemi-sphere mesh surrounding the radar antenna. Beam steering can be accomplished either continuously or discretely at definite directions. The proposed technique not only overcomes the limitations of mechanical...
When the radar transmits electromagnetic waves, the target characteristics can be extracted from the received echo signal. During the reception process, the radar carrier frequency will be shifted due to the Doppler effect of moving targets. If a specific target makes any vibration or rotation, an induced frequency modulation on the received echo signal will be occurred generating side-bands around...
In this paper, new optimized multilevel biphase pulse compression codes (MBPCC) with low peak side lobe (PSL) and mean side lobes (MSL) have been investigated. Amplitude and phase coding have been used during the optimization process. In previous studies, biphase codes were optimized using genetic algorithm (GA). The robustness of genetic algorithm in solving optimization problems degrades simultaneously...
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