The current issue of the IETE Journal of Research (Vol. 60, No. 5, September–October 2014) contains 5 articles. These articles present on-going research and developments taking place in the broad areas of Electronics and Communication Engineering, Electrical Engineering, and Power systems.
The paper on “Maritime Radar Target Detection in Presence of Strong Sea Clutter Based on Blind Source Separation,” deals with weak target detection problem in presence of clutter that exist in the strong sea clutter Doppler cell. Authors make use of the complex-valued spatio-temporal FastICA (CSTFICA), which is categorized in the field of blind source separation (BSS), under the observation of the marine environment by a fixed monostatic maritime radar in order to separate the useful signal (derived from the target) and the resulting noise of the sea clutter. Based on the presuppositions of the method and the performed experiments, the method seems less (not quite) dependent upon the factors which other methods are dependent upon.
The next paper on “Effect of TCSC on Chaotic Ferro-resonant Oscillations in Voltage Transformer,” presents results on the ferro-resonance nonlinear dynamics in voltage transformers using the chaos theory. Using this theory, the authors claim that changes in system parameters that cause chaotic ferro-resonant oscillations can be better reviewed and analyzed. Thyristor-controlled series capacitors (TCSCs) have been used for series compensation in the transmission line. Behavior of the system in ferro-resonance occurrence, with TCSC, is shown in bifurcation and phase plane diagrams in the paper. The results presented show that TCSCs lead increasing of ferro-resonance in CVT.
In the paper “Design of a DPSK Modem Using CORDIC Algorithm and Its FPGA Implementation” the authors propose a power efficient differential phase shift keying (DPSK) modem that has been implemented using Coordinate Rotation Digital Computer (CORDIC) algorithm in hardware descriptive language (VHDL) code. The CORDIC algorithms are used to generate the carrier in the modulator and to implement the multiplier in the demodulator. Carrier generator on the same chip minimizes the effect of noise significantly. Single-chip implementation provides a low power DPSK modem operating with high frequency which is suitable for wireless communication system. The CORDIC algorithm based DPSK modem is found to be a much efficient system in terms of reduced hardware cost, improved performance, and included flexibility. The proposed modem provides an efficient alternative over conventional DPSK modem. Real-time verification is performed using Kintex-7 FPGA board. The performance of the proposed modem has been compared with a normal DPSK modem implemented in software defined radio kit using Xilinx block and Spartan-6 FPGA.
The paper entitled “A New Method for 2-D Moving Average Model Parameter Estimation” presents a new method for estimating the parameters of two-dimensional series with the MA model. This algorithm is a three-step approach, in the first step, the 2-D MA model is approximated with the 2-D AR model. In the second step, the 2-D AR model parameters were estimated and finally in the third step, the 2-D MA model parameters were calculated by solving the linear equation set constituted by using the AR parameters acquired in the second step. The presented method has good accuracy in standard deviation and mean value; a fact that has been shown by applying this method to a numerical example and presenting the results of simulation.
In the next paper “Improving Video Stabilization Using Multi-resolution MSER Features,” the authors have investigated the application of multi-resolution maximally stable extremal region (MSER) features for improving the video stabilization performance. The authors have proposed to overcome this drawback for video stabilization application by utilizing MSERs which are extracted and matched in a scale pyramid fashion instead of the MSER features detected and matched on a single image resolution. The duplicate MSERs resulting due to the pyramid style detection are removed followed by MSER feature matching for establishing correspondence between video frames to estimate the global motion parameters. Once the global motion parameters are estimated, the accumulated transformation is smoothened followed by motion compensation to construct the stabilized frame. Comparative analysis with the state-of-the-art stabilization methods show improvement in stabilization performance as well as robustness to blurring degradations. The proposed method is easily ported to other feature detectors like KLT and SIFT thereby making the proposed method generic to any feature detector.
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