Dr. Shanmugha Sundaram G. A. currently serves as Assistant Professor at the department of Electronics and Communication Engineering, Amrita School of Engineering, Coimbatore. He pursued his Ph. D. from Indian Institute of Science, Karnataka in 2004. Before joining Amrita, he served as Post - Doctoral Researcher in JIVE - ASTRON, Nederland, EU till 2007.Thereafter he had been in the SKA Radio Telescope Design Studies Working Group involved as Research Scientist till 2009 in their Next - Generation Radio Telescopes initiative.

Dr. Sundaram had been a recipient of the URSI award for Young Scientists 2008 as principal author for submitted & accepted presentation in Commission J of URSI General Assembly 2008, Chicago, IL, USA. He is a full - time member of several professional R&D organizations like AIAA, URSI, NRAO, IAU, MathWorks and FEMLAB. He has experience in sponsored research and consultancy, STEM publishing, academics and general administration.

At Amrita, Dr. Sundaram has been with the Department of Electronics and Communications Engineering and the Centre for Computational Engineering & Networking (CEN), closely associated with their undergraduate programs of the former and the graduate school academic program of the latter, as well as a CORDIS - EU funded research program.


Qualification University Year
PhD - Solar Radio Astronomy Indian Institute of Science 2004
MS - Antennas and RF front-end electronics instrumentation Indian Institute of Science 1999


  • Research Scientist (JIVE-ASTRON, NL, EU, 2007-9)
  • Post-doctoral researcher (JIVE-ASTRON, NL, EU, 2006-7)
  • Post-doctoral researcher (Indian Institute of Astrophysics, Bangalore, KA, India, 2004-6)

    Research Projects

    • Metamaterials
    • Radio Astronomy
    • Satellite Remote Sensing
    • HPEC algorithm development for UAS-based SAR and nuclear radiation detectors
    • Intelligent transportation, Vetronics
    • Vision-based GNC for robots


    • Reviewer for open access international journal "Astrophysics and Space Science" [Springer: Heidelberg]
    • TPC Member and Reviewer of manuscripts for international conferences, viz. EmergiTech 2016, ICACCI 2016, ISTA 2016, VisionNet 2016

    Membership in Professional Bodies

    • India:
      • Astronomical Society of India (ASI)
    • USA:
      • IEEE Computer Society Technical Committee on Parallel Processing
      • National Radio Astronomy Observatory (NRAO)
      • American Institute of Aeronautics and Astronautics (AIAA)
      • Astronomical Society of the Pacific (ASP)
      • COMSOL Multiphysics Inc., COMSOL Reaction Engineering Lab and FEMLAB User Group
      • MathWorks Software for Technical Computing and Model-Based Design Initiative
    • European Union - France:
      • International Astronomical Union (IAU)
      • Committee on Space Research (COSPAR)

    Research Expertise

    Ongoing PhD Works (Guiding)

    • Smart antenna systems for planetary landing RADAR
    • Vision-based autonomous navigation for robots

    PG projects

    • Design of a solar power satellite constellation
    • Algorithms for SAR and multispectral data fusion
    • Hyper-temporal imaging and persistent surveillance
    • Combining Sensors and imaging data for civil structural integrity studies

    UG projects

    • Simulation of heavy metal ion trajectories in electromagnetic environments, for superconducting applications
    • RF filter design


    Invention Disclosure Forms filed with Amrita Patents:

    • Wireless Technologies for Urban Transportation-on-demand
    • OAM Modulation in a Focal Plane Antenna Array (Indian patent granted; US patent filed)
    • Terahertz slotted waveguide based metamaterials structure in a three-dimensional antenna topology
    • Terahertz layered metal-dielectric sandwich metamaterials structure in a planar aperture antenna

    Proposed research opportunities for prospective researchers:

    • Stability issues of platforms conducting stand-off observations in hazardous environments
    • Sensitivity requirements for agile remote sensing aerospace platforms

    Funded Projects

    Completed Project : CORDIS - Infrastructuur-4 SKA Design Study conducted by the Netherlands Foundation for Research in Astronomy (ASTRON), NL and the University of Manchester, UK: Contract No. 011938. The project has been awarded as part of the Sixth Framework Programme (FP6) of the European Union to individuals towards an international effort into next generation science and technology solutions in radio astronomy, called the "SKA Aperture Array Verification Program (AAVP)". The cost accounting is on the basis of products and services realization against expenses incurred over the time-frame 2006 June to 2015 July, and has a funds ceiling of EUR 320.000,00.


    PG Courses:

    • Astrodynamics for Remote Sensing Satellites
    • SAR Signal Processing
    • Space-Time Adaptive Processing: Application to Radar
    • Principles of Satellite Navigation
    • Deep Space Imaging in the Radio Spectrum

    UG courses:

    • Transmission Lines and Waveguides
    • Radio Frequency Engineering
    • Aviation Electronics


    Publication Type: Journal Article

    Year of Publication Title


    K. A. Pradeep Kumar, Dr. Shanmugha Sundaram G. A., Dr. Bharat Kis Sharma, Venkatesh, S., and Dr. T. Rajagopalan, “Advances in gamma radiation detection systems for Emergency Radiation Monitoring”, Nuclear Engineering and Technology, 2020.[Abstract]

    The study presents a review of research advancements in the field of gamma radiation detection systems for Emergency Radiation Monitoring, particularly two major sub-systems namely (i) the radiation detector and (ii) the detection platform – air-borne and ground-based. The dynamics and functional characteristics of modern radiation detector active materials are summarized and discussed. The capabilities of both ground-based and aerial vehicle platforms employed in gamma radiation monitoring are deliberated in depth. More »»


    Dr. T. Rajagopalan, Dr. Shanmugha Sundaram G. A., and Kumar, K. A. Pradeep, “A log-periodic spiral antenna array for L-band radio interferometric imaging”, Journal of Intelligent & Fuzzy Systems, 2020.[Abstract]

    The perfect Y antenna array configuration is among the most prevalent antenna array arrangement used in radio interferometry for synthesis imaging. It is crucial to determine an antenna array configuration that could offer further higher quality radio-images. In this paper, a novel and an efficient L-band log-periodic spiral antenna array design is presented. The radio-imaging performance of the log-periodic spiral antenna array is compared and shown to outperform an equivalent perfect Y antenna array. Radio imaging performance is evaluated using the computational simulation for the proposed L-band log-periodic spiral antenna array and the equivalent perfect Y antenna array. The metric used for evaluation is the Structural Similarity Index (SSIM) and Surface Brightness Sensitivity (SBS). The L-band log-periodic spiral antenna array was observed to have about five times higher bandwidth, 2.24 times greater sensitivity, angular resolution better by a factor of five, and 10% wider field of view than the perfect Y configuration antenna array of comparable extent. It has been analytically demonstrated that the log-periodic spiral antenna array is an optimum configuration based on Chow’ s optimization technique. The L-band log-periodic spiral antenna array has outperformed the perfect Y configuration in many different imaging aspects. More »»


    K. A. Pradeep Kumar, Dr. Shanmugha Sundaram G. A., and Dr. T. Rajagopalan, “Advances in detection algorithms for radiation monitoring”, Journal of Environmental Radioactivity, vol. 217, p. 106216, 2020.[Abstract]

    This paper presents a review of up-to-date advancements in detection algorithms employed in radiation monitoring for generating radiation maps of ground contamination and tracking radioactive release into the atmosphere. Detection algorithms for true count processing, spectroscopy processing, and plume tracking are discussed in chronological order of development. Process steps of detection include height correction, solid-angle correction, background radioactivity correction, Compton continuum elimination, de-noising of gamma-radiation spectra, and recording of plume passage events. More »»


    S. Archana, Dr. Shanmugha Sundaram G. A., and Dr. Soman K. P., “Analysis of precipitating clouds using precipitable water vapour”, Journal of Chemical and Pharmaceutical Sciences, vol. 9, pp. 542-547, 2016.[Abstract]

    The detection of precipitating clouds is necessary for weather prediction and climate researches. Precipitation occurs by condensation when the atmosphere is saturated with water vapour. The aim of the study is to discuss about the variations of Precipitable Water Vapour (PWV) in the case of such clouds. The brightness temperature data of 6.7ìm water vapour channel is primarily used in this study. The saturation mixing ratio can be calculated using temperature and pressure profile data. The study on PWV enhances the weather forecasting models and meteorological studies. In this study, the PWV for different precipitating clouds are estimated for a period of January-December 2014. More »»


    P. R. Sugatha Kumari, Dr. Shanmugha Sundaram G. A., and Dr. Soman K. P., “A case study on cirrus clouds using PWV measurement”, Journal of Chemical and Pharmaceutical Sciences, vol. 9, pp. 559-564, 2016.[Abstract]

    Cirrus (Ci) clouds are high level clouds at an altitude above 6 Km. Ci clouds are composed of ice crystals and responsible for optical phenomenon such as mock suns and halos. Though Ci clouds are non-precipitating in nature, it has considerable role in case of weather forecasting. This paper explores a study of Ci clouds as indicators of fair weather and high altitude wind direction based on Precipitable Water Vapor (PWV) measurement. Brightness Temperature (TB) values from data obtained using satellite water vapor channel, along with pressure and temperature from Global Forecast System (GFS) are used in this study for PWV calculation. Data collected over a period of one year from 1st of January, 2014 to 31st of December, 2014 is considered here. More »»


    P. Kavitha and Dr. Shanmugha Sundaram G. A., “Yield per hectare of rice crop from EOS hyperspectral data analysis”, Journal of Chemical and Pharmaceutical Sciences, vol. 9, pp. 489-493, 2016.[Abstract]

    Rice is one of the routinely consumed diets of Kerala that is commonly cultivated in Palakkad and Malappuram districts. The study here describes the disparity in paddy yield based on different disease infestation levels on paddy crops by analyzing hyper spectral data that are obtained from the EO-1 Hyperion Sensor. In an optical wavelength range the hyper spectral data contains a large number of narrow spectral channels, and they can vary from several tens to a few hundred in number. In this paper, remote sensing technology is used to recognize disease infested plants based on the spectral reflectance of each band in the image; spectral reflectance may change according to the chlorophyll contents. Hyper spectral data is preprocessed using ERDAS IMAGINE 9.2 software. An end member spectrum is then developed by unsupervised classification (K-Mean algorithm) using ENVI 4.7, for automatically cluster pixels to each classes namely, high yield, low yield, moderate yield, and severe yield. The cultivation of rice crop in tonnes of grains per hectare area (6257.11ha) for different variety is determined as an outcome of this study. More »»


    KaMeera Mohan and Dr. Shanmugha Sundaram G. A., “Crop yield estimation using Isodata clustering algorithm on EO-1 Hyperion data a case study of Coconut crop, Kozhikode, Kerala”, Journal of Chemical and Pharmaceutical Sciences, vol. 9, pp. 482-488, 2016.[Abstract]

    Remote sensing is one of the major techniques employed for studying agricultural patterns which tend to be highly dynamic these days. This paper delves into the possibility of finding the yield of coconut crop with hyper spectral remote sensing technology. Hyper spectral images with the advantage of having hundreds of contiguous spectral bands make crop yield monitoring a reality. Yield monitoring and crop growth assessment are very important to be carried out both at the state and national level of a country to estimate the production. In this work coconut yield is estimated by using hyper spectral images captured by the Hyperion sensor deployed on the EO-1 satellite of NASA. Unsupervised classification techniques have been used to identify the different classes present in the dataset. The process of identifying different classes extends from locating the crop under study among the different features on ground to identifying variations in the crop according to the health of the plant, pest infestation, and various other factors. The outcome of the work is evaluated in terms of the spectral reflectance of different classes. The canopy reflectance has a direct implication on crop chlorophyll and thereby their health throwing insight into the yield of the crop. Results obtained are compared with real time reflectance values measured using spectro radiometer and it is found that the hyper spectral image processing is performing on par with the hardware measurements. The health condition which is derived from these reflectance curves gives information about the yield (in lakh nuts) per acre for each class of the crop. More »»


    G. Rashmi and Dr. Shanmugha Sundaram G. A., “Study of lower D-region of ionosphere from VLF signal perturbations”, Journal of Chemical and Pharmaceutical Sciences, vol. 9, pp. 591-593, 2016.[Abstract]

    VLF signal analysis is an effective remote sensing tool to study the conditions and disturbances in ionosphere and hence the level of activity in the sun. The observation of solar flares made during the months of April to June 2015 is presented. The electron density of the ionosphere during the flare onset is also assessed using the International Reference Ionosphere model (IRI). The VLF signals are recorded at receiver site located at Ettimadai, Coimbatore (10.8981°N, 76.9003°E) from the transmitting station VTX (17 kHz) located at South Vijayanagaram, Tuticorin (8.387014°N, 77.752761°E) with Great Circle Path of 294km. The GOES satellite x-ray flux data is used for determining the onset and duration of flare and thus the time delay at the receiver site is assessed. More »»


    S. Manoj and Dr. Shanmugha Sundaram G. A., “Dynamic spectrum of long wave terrestrial radio signals during episodes of ionospheric disturbances caused by solar activity”, Journal of Chemical and Pharmaceutical Sciences, vol. 9, pp. 548-553, 2016.[Abstract]

    The dynamic spectral record of long wave radio signals (kHz band) had registered a disturbed condition of the ionosphere region involved with propagation of these signals. The reason for such signatures in the dynamic spectrogram can be accredited to the impact of Solar Energetic Particles (SEP) on the ionosphere along the propagation path of terrestrial long wave radiation, studied using the Multi-Hop propagation model. Points of reflection in the ionosphere directly above specific locations above the earth where determined. Total Electron Content (TEC) values for such regions were obtained from interputing the Global Positioning System (GPS) data. From a comparison of such results during periods when the Sun was quiet and active periods, the magnitude of ionosphere disturbance contributed by the various active solar phenomena's has been determined. The paper is based on the impact of Geomagnetic storm (Kp=6) on the TEC, that occurred on 16 April 2015. Long wave radio signals from transmitters located in places like United States Navy near Lualualei, Hawaii (Geomagnetic lat 21°25′13.38″, Geomagnetic long 158°09′14.35'W) and Rosnay near France (Geomagnetic lat 46°42′47″N, Geomagnetic long 1°14′39″E) were monitored closely to know extent of the impact. More »»


    Ca Anjana, Sundaresan, Sb, Dr. Shanmugha Sundaram G. A., and Dr. Soman K. P., “Impact Analysis of Wind Farms on Air Traffic Control Radar”, Journal of Chemical and Pharmaceutical Sciences, vol. 9, pp. 580-584, 2016.[Abstract]

    These days, wind vitality use gets to be gigantic which prompts an increment in number of wind turbine establishments. Because of these wind turbines, the electromagnetic waves get impedance and are scattered which brings about the loss of correspondence. In this paper, the unfriendly impacts of wind farms on radar framework is displayed and discussed for Air Traffic Control (ATC) Radar. Coimbatore domestic (ATC) radar working in S-band recurrence gets influenced by wind farms located in Palakkad gap area. Demonstrating of the wind turbines and estimation of Radar Cross-Section (RCS) is done utilizing high frequency EM solver viz., XGtd tool. The investigation of RCS dispersing plot, examination of improved RCS and air traffic issues revels that the wind farms exhibit in viewable pathway and those near to radar influences the framework and results in loss of information which leads to poor air traffic monitoring. More »»


    P. R. Sugatha Kumari and Dr. Shanmugha Sundaram G. A., “Identification of non-precipitating clouds using PWV analysis”, Indian Journal of Science and Technology, vol. 9, 2016.[Abstract]

    Background: The objective of this paper is to identify non-precipitating cirrus, cirrostratus, and cirrocumulus clouds by measuring the Precipitable Water Vapor (PWV). Method: PWV is a measure of the liquid water that obtained if all the water vapor in the atmospheric column is condensed and precipitated which calculated from the water vapor channel data obtained from geostationary satellites. In this paper, places with particular non-precipitating clouds are selected and PWV value is calculated. The study is conducted over a period from 1st January to 31st December of 2014. Results: The range of PWV values measured is used to identify the high level, non-precipitating clouds. Application: PWV values obtained can be used along with more climatic data for cloud classification.

    More »»


    S. A. Abhay, Pavaneeswar, B. R., Gopinath, S., Sriram, B. S., Thomas, S. J., and Dr. Shanmugha Sundaram G. A., “Simulation of the S-Band photon vorticity modulation scheme”, American Journal of Electromagnetics and Applications, vol. 1, pp. 38–43, 2013.[Abstract]

    Electromagnetic (EM) vorticity modulation is a multi-carrier scheme that offers an enhanced spectral efficiency among the several conventional communication technologies. A mathematical model of the beam-front, carrying different orbital angular momentum (OAM) states, in the S-Band region of the radio frequency (RF) spectrum has been presented using the Laguerre-Gaussian (LG) beam, to describe the effect of RF vorticity and OAM modulation. Results from EM simulations are used to verify the orthogonality of OAM states and thereby highlighting its application in a multi-user environment. Two designs of antenna reflectors are being proposed to generate the orthogonal OAM states (l=1 and 2). The existence of the OAM states is visualized from the distribution of the current densities and magnetic fields over the aperture area of the reflectors. More »»


    P. Rajan, K. P. Soman, and Dr. Shanmugha Sundaram G. A., “Weather Pattern Monitoring Using SDR”, International Journal of Advanced Electrical and Electronics Engineering,IJAEEE, vol. 2, no. 2, pp. 63-68, 2013.[Abstract]

    This paper provides a notion about weather station accomplished of receiving and processing satellite signal, in order to produce an image to assist in observing weather conditions. To achieve this, a Quadrifilar Helix antenna (QFH), a receiver and a PC sound card is used in the hardware part. The output from the sound card is recorded as a wave file. This wave file is decoded using processing techniques in various software environments. This paper provides a comprehensive report on antenna construction procedures and signal processing techniques used to achieve a complete readable weather image. Also using these decoded images, how far application oriented information can be retrieved is analysed. More »»


    A. Reghu kumar, Soman, K. P., and Dr. Shanmugha Sundaram G. A., “Beam Forming Algorithm Implementation using FPGA”, International Journal of Advanced Electrical and Electronics Engineering, (IJAEEE), vol. 2, no. 3, pp. 53-7, 2013.[Abstract]

    In this paper we are exploring the fundamental theory of beamforming, adaptive beamforming technique and tried to implement one of the adaptive algorithm called Least Mean Square algorithm using Xilinx system generator.The compact structure of FPGA beamformer can thus be implemented on any of the Xilinx FPGA using the generated VHDL code More »»


    D. Haridas, K. P. Soman, and Dr. Shanmugha Sundaram G. A., “Ionospheric Disturbances due to Solar Activity Detection using SDR”, International Journal of Advanced Electrical and Electronics Engineering, (IJAEEE), vol. 2, no. 2, pp. 69-74, 2013.[Abstract]

    This paper focus on disturbance occurring in ionosphere due to certain phenomena’s like solar flare Coronal Mass Ejection(CME),Sudden Ionospheric disturbances(SID),sunspots etc. The observation from VLF receiver is the keystone for numerous experiments, studies and results on Earth’s ionosphere. The Sun is capable of producing strong radio emission which may directly affect the wireless communication and navigational system without any warning. Using recent techniques different equipment’s can be builtto accomplish these observation using a unified hardware and software. To detect the real time condition of ionosphere, SDR technique and Gnu Radio framework is used. More »»


    Dr. Shanmugha Sundaram G. A. and SK, J. Abraham, “Site-specific configuration metrics for next-generation synthesis array radio telescopes”, Journal of Advances in Space Research, pp. 32-36, 2012.

    Publication Type: Patent

    Year of Publication Title


    Dr. Shanmugha Sundaram G. A., “Systems and methods for transmission and reception of radio waves in a focal plane antenna array”, 2019.[Abstract]

    Systems and methods for transmitting and receiving radio waves includes a parabolic dish, a focal plane antenna array configuration antenna elements arranged in a circular array configuration with array elements positioned along circumference of rings with a distance between each element and coupled a focal disc positioned along a focal plane of the parabolic dish. The array is configured to transmit and receive radio beam patterns with one or more Orbital Angular Momentum states ‘l’ via a transceiver feed assembly. The transceiver includes a transmitter adapted to alter excitation phase of the radio beams of successive elements and generate helical wave fronts in the far-field, and a receiver to enhance the received wave fronts. A total field received by the array configuration is then calculated by a superposition of the fields received by each of the elements.

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    Publication Type: Conference Proceedings

    Year of Publication Title


    Dr. T. Rajagopalan and Dr. Shanmugha Sundaram G. A., “Electromagnetic fields for propagation and confinement of high current heavy ion beam towards conformal thin film deposition”, 2016 IEEE Asia-Pacific Conference on Applied Electromagnetics, APACE 2016. Institute of Electrical and Electronics Engineers Inc., pp. 68-72, 2017.[Abstract]

    Uniform thin layers of heavy elements such as niobium (Nb) have been found to possess superior superconductivity characteristics in applications like radio frequency cavity resonators. The experimental process to realize conformal coating with reproducible characteristics especially on non-planar, cavity resonators rests on the generation of high-current beam of Nb ions. Here, the fundamental principles that govern the motion of such ions in an electromagnetic (e-m) field are investigated. An electric quadrupole is designed via modelling so as to generate desired e-m fields that support parallel propagation as well as confinement of the Nb ions to a desired beam size and shape in ultrahigh vacuum (UHV) conditions. The simulation study presented here considers the case of Nb ions whose currents are of the order of 5 A, that traverse a length of 130 cm and have a cross-section radius of 3.75 cm. The trajectories for Nb ions are simulated, and the effect of external fields on the trajectory of ions is evaluated using appropriate performance metrics. © 2016 IEEE.

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    J. Rajendran and Dr. Shanmugha Sundaram G. A., “Design and Evaluation of Printed Log Periodic Dipole Antenna for an L-band Electrically Steerable Array System”, Computational Systems and Communications (ICCSC). IEEE, Trivandrum, pp. 311-316, 2014.[Abstract]

    RADAR systems that use a phased array and an electronically scanned array of antennas are extensively used in terrestrial applications on account of their vastly improved directive gain over single-element antennas. The effective beam pattern in such cases is a combination of the elemental pattern and the array factor. In this paper, the design and evaluation of a printed log-periodic dipole antenna, that operates in the L-band, is being discussed. The antenna was fabricated on an FR-4 substrate using printed circuit technology; tested and characterized in terms of its S-parameters, return loss, and insertion loss. The radiation pattern in the azimuth and elevation planes has also been determined. The antenna is found to have a directive pattern, and is linearly polarized with a wide bandwidth. The antenna is being designed for use in the front-end of a RADAR system for terrestrial surveillance applications such as landslide detection, and monitoring the productivity of metallicore mines. More »»


    Dr. Shanmugha Sundaram G. A., “SAR data analysis in mineral ore utilization”, Proceedings of SPIE Conference 8891: SAR Image Analysis, Modeling, and Techniques XIII, Dresden, Germany, 23-26 September 2013, SPIE Remote Sensing and SPIE Security+Defence Symposia. Dresden, Germany, 23-26, 2013.


    M. S. Sooraj Subramanian, Siddharth, K. V., Abhinav, S. N., Arthi, V. V., Praveen, K. S., Jayavarshini, R., and Dr. Shanmugha Sundaram G. A., “Design of dual log-spiral metamaterial resonator for X-band applications”, 2012 International Conference on Computing, Communication and Applications, ICCCA 2012. IEEE, Dindigul, Tamilnadu, 2012.[Abstract]

    Dual log-spiral designs that represent inclusions at the elemental level, in the synthesis of metamaterials with negative values of permittivity () and permeability (), are analysed for their application in the X band frequency range based on the equivalent circuit model. The dual log-spiral resonator is useful when it comes to miniaturization for relevant applications. The extended LC model focuses on the impact of start angle in coupling factor and mutual inductance values. Estimation of Scattering parameters, bandwidth of operation and impedance of metamaterial samples is performed. Results from full wave simulation tests on this model are used to accurately design miniaturized artificial magnetic inclusion in a homogeneous material so as to have anomalous values of and . Discussions on the effective role of Artificial Neural Network method as a potent optimization technique in design are also presented. © 2012 IEEE. More »»

    Publication Type: Conference Paper

    Year of Publication Title


    S. S and Dr. Shanmugha Sundaram G. A., “Simulation study on modeling the effects of wind turbine on communication signals (C and X bands) using XGtd”, in Communications and Signal Processing (ICCSP), 2015 International Conference on, Melmaruvathur, 2015.[Abstract]

    Scattering signals on wind turbine may cause the degradation issues in the communication systems which uses Electromagnetic (EM) waves. In order to understand the scattering and interference effects of wind turbines, the study of signal returns from single or several wind turbines is done by plotting the reflection coefficient for different blade materials and thicknesses using the EM solver viz., the XGtd software tool. This is followed by bistatic RCS analysis with different blade orientations for C and X band frequencies, from which the best and worst case blade orientation are determined. More »»


    A. C and Dr. Shanmugha Sundaram G. A., “Simulating the impact of wind turbine on RADAR signals in L and S band using XGtd”, in Communications and Signal Processing (ICCSP), 2015 International Conference on, 2015.[Abstract]

    Wind turbines located near to the Radar system can restrict the performance of the Radar system to detect its targets. In order to understand their degradation effects and interference on Radar signals, the reflection coefficient is studied for different materials used to fabricate the wind turbine blades. This is followed by an estimation of Radar Cross Section (RCS) in the L and S band of the Electromagnetic Spectrum (EM) considering wind turbine as electrically large objects in the EM wave frequency solver environment viz., the XGtd software tool. Additional results are presented for different blade thicknesses and orientations. From the RCS plot, the best and worst blade orientations are determined from radar signal returns. More »»


    Dr. Harish Ram D. S., Srinivasan, S., Srinikethan, M. S., and Dr. Shanmugha Sundaram G. A., “3-D stack of waveguide structures with hour-glass slot structure for terahertz antenna applications”, in 2015 International Conference on Advances in Computing, Communications and Informatics, ICACCI 2015, 2015, pp. 689-693.[Abstract]

    The design of an antenna using metamaterials (MTM) for usage in the Terahertz frequency range is presented here. A detailed analysis of the ω-β curves, scattering (S) parameters and radiation patterns is done for a Composite Right/Left Handed (CRLH) transmission line metamaterials designed as a metal-metal (MM) waveguide that incorporates an hour glass slot unit cell structure. An array of the same in two dimension is studied next. This is followed by a study of the 3D stacked structure of the same MM-MTM. A final design configuration is proposed for application in active antenna systems. © 2015 IEEE.

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    M. S. Srinikethan, Aravind, S., Avinash, N., and Dr. Shanmugha Sundaram G. A., “Two Dimensional Array of Layered Metal-Dielectric Sandwich Structures for Terahertz Applications”, in 2015 International Conference on Advances in Computing, Communications and Informatics, ICACCI 2015, 2015, pp. 684-688.[Abstract]

    In this paper, the design of a front end array for active antenna applications using metamaterial for usage in the terahertz frequency range is discussed. A brief analysis of the scattering parameters, dispersion curves and radiation patterns is done for composite right/left handed (CRLH) transmission line metamaterials that have a metal-dielectric-metal (MDM) layered configuration as their unit cell structure. An array of the same in one and two dimensions is analyzed in order to determine its electromagnetic properties. © 2015 IEEE.

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    J. Abraham K. Sundar and Dr. Shanmugha Sundaram G. A., “Simulated Optimal Log-Spiral Topologies for the Square Kilometer Array”, in Proceedings of the 2014 International Conference on Interdisciplinary Advances in Applied Computing, New York, NY, USA, 2014.[Abstract]

    In the quest to operationalise the next-generation infrastructure that pioneers advancement in state-of-the-art, as regards synthesis array radio telescopes of global repute, the square kilometre array (SKA) assumes significance as the. The science case for the SKA stems from addressing some of the fundamental mysteries in physics at the micro- and macrocosm levels, in the form of Key Science Projects (KSP)s. SKA design and evaluation tasks over novel challenges to the study of array configurations in the spatial. In this paper, the various instrument design specifications are discussed for relative merits and adaptability for the SKA, by invoking well-founded and established array-design and optimization principles offered on a dedicated user-friendly software platform. More »»


    A. D and Dr. Shanmugha Sundaram G. A., “FPGA Implementation Of Beamforming Algorithm For Terrestrial Radar Application”, in Communications and Signal Processing (ICCSP), 2014 International Conference on, Melmaruvathur, 2014.[Abstract]

    Beamforming or spatial filtering combines signals from an array of sensors, to achieve directionality. Each signal is weighted and summed to form a single strong signal from a desired direction of arrival, while suppressing interference. Without mechanical structures the antenna can be steered electronically by adjusting gain and phase. This concept can be used in terrestrial radar application scenarios like open cast mining of metallic mineral core. FPGAs offer higher levels of performance; therefore they are especially appropriate for beamforming applications. Here focus, is to implement adaptive beamforming algorithm known Least Mean Square Algorithm in FPGA. Therefore the relation between Mean Square Error and Iterations and different Step Size are found out. Power Analysis of LMS is presented using Xilinx X Power Analyzer. More »»


    , G., P. V., A., S. Devi, M., M. Kumar, S., V., and Dr. Shanmugha Sundaram G. A., “Simulation of Helical Modulation in a Focal Plane Array”, in Communications and Signal Processing (ICCSP), 2014 International Conference on, 2014.[Abstract]

    In various experiments it had been positively demonstrated that the ability to perform helical modulation, by exploiting the Orbital Angular Momentum (OAM) states of the electromagnetic (EM) waves, is a feasible scheme of digital modulation in the bandwidth-constrained regions of the spectrum. In this paper we shall show that by changing the EM properties to an antenna array, at the focal plane of a parabolic antenna (instead of changing the geometry of the entire aperture), a factor of vorticity can be introduced in the radio waves. The problem becomes relevant in cases where the antenna has larger radial dimensions. At the focal plane of the antenna phase changes are incorporated in the successive elements of the array. Circular arrays made up of discrete elements arranged in different configurations are being used in this exercise. Results from the different arrangements are compared in terms of antenna parameters, and the radiation patterns are obtained for various optimal representations of the OAM states.

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    S. S. Maddikonda and Dr. Shanmugha Sundaram G. A., “SAR image processing using GPU”, in Communications and Signal Processing (ICCSP), 2014 International Conference on, Melmaruvathur, 2014.[Abstract]

    Synthetic aperture Radar (SAR) has been extensively used for space-borne Earth observations in recent times. In conventional SAR systems analog beamsteering techniques are capable of implementing multiple operational modes, such as the Stripmap, ScanSAR, and Spotlight, to fulfill the different requirements in terms of spatial resolution and coverage. Future RADAR satellites need to resolve the complex issues such as wide area coverage and resolution. Digital beamforming (DBF) is a promising technique to overcome the problems mentioned above. In communication satellites DBF technique is already implemented. This paper discuses the relevance of DBF in space-borne RADAR satellites for enhancements to quality imaging. To implement DBF in SAR, processing of SAR data is an important step. This work focused on processing of Level 1.1 and 1.5 SAR image data. The SAR raw data is computationally intensive to process. To resolve the computation problem, high performance computing (HPC) is necessary. The relevance of HPC for SAR data processing using an off-the-shelf graphical processing unit (GPU) over CPU is discussed in this paper. Quantitative estimates on SAR image processing performance comparisons using both CPU and GPU are also provided as validation for the results. More »»


    C. Raghavachari and Dr. Shanmugha Sundaram G. A., “Efficient use of bandwidth by image compression for vision-based robotic navigation and control”, in Communications and Signal Processing (ICCSP), 2014 International Conference on, Melmaruvathur, 2014.[Abstract]

    In the present modern world, humans are being replaced by computers in almost every field for various beneficial reasons. One such field, where intervention of computers is inevitable and making significant progress is “computer vision”, which replicates human vision. In computer vision system, similar to that of an eye, a sensor (a camera) is used to capture the images and different algorithms that usually run on a computer acts as brain for analyzing and understanding features in those captured images. Generally, image is visual representation of information. For better analyzing the information that an image has, many image processing techniques are being used. In real, complete view of an area is always challenging. Here, we are achieving monitoring surroundings of a robot by detecting moving objects from a sequence of panoramic stitched images, which is typically a feature extraction problem in computer vision. By knowing the surrounding environment of a robot, we can enhance its navigation and control. A camera setup, which consists of a single camera or multiple cameras, mounted on the robot is used for acquiring about twenty images, each at an angle of 20 degrees, so as to cover entire 360 degrees Images overlapping with the previous image are stitched to get a single panoramic image. Many of such stitched panoramic images can be created for the same scene at different intervals of time and these complete set of stitched images are then processed at the base station for detecting moving objects over that particular scene. So for analyzing the environment by the images acquired, they have to be transferred to the base station by means of a communication channel. Stitching can be done either at the base station or at the on-site. In the earlier case, we need to transfer all the twenty images per interval to the base station but in the latter we just have to send a single stitched image, which reduces the bandwidth usage. Further, using image c- mpression technique for compressing stitched image enhances the efficient usage of channel bandwidth. More »»


    D. Karthik, Sreenivas, V. N., and Dr. Shanmugha Sundaram G. A., “Optimization of ring parameters of artificial magnetic resonators using Swarm intelligence and Hybrid Genetic Algorithm”, in Electronics Computer Technology (ICECT), 2011 3rd International Conference on, Kanyakumari, 2011, vol. 2, pp. 316-321.[Abstract]

    Proliferation of wireless technology has made Electromagnetic Compatibility an indispensable field of research. The need for efficient system performance in a dynamic electromagnetic environment calls for accurate design of Electromagnetic shielding devices. Artificial magnetic resonators are miniature structures with negative permeability within a specific band. These resonators act as narrowband absorbers at wavelengths in the order of their dimensions. In this paper, the existing equivalent circuit models are discussed for three kinds of magnetic resonators: Multiple Split Ring Resonator, Spiral Resonator, and Labyrinth Resonator. The dependence of the resonant frequency on multiple geometric parameters of the rings is demonstrated. The design parameters of the rings are optimized using Particle Swarm Optimization (PSO) and the proposed Genetic Algorithm - Constrained Nonlinear Optimization Hybrid. These results have been supported by full wave simulations using Ansoft HFSS. More »»


    Sa Prashanth, Dr. Geetha Srikanth, and Dr. Shanmugha Sundaram G. A., “Demand responsive public transportation using wireless technologies”, in ACWR 2011 - Proceedings of the International Conference on Wireless Technologies for Humanitarian Relief, Amritapuri, 2011, pp. 449-453.[Abstract]

    Air pollution has been the bane of society for which we still have not got a satisfying solution. The air pollution due to automobiles constitutes around 60-90% of the total air pollution in the urban area. To curtail this, the mass transportation, bus facilities in particular, in any city has to be fine tuned in such a way that they serve the need of the people. In order to make the whole bus transportation easy and convenient for the public there is a need for optimizing the bus routes based on the destinations of the commuting passengers. In this paper, a demand responsive public transportation scheme is proposed, that also entitles the buses to run without a fixed schedule and adjust the schedules based on the passengers' convenience. On a given map, select places called as the "hot-spots" would serve as the present day bus stop equivalents. These hot-spots will have an appropriate hardware interface for the commuters. Upon suitable activation the passenger is making a request for the bus. This request is sent to a centralized scheduling server which will receive all such requests from various hot-spots, processes them and re-route the nearest bus to the passenger's location. Based on the passenger's destination, a route based on Djiktra's algorithm for least time of transit is generated. The communication between the server and the clients can be achieved though various technologies like GSM, Ethernet or a Wi-Fi enabled network set up. The signal that is sent from the clients to the server will again depend on the chosen network. This will enable the passengers to commute to their destination within a shorter time and in the shortest route possible.

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