Electronics and Radar Development Establishment

Bangalore, India

Electronics and Radar Development Establishment

Bangalore, India

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Saroj Kumar G.,Electronics and Radar Development Establishment | Ghosh R.,Jadavpur University | Ghose D.,Indian Institute of Science | Vengadarajan A.,Defence Research and Development Organization
Journal of Guidance, Control, and Dynamics | Year: 2017

In this paper, an integrated estimation/guidance algorithm that combines Kalman-filter-based interactive multiple-model estimators with a modified differential game guidance law is developed for seekerless interceptors in three-dimensional space. The target is assumed to perform various types of maneuvers, while the sensor has noisy measurements and the interceptor is subject to acceleration bound. To handle these, the Kalman filters used in the interactive multiple model are pretuned using two recently developed metrics based on innovation covariance. To determine the filter tuning parameters, the metrics are evaluated offline for the Kalman filter using different process models, and the tuned values of the process noise covariance are selected in each case. These tuned Kalman filters are then used in the interactive multiple-model configuration to cater to various maneuvers that are expected during the end game. A numerical study compares the performances of these, and a previously reported interactive multiplemodel technique demonstrates significant improvements in performance. © 2016 by Aaron Estes and Manoranjan Majji.

Yadav R.,Electronics and Radar Development Establishment | Varma S.,Indian Institute of Information Technology Allahabad | Malaviya N.,Institute of Engineering and Technology
IEEE Sensors Journal | Year: 2010

In this work, we carried out the performance analysis of Optimized Medium Access Control (MAC) Protocol for the wireless sensor network. This MAC protocol solves the energy inefficiency taking nodes latency into consideration based on the network traffic. It achieves high-energy efficiency under wide range of traffic loads and is able to adjust itself to improve the delay performance when the network traffic load is high. © 2006 IEEE.

Dyana A.,Electronics and Radar Development Establishment | Srinivas Rao C.H.,Electronics and Radar Development Establishment | Kuloor R.,Electronics and Radar Development Establishment
2012 14th International Conference on Ground Penetrating Radar, GPR 2012 | Year: 2012

In this paper, we propose a 3D image analysis method for landmine detection from vehicle mounted Ground Penetrating Radar (GPR) data, using adaptive filtering technique and image segmentation algorithm. Conventional methods for landmine detection seldom exploit the 3D information (C-Scan) and the discrimination algorithms used are computationally expensive. In our method, we have used 3D adaptive filtering technique (3D LMS), which is suitable for real-time applications for locating the anomalies in C-Scan data. Gradient Vector Flow Deformable Model based segmentation algorithm is applied on the localized regions to obtain a 3D volumetric segmented image. The segmented regions' shape features are used to further discriminate targets from clutters to obtain a 3D segmented image of landmines. Data collected from 3D Radar system and Vector Network Analyzer (VNA) based SFCW-GPR is used for performance evaluation of the proposed algorithm. Our proposed method has shown better performance than other state-of-the-art algorithms for landmine detection, in terms of its Receiver Operating Characteristic (ROC) measure. ©2012 IEEE.

Kumar D.,Electronics and Radar Development Establishment | Deb D.,Electronics and Radar Development Establishment | Mamgain R.,Electronics and Radar Development Establishment
2015 IEEE Radar Conference - Proceedings | Year: 2015

Radar signal processing requires platform with high number crunching capability for a real time performance. Towards this, multiprocessor based architectures plays a significant role in achieving real time processing speed for voluminous radar data. Also, different radar signal processing algorithms are amenable to partition in either data or algorithm domain to achieve execution speedup. In this paper, we intend to analyze different multiprocessor based architectures quantitatively for performance metrics and analytical relationship between performance metrics like load imbalance and efficiency of multiprocessor platforms are also brought out. Depending upon particular radar application, these performance metrics are taken into account before deciding the architecture. The case study for different architectures for their efficiency is also carried out. © 2015 IEEE.

Singh D.K.,Electronics and Radar Development Establishment | Pande D.C.,Electronics and Radar Development Establishment | Bhattacharya A.,Indian Institute of Technology Kharagpur
Progress In Electromagnetics Research C | Year: 2012

Equivalent charge method is used to design ultra wide band asymptotic conical dipole (ACD) antenna. Combination of linear charge density and point charges is used to generate different profiles for ACD antennas. Two different profiles of ACD antenna are used as a feed for reflector based impulse-radiating antennas (IRAs). This paper focuses on the selection of ideal ACD profile as well as the requisite charge distribution for ACD antenna as a feed to design 100 Ω input impedance reflector IRA. An ideal Configuration of ACD feeding structure for reflector IRA is chosen based on FDTD analysis results. To validate the utility of the proposed new feed an ACD-fed half IRA is realized with input impedance of nearly 50 Ω. Measurements are carried out using single-ended instrumentation without any impedance adaptor as commonly done with Conventional IRAs. © 2010 EMW Publishing.

Deb D.,Electronics and Radar Development Establishment
IETE Journal of Research | Year: 2010

In this paper, an adaptive modulation and beam-forming strategy for orthogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) systems with rate-limited feedback is presented. It utilizes the correlation between OFDM subcarriers to reduce the amount of feedback of channel states from a receiver to a transmitter. An expression for the correlation coefficient between the squared gains of channel taps of the OFDM subcarrier for a Rayleigh fading channel with uniform and exponential multipath profile is derived. The performance of the proposed feedback strategy is compared with the one proposed.

Manikandan S.,Electronics and Radar Development Establishment | Vardhini J.P.,Electronics and Radar Development Establishment
Sensing and Imaging | Year: 2014

In airborne synthetic aperture radar (SAR), there was a major problem encountered in the area of image mosaic in the absence of platform information and sensor information (geocoding), when SAR is applied in large-scale scene and the platform faces large changes. In order to enhance real-time performance and robustness of image mosaic, enhancement based Speeded-Up Robust Features (SURF) mosaic method for airborne SAR is proposed in this paper. SURF is a novel scale-invariant and rotation-invariant feature. It is perfect in its high computation, speed and robustness. In this paper, When the SAR image is acquired, initially the image is enhanced by using local statistic techniques and SURF is applied for SAR image matching accord to its characteristic, and then acquires its invariant feature for matching. In the process of image matching, the nearest neighbor rule for initial matching is used, and the wrong points of the matches are removed through RANSAC fitting algorithm. The proposed algorithm is implemented in different SAR images with difference in scale change, rotation change and noise. The proposed algorithm is compared with other existing algorithms and the quantitative and qualitative measures are calculated and tabulated. The proposed algorithm is robust to changes and the threshold is varied accordingly to increase the matching rate more than 95 %. © 2015, Springer Science+Business Media New York.

Singh D.K.,Electronics and Radar Development Establishment | Mohan N.,CMR Institute of Technology | Pande D.C.,Electronics and Radar Development Establishment | Bhattacharya A.,Indian Institute of Technology Kharagpur
IEEE Transactions on Antennas and Propagation | Year: 2014

Target scattered time domain response in the resonance region can be modelled by natural poles using the singularity expansion method (SEM). A hybrid of the conventional Extinction pulse (E-Pulse) and auto-regressive (AR) method is proposed in this communication for robust discrimination of radar targets. A new target discrimination number (TDN) is suggested, which gives enhanced discrimination margin for the decision process. The limitation of the conventional E-pulse method is highlighted using time domain responses of metallic cylinders of different radii obtained through simulations. The hybrid E-pulse technique is applied to scatterers in free space as well as under the surface and demonstrated to produce comfortable discrimination margins. © 2014 IEEE.

Singh D.K.,Electronics and Radar Development Establishment | Pande D.C.,Electronics and Radar Development Establishment
Ultra-Wideband, Short Pulse Electromagnetics 9 | Year: 2010

Impulse response of an ultra-wideband antenna needs to be determined to completely characterize it. Hence, knowledge of the input to the antenna and its response to the same along with a technique to relate them with the impulse response needs to be devised. Deconvolving the input and the output signals gives the impulse response of the system. A solution to the deconvolution problem is presented using an iterative method, wherein the iteration is applied over discrete data in time domain. Given the input and the measured output from an asymptotic conical monopole, which is an ultra-wideband system, a method is shown to determine the impulse response of the monopole. The uniqueness of the estimate of the impulse response is sensitive to the nature of the errors in input and output data acquired. Here, conjugate gradient method is employed to estimate the impulse response of the monopole antenna. © Springer Science+Business Media, LLC 2010.

Kumar P.,Electronics and Radar Development Establishment | Singh A.K.,Electronics and Radar Development Establishment
Indian Journal of Radio and Space Physics | Year: 2013

The present paper describes the phase only pattern synthesis for the active phased array antenna using genetic algorithm. The phase only synthesis is required to broaden and shape thebeam in transmit mode of operation where all elements are fed through the saturated power of transmit/receive modules (TRM). This technique is very useful in multifunctional radar application where broadened beam can occupy more search volume (reduction in frame time). The real coded genetic algorithm (GA), which has ability to find solution of complex problems, has been exploited to get the required shaping of the beam. GA based software is a high performance optimizer and is very easy to understand and implement.

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