http://www.ir.juit.ac.in:8080/jspui/jspui/handle/123456789/16 2026-04-24T20:52:05Z 2026-04-24T20:52:05Z Thakur, Ankur Talluri, Salman Raju Saini, Davinder Singh http://www.ir.juit.ac.in:8080/jspui/jspui/handle/123456789/4713 2022-07-21T05:20:26Z 2017-01-01T00:00:00Z

Title: Signal Generation Employing Chebyshev Polynomial For Pulse Compression With Small Relative Side-Lobe Level Authors: Thakur, Ankur; Talluri, Salman Raju; Saini, Davinder Singh Abstract: The theme of this paper is to present the improvement in the peak side-lobe levels (PSL) and timebandwidth product with Chebyshev polynomial. This PSL behavior is observed by the matched filter (MF) response, which contains main-lobe width as well as side-lobes. Here to get a better reduction in the side-lobes, Chebyshev polynomials are modified by using zero-crossing there by getting the positive and negative pulse. Here two cases have been considered, in first ordinary Chebyshev polynomial are analyzed, second is a modification in the cycles of Chebyshev polynomial is incorporated. After this the smallest duration of the pulse has been used in determining the optimal duration which has the smallest mean square error (MSE) between the number of pulses incorporated and original signal. This is giving a much larger signal with less PSL by reducing the search domain considerably. This new method tries to implement a side lobe level reduction technique. All of the mentioned procedure is carried out by mathematical equations a nd simulation verification. Description: 2017 IEEE 3rd International Conference on Sensing, Signal Processing and Security (ICSSS)

2017-01-01T00:00:00Z Talluri, Salman Raju http://www.ir.juit.ac.in:8080/jspui/jspui/handle/123456789/4712 2022-07-21T05:18:26Z 2018-01-01T00:00:00Z

Title: Envelope Modification of the Hyperbolic Frequency Modulated Signal with LC-Filters in order to have a Better Range Resolution in Radar Systems Authors: Talluri, Salman Raju Abstract: The theme of this paper is to realize a continuous time domain window similar to the Hamming window. Windowing is used in signal processing to smooth the spectral content and for reducing the spectral leakage as well. Long time duration windows with narrow spectral content can provide much better smoothing compared with short duration windows with broad spectral content. The other advantage of the windowing in the time domain is the reduction of sidelobe levels in the output of the matched filter (MF). In radar systems which use the MF, this reduction in the relative sidelobe level improves the resolution of the system. Radar systems use the hyperbolic frequency modulated (HFM) signals to have the better range and velocity resolutions since these waveforms are Doppler invariant. To further improve the range resolution, the envelope of the HFM signal has been modified using a continuous time domain Hamming window and its Doppler invariant property has been observed. In order to realize the practical circuit that implements the analogous continuous time domain Hamming window for the HFM signal, Butterworth notch filter, and Butterworth highpass filters (HPF) has been considered and it is observed that HPF is approximating the characteristics of the Hamming window. Description: International Conference on Communication and Signal Processing, April 3-5, 2018, India. 978-1-5386-3521-6/18/$31.00 ©2018 IEEE

2018-01-01T00:00:00Z Thakur, Ankur Talluri, Salman Raju http://www.ir.juit.ac.in:8080/jspui/jspui/handle/123456789/4711 2022-07-21T05:16:18Z 2017-01-01T00:00:00Z

Title: A Novel Pulse Compression Technique For Side-Lobe Reduction Using Woo Filter Concepts Authors: Thakur, Ankur; Talluri, Salman Raju Abstract: The theme of this paper is to present a novel technique for the reduction of the side-lobes in the pulse compression (PC) for the radar systems. The peak sidelobe level (PSL), integrated sidelobe level (ISL) and relative main-lobe width are computed using P4 polyphase codes, and compared the proposed technique results with other PC techniques such as Woo filter as well as modified Woo filter. This proposed PC technique is implemented by shifting the input P4 polyphase codes and multiplied it with reference signal in the frequency domain, after that the side-lobe behavior is analyzed by converting it into the time domain. Results show that the method introduced in this paper produces certain improvement in PSL and ISL. Description: 978-1-5090-3800-8/17/$31.00 ©2017 IEEE

2017-01-01T00:00:00Z Bharti, Bandna Barman, P. B. Rajesh Kumar http://www.ir.juit.ac.in:8080/jspui/jspui/handle/123456789/4710 2022-07-21T05:14:26Z 2015-01-01T00:00:00Z

Title: XRD analysis of undoped and Fe doped TiO2 nanoparticles by Williamson Hall Method Authors: Bharti, Bandna; Barman, P. B.; Rajesh Kumar Abstract: Undoped and Fe doped titanium dioxide (TiO2) nanoparticles were synthesized by sol-gel method at room temperature. The synthesized samples were annealed at 500oC. For structural analysis, the prepared samples were characterized by X-ray diffraction (XRD). The crystallite size of TiO2 and Fe doped TiO2 nanoparticles were calculated by Scherer’s formula, and was found to be 15 nm and 11 nm, respectively. Reduction in crystallite size of TiO2 with Fe doping was observed. The anatase phase of Fe-doped TiO2 nanoparticles was also confirmed by X-ray diffraction. By using Williamson-Hall method, lattice strain and crystallite size were also calculated. Williamson–Hall plot indicates the presence of compressive strain for TiO2 and tensile strain for Fe-TiO2 nanoparticles annealed at 500oC. Description: Advanced Materials and Radiation Physics (AMRP-2015) AIP Conf. Proc. 1675, 030025-1–030025-4; doi: 10.1063/1.4929241 © 2015 AIP Publishing LLC 978-0-7354-1322-1/$30.00

2015-01-01T00:00:00Z