Browsing by Author "Vengadarajan, A."

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    Design of Unimodular Long Length Polyphase Code for CW Radar for Doppler Tolerance
    (Institute of Electrical and Electronics Engineers Inc., 2021) Jena, P.; Vengadarajan, A.; Srihari, P.
    Most of the Continuous Wave (CW) Radars use the FMCW modulation technique to determine the range. In addition, FMCW radar uses periodic sweep for practical implementations. However, there is an increased interest in the design of the CW radar using a suitable waveform of very large Time-Bandwidth (TB) product to overcome some of the perennial problems of CW radars namely, loss due to stretch processing and Range Doppler Coupling. In this work, a modern optimization method is used to design a new class of polyphase waveforms. It includes the design and simulation of uni-modular code based on Cyclic Algorithm New (CAN) algorithms. Further, we have compared CAN-based code with other popular codes such as m-sequence, random phase, and Golomb code based on performance metrics such as Peak Sidelobe Level(PSL), Integrated Sidelobe Level(ISL), and Doppler tolerance. It is found that the CAN can be used to design long length polyphase sequence with better sidelobe performance and Doppler Tolerance. © 2021 IEEE.
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    MIMO Synthetic Impulse and Aperture Radar(SIAR) for Anti-Stealth Applications
    (Institute of Electrical and Electronics Engineers Inc., 2022) Jena, P.; Vengadarajan, A.; Srihari, P.
    Anti-Stealth radar using meter wave frequency such as VHF and UHF is found to be effective against stealth targets. However, meter wave radar suffers from low angular and range resolution which does not meet the detection and tracking performance of modern microwave radar. In this paper, a new class of MIMO radar which is known as Synthetic Impulse Aperture Radar (SIAR) which uses multi-carrier orthogonal waveforms has been studied. The MIMO-SIAR uses Multiple transmitters and Multiple receivers to mitigate the angular and range resolution problem of meter wave radar such as HF, VHF and UHF radar. The study is about the use of SIAR to improve the range and angular resolution using narrow band waveforms from multiple transmitters due to scarcity of continuous gap free frequency band for radiation in meter wave and sparse Tx and Rx arrays to obtain synthetic aperture using the MIMO orthogonality principle for improved angular accuracy. We have studied multi-carrier LFM waveform with de-chirping techniques for spatial domain bandwidth synthesis. From our analysis, it is evident that the MIMO-SIAR will be the solution for anti-stealth applications in meter wave frequency with sufficient resolution in angle and range for surveillance and tracking comparable to microwave radar. © 2022 IEEE.