Ponte Academic Journal Jan 2017, Volume 73, Issue 1 |
HQECMT: HEX QUADRATIC RESIDUE EX-OR CODED MATRIX TECHNIQUE TO IMPROVE TARGET DETECTION IN DOPPLER TOLERANT RADARS Author(s): Syed Jalal Ahmed ,R. K. Singh, D. Elizabath Rani J. Ponte - Jan 2017 - Volume 73 - Issue 1 doi: 10.21506/j.ponte.2017.1.3 Abstract: Radars have taken the guided weapon systems to new heights in detection, guidance and speed measurements. Expertise in the field of electromagnetism, radar signal processing and coding techniques have improved the target detection probability and resolution uniqueness of the contemporary radar systems both in terms of range and Doppler. However, effect of side lobes still exists which hampers the probability of detection of target as the weak echoes from the small targets may be masked by the side lobes of big slow moving targets. The key role of this paper is an exertion to present an extensive approach of detecting multiple moving targets at various ranges in presence of Doppler. High-resolution radar signal waveforms are presented using Hex Quadratic residue, EX-OR Coded Matrix Technique (HQECMT), which improves detection of moving target probability in multi target environments. The technique uses windowing approach, in which at certain ranges of Doppler frequencies the range side lobes are drastically low and the detection of moving targets becomes very easy at these Doppler frequencies for entire radar range. The targets can be viewed on Doppler Vs delay plot from the ambiguity function, choosing the Doppler frequency under consideration. We also validate our approach using MATLAB. The side lobes are clear for a major range of Doppler given by real time slow and fast moving targets like Tanks, APCs, helicopters, aircrafts, fighter aircrafts, missiles and ICBM
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