Conference Papers

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    Quantized Directional Cosine measurements based Localization
    (Institute of Electrical and Electronics Engineers Inc., 2021) Reddy, B.B.N.; Gunnery, S.; Pardhasaradhi, B.; Srihari, P.
    Localization of target emitters using multiple simultaneous directional cosine (DC) measurements are popular and extremely useful in radar and sonar surveillance systems. Underwater localization, classification, and target tracking using hydrophone with limited bandwidth constraints is a challenging problem. In limited bandwidth applications, quantizing the measurements is an efficient way of representing measurements. The DC measurements are usually in the range of -1 to +1, the quantization of DC leads to inaccuracy in the estimated values. This paper presents the localization problem with quantized DC measurements in densely populated targets scenario. The localization achieved using two different estimation techniques: the least-squares (LS) triangulation and the Quasi newton (QN) method. Further, to explicitly study the quantization effect, we have used linear and optimal quantization techniques to quantize the DC measurements. The performance of the localization is quantified using the position root mean square error (PRMSE). © 2021 IEEE.
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    Numerical Study on Bearing Capacity Estimation of Circular Footing on Sand Reinforced with Sisal Geotextile
    (Springer Science and Business Media Deutschland GmbH, 2025) Jena, S.; Khatri, V.N.; Nainegali, L.
    This paper presents a study on estimating the bearing capacity of shallow circular footings on sand. In this regard, finite element analysis is conducted, assuming that the sand follows Bolton’s model with a relative density of 75%. Initially, the bearing capacity is determined for unreinforced sand conditions, followed by the placement of geotextile at different depths. The results indicate a significant increase in the ultimate bearing capacity of the footing, up to 2.68 times, compared to the unreinforced case, precisely when the geotextile is placed at a depth of 0.25 times the footing diameter. These findings suggest that sisal geotextile can effectively serve as a reinforcement material for addressing various temporary foundation-related problems. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.