Performance Enhancement of Active Sonar System in Under Water Environment Using Spherical Hydrophone Array

Rahaman, Imteaz; Hossain, Md. Selim; Hossain, Md. Yousuf; Hosen, Nadim

doi:10.1109/icaee48663.2019.8975427

Cited by 4 publications

(2 citation statements)

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“…A triangular function which is equal to zero at the variation of ring number M + 1 is the main criterion in triangular tapering technique. The coefficients of the ring amplitude for this scheme are calculated by using equation (16).…”

Section: ) Triangular Amplitude Taperingmentioning

confidence: 99%

“…Moreover, the phase-only beamformer performs well as a direction of arrival (DOA) estimator at low SNR in terms of additive homoscedastic and heteroscedastic Gaussian noise [15]. Apart from this, a spherical hydrophone array improves the SNR for underwater beamforming [16]. Convex optimization and a deterministic approach are proposed as hybrid methods for sparse concentric ring arrays which can optimize both SLL and first null beamwidth(FNBW) [17].…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of Linearly arranged Concentric Circular Antenna Array with Low Sidelobe Level and Beamwidth Using Robust Tapering Technique.

Rahaman

Reza

Hossain

et al. 2021

Preprint

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In this research, a novel antenna array named Linearly arranged Concentric Circular Antenna Array (LCCAA) is proposed concerning lower beamwidth, lower sidelobe level, sharp ability to detect the false signal, and impressive SINR performance. The performance of the proposed LCCAA beamformer is compared with geometrically identical existing beamformers using the conventional technique where the LCCAA beamformer shows the lowest beamwidth and sidelobe level(SLL) of 12.50°and -15.17 dB in equal element accordingly. However, the performance gets degraded due to looking direction error, and robust techniques- fixed diagonal loading (FDL), optimal diagonal loading (ODL), and variable diagonal loading (VDL) are applied to all the potential arrays to minimize this problem. Furthermore, the LCCAA beamformer is further simulated to reduce the sidelobe applying tapering techniques where the hamming window shows the best performance having 17.097 dB less sidelobe level compared to the uniform window. The proposed structure is also analyzed under a robust tapered (VDL-hamming) method which reduces around 69.92 dB and 48.39 dB more sidelobe level compared to conventional and robust techniques. Analyzing all the performances, it is clear that the proposed LCCAA beamformer is superior and provides the best performance with the proposed robust tapered (VDL-hamming) technique.

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Section: ) Triangular Amplitude Taperingmentioning

confidence: 99%