God's Sunflower Array: An Improved Circular Array with better Maximum Sidelobe Level and First Null Beam Width Performance

Author(s): Saumendra Ku. Mohanty*, Biswa B. Mangaraj

Journal Name: International Journal of Sensors, Wireless Communications and Control

Volume 7 , Issue 2 , 2017

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Abstract:

Background & Objective: This paper presents an optimized thinning process (based on density tapering) applied to different circular arrays (CAs) such as circular ring array (CRA), circular concentric array (CCA), circular planar array (CPA) and God's sunflower array (GSFLA). Here, all possible circular arrays are simulated in one platform for better comparison amongst themselves.

Methods: The optimization process we have adopted here are particle swarm optimization (PSO) and cuckoo search (CS) optimization techniques. The performance parameters such as maximum sidelobe level (MSLL) and first null beam width (FNBW) of uniformly excited CAs are compared with optimized non-uniformly excited CAs and optimized thinned CAs. Here, the optimized density tapering thinning process provides much reduced MSLL and improved FNBW.

Results and Conclusion: The simulation results of different thinned CAs exhibit array taper efficiency in the range of 46% - 61%. This further helps in increasing the overall system capacity keeping gain constant for both thinned and non-thinned CAs. The proposed optimized thinned GSFLA outperforms the other arrays in terms of FNBW and MSLL (~ -35 dB).

Keywords: Circular arrays, First null beam width, God’s sunflower array, Maximum sidelobe level, Optimization, Thinning.

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Article Details

VOLUME: 7
ISSUE: 2
Year: 2017
Published on: 16 January, 2018
Page: [138 - 151]
Pages: 14
DOI: 10.2174/2210327907666170621093801
Price: $25

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