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A Fast Partial Frequency Spectrum Computation Method for the Efficient Frequency-Domain Beamformer  

Ha, Chang-Eup (School of Electrical Engineering, Pusan National University)
Kim, Wan-Jin (School of Electrical Engineering, Pusan National University)
Lee, Dong-Hun (Agency for Defense Development)
Kim, Hyoung-Nam (School of Electrical Engineering, Pusan National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.48, no.4, 2011 , pp. 160-168 More about this Journal
Abstract
A Frequency domain beamforming technique is widely used in sonar systems with a large number of beams and sensors. In the battlefield environment requiring real-time signal processing, it is needed to optimize the computational complexity of the spectrum computation to implement an efficient and fast frequency domain beamformer. So, in this paper, we proposed the pruned-GSFFT (pruned generalized sliding fast Fourier transform) as a new spectrum computation method. The proposed method help to reduce the computational complexity of the real-time partial spectrum computation by eliminating the redundancy between consecutive input samples and skipping the regardless frequency bands. Also the characteristics of the proposed pruned-GSFFT method and its computational complexity are compared to those of previous FFT algorithms.
Keywords
SONAR; frequency domain beamformer; FFT; computational complexity;
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