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《Journal of Applied Acoustics》 2020-02
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An implementation approach of fractional Fourier transform with bandpass sampling in the underwater echoes processing

ZHAN Fei;MA Xiaochuan;WU Yongqing;Key Laboratory of Information Technology for Autonomous Underwater Vehicles, Institute of Acoustics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
Linear frequency modulated(LFM) signal is usually been used for underwater target detection in active sonar system. Fractional Fourier transform(FrFT) method has unique advantage when processing the LFM echos to obtain effective estimations of target parameters in a low SNR or high reverberation environments. A common strategy to improve the range and velocity resolution of active sonar system is to increase time bandwidth product of the transmitted signal. Then the computation complexity of method increases dramatically, especially the FrFT-based data processing method with Nyquist sampling. As a result, the method can hardly meet the real-time requirements of unmanned underwater vehicle(UUV) with constraints on the volume and power consumption. To address the problem, we proposed an approach to implement the FrFT method with band-pass sampling. By modifying the projection of time-frequency characteristic line of LFM signal on fractional domain, correct estimations of target parameters can be obtain by using FrFT method to process echo data with band-pass sampling. The processing results for simulation data and experimental data of UUV demonstrate the validity of the method, and the corresponding data processing time can meet the real-time requirements of UUV.
【Fund】: 国家自然科学基金项目(61531018)
【CateGory Index】: TB566
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