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《Journal of Harbin Engineering University》 2002-06
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Digital Computation of Fractional Fourier Transform

ZHAO Yu,CAI Ping,ZHOU Mindong(College of Underwater Acoustic Engineering , Harbin Engineering University,Harbin 150001,China)  
Based on the concept of the fractional fourier transform, its digital computation is given through computer simulation. In terms of linear frequency modulation (LFM) signal, the relation between fractional order and modulation slope is analyzed and the performance comparison with matched filter is given. Moreover, the separation of LFM signal and noise is realized in low signal-to-noise ratio through simulation. Simulation results indicate that the energy of LFM signal will be collected effectively when the fractional order is matching with its modulation slope. In weak signals detection of underwater acoustic domain, we can get high anti-Doppler performance using the Fractional fourier transform algorithm.
【Fund】: 国防科技水声技术重点实验室基金资助项目(00JS23.6.1 CB0182).
【CateGory Index】: O174.2
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