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基于分数阶Fourier变换的水声信道参数估计 被引量:13

Underwater acoustic channel parameter estimation based on fractional Fourier transforms
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摘要 提出基于分数阶Fourier变换(FRFT)对水声信道参数进行估计。分数阶Fourier变换存在相应的最佳分数阶数使给定的chirp信号能量聚集于一最大值,且具有时移、频移特性,使其可适用于存在多途扩展及多普勒频偏的声信道参数估计。通过计算机仿真验证,当存在较大的多普勒频偏时,拷贝相关器将不适用,而FR-FT具有很好的鲁棒性,可估计存在多普勒频偏的多途声信道参数。 The underwater acoustic (UWA) channel parameters are estimated based on the fractional Fourier transform (FRFT). FRFT adapts itself to estimate the parameters of UWA multipath and Doppler shift channel, because of existing an optimal order of FRFT for focusing the energy of the chirp signal and the properties of time shift and frequency shift. The simulations show that fractional Fourier transform is robust for estimating the parameters in the heavy Doppler shift channel when the copy-correlator is not inapplicable, that is significant for active sonar and underwater acoustic communication.
出处 《系统工程与电子技术》 EI CSCD 北大核心 2007年第10期1624-1627,共4页 Systems Engineering and Electronics
基金 哈尔滨工程大学基础研究基金资助课题(HEUFT07073)
关键词 水声多途扩展信道 多普勒频偏 参数估计 分数阶FOURIER变换 underwater acoustic multipath channel Doppler shift parameter estimation fractional Fourier transform
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