title: Improved space time prewhitener for linear frequency modulation reverberation using fractional Fourier transform.
abstract: This letter presents an improved space time prewhitening method for linear frequency modulation (LFM) reverberation. The proposed method transforms the reverberation to fractional Fourier domain to whiten using fractional Fourier transform. The linear varying frequency in LFM reverberation is focused on a stationary frequency, and the adjacent block signal is used as the reference signal of prewhitening. Finally, experiment results with real reverberation data verify that the proposed method improves the detection performance of active sonar in shallow sea significantly.
authors.affiliation: College of Marine Engineering, Northwestern Polytechnical University, Xi'an 710072, China. wangruhang@mail.nwpu.edu.cn
authors.forename: Ruhang
authors.initials: R
authors.lastname: Wang
authors.forename: Jianguo
authors.initials: J
authors.lastname: Huang
authors.forename: Tian
authors.initials: T
authors.lastname: Ma
authors.forename: Qunfei
authors.initials: Q
authors.lastname: Zhang
mesh_terms: D000162:Acoustics; D004301:Doppler Effect; D005583:Fourier Analysis; D016014:Linear Models; D009038:Motion; D011825:Radar; D012623:Seawater; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013018:Sound Spectrography; D013997:Time Factors; D014732:Vibration