title: Clutter suppression and classification using twin inverted pulse sonar in ship wakes.
abstract: Twin inverted pulse sonar (TWIPS) is here deployed in the wake of a moored rigid inflatable boat (RIB) with propeller turning, and then in the wake of a moving tanker of 4580 dry weight tonnage (the Whitchallenger). This is done first to test its ability to distinguish between scatter from the wake and scatter from the seabed, and second to test its ability to improve detectability of the seabed through the wake, compared to conventional sonar processing techniques. TWIPS does this by distinguishing between linear and nonlinear scatterers and has the further property of distinguishing those nonlinear targets which scatter energy at the even-powered harmonics from those which scatter in the odd-powered harmonics. TWIPS can also, in some manifestations, require no range correction (and therefore does not require the a priori environment knowledge necessary for most remote detection technologies).
authors.affiliation: Institute of Sound and Vibration Research, University of Southampton, Highfield, Southampton SO17 1BJ, UK. tgl@soton.ac.uk
authors.forename: T G
authors.initials: TG
authors.lastname: Leighton
authors.forename: D C
authors.initials: DC
authors.lastname: Finfer
authors.forename: G H
authors.initials: GH
authors.lastname: Chua
authors.forename: P R
authors.initials: PR
authors.lastname: White
authors.forename: J K
authors.initials: JK
authors.lastname: Dix
mesh_terms: D003198:Computer Simulation; D004867:Equipment Design; D019015:Geologic Sediments; D016014:Linear Models; D009038:Motion; D009624:Noise, Transportation; D017711:Nonlinear Dynamics; D009716:Numerical Analysis, Computer-Assisted; D009792:Oceans and Seas; D011312:Pressure; D012542:Scattering, Radiation; D012767:Ships; D012815:Signal Processing, Computer-Assisted; D013018:Sound Spectrography; D013997:Time Factors; D014465:Ultrasonics / Q000295:instrumentation; D014867:Water
chemical_list: D014867:Water