The ABCS Program for the Analysis of Echo Sounder Returns for ...

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DSTO-GD-0215The end of the returns are looked for next, and are searched for in the reverseorder. With these points the times searched depends on whether the second start pointwas found. If the second start point was found, the end of the first return is searchedfor between the two start points, and the end of the second return is searched from theend of the samples for the ping to the start of the second return. If the start of thesecond return is not found, the end of the first return is searched for from the end ofthe ping samples to the start of the first return, with no search for the second returnend.The background noise level is also calculated using the start time, this value istaken as an average of the points between the 80 th sample and 0.9* the start time of thefirst return. The average is not taken from the first sample due to a ringing in the echosounder appearing in the first few samples.42
DISTRIBUTION LISTThe ABCS Program for the Analysis of Echo Sounder Returns for Acoustic BottomClassificationPaul A. Clarke and L. J. HamiltonDEFENCE ORGANISATIONAUSTRALIATask Sponsor: MWSCPD, CP 2 - 2 - 19, Campbell Park, Canberra, ACT, 2600S&T ProgramChief Defence Scientist⎫FAS Science Policy⎬ shared copyAS Science Corporate Management ⎭Director General Science Policy DevelopmentCounsellor Defence Science, London (Doc Data Sheet )Counsellor Defence Science, Washington (Doc Data Sheet )Scientific Adviser to MRDC Thailand (Doc Data Sheet )Scientific Adviser Policy and CommandNavy Scientific AdviserScientific Adviser - Army (Doc Data Sheet and distribution list only)Air Force Scientific AdviserDirector TrialsAeronautical and Maritime Research LaboratoryDirectorChief of Maritime Operations DivisionResearch Leader: Dr A. TheobaldHead: Dr D.H. CatoTask Manager: Dr P.J. MulhearnAuthors: Mr P. Clarke (5 copies)Mr L.J. Hamilton (5 copies)Dr A.D. Jones, AMRL SalisburyDSTO LibraryLibrary Fishermens BendLibrary MaribyrnongLibrary Salisbury (2 copies)Australian ArchivesLibrary, MOD, Pyrmont (2 copies)Library, MOD, HMAS Stirling*US Defence Technical Information Center, 2 copies*UK Defence Research Information Centre, 2 copies*Canada Defence Scientific Information Service, 1 copy*NZ Defence Information Centre, 1 copy
Page 1 and 2: The ABCS Program for the Analysis o
Page 3: The ABCS Program for the Analysis o
Page 7 and 8: DSTO-GD-02151. IntroductionThe type
Page 9 and 10: DSTO-GD-02153.1 Depth Normalisation
Page 11 and 12: DSTO-GD-0215By combining these two
Page 13 and 14: DSTO-GD-02153.1.3 Effect of Transfo
Page 15 and 16: DSTO-GD-0215If a longer ping durati
Page 17 and 18: DSTO-GD-0215SamplingRate =2 × Soun
Page 19 and 20: DSTO-GD-0215If a return is not foun
Page 21 and 22: DSTO-GD-0215The FFT plot was calcul
Page 23 and 24: DSTO-GD-0215Figure 10 : Statistics
Page 25 and 26: DSTO-GD-02153.4 Problems found from
Page 27 and 28: DSTO-GD-0215R.E. Francois and G.R.
Page 29 and 30: DSTO-GD-0215Appendix 1: Returned Pi
Page 31 and 32: DSTO-GD-0215Therefore the time take
Page 33 and 34: DSTO-GD-0215Appendix 2: Geometric E
Page 35 and 36: DSTO-GD-0215Appendix 3: The ‘Leve
Page 37 and 38: DSTO-GD-02151st input2nd inputRetur
Page 39 and 40: DSTO-GD-0215Appendix 4: Calculation
Page 41 and 42: DSTO-GD-0215Substituting y=µSinω
Page 43 and 44: DSTO-GD-0215dB P= Sinθeq(21)dθ2Th
Page 45 and 46: DSTO-GD-0215Calculating the Insonif
Page 47: DSTO-GD-0215Appendix 5: Search Area
Page 51: Page classification: UNCLASSIFIEDDE

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