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

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DSTO-GD-02154. ConclusionsThe current version of the ABCS program has manual checking for the start andend points of the echo sounder returns. The first returns are normally found correctlyafter one three point smoothing of the raw data, but are sometimes successfully foundwith no smoothing. The second return is normally not found, due to a low signal tonoise ratio of this return, caused by the Echo Listener currently being used (see 3.4Problems found from Analysing Test Data). This problem can either be fixed or thesecond return ignored. The first return has enough data to determine the acousticbottom classification, since QTC uses only the first return in its classification.When the digitised echo sounder signal has a higher dynamic range or it is decidedto ignore the second return, raw data should be obtained at a number of sites where thesediment type is known. This data can then be used to refine the ABCS program, sothat the finding of the returns can be totally automated, without the need to check ifthe returns were found correctly. Also a format for the statistical data produced can bedecided and the analysis of these statistics begun.5. ReferencesD.R Burns, C.B. Queen, H. Sisk, W. Mullarkey, and R.C. Chivers (1989)Rapid and convenient acoustic sea-bed discrimination for fisheries applications.Proceedings of the Institute of Acoustics, 11, Part 3, 169-178D. Cato, G. Steward, A. Jones, C. Norwood, S. Taylor, J. Riley, D. Liebing, A. Madry, R.Wilkinson, and I. Jones (1995)Basics of Under Water Acoustics. Course notes. Acoustics and Vibration CentreUniversity of New South Wales and Australian Defence Force Academy.(Unpublished).D. A. Caughey and R. L. Kirlin (1996)Blind Deconvolution of Echo Sounder Envelopes, Presented ICASS 96. 1996International Conference on Acoustics, Speech and Signal Processing, page 3150. May7-10. 1996. Marriott Marquis Hotel, Atlanta, Georgia. Institute of Electrical andElectronics Engineers Signal Processing Society.D. Caughey, B. Prager, and J. Klymak (1994)Sea Bottom Classification from Echo Sounding Data. Contractor's Report 94-56.Document number SC93-019-FR-001. Quester Tangent Corporation, MarineTechnology Centre, 99-9865 West Saanich Road, Sidney, British Columbia, V8L 3S1.35pp20
DSTO-GD-0215R.E. Francois and G.R. Garrison (1982)Sound absorption based on ocean measurements: Part I: Pure water and magnesiumsulfate contributions. J. Acoust. Soc. Am. 72(3), 896-907S.L. Grossman (1984)Calculus. Third edition. International edition. Academic Press Inc.G.J.Heald and N. G. Pace (1996)An Analysis of 1 st and 2 nd Backscatter for Seabed classification. To be published in the3 rd European Conference on Underwater Acoustics.Higginbottom I. (1999)Personal correspondence with L. Hamilton 29 June 1999.X. Lurton and E. Pouliquen (1992)Automated Sea-Bed Classification System for Echo Sounders. Laboratoired’Acoustique Sous-Marine, IFREMER, Centre de BREST, BP 70, 29820 PLOUZANE,FRANCE, IEEE Oceans 1992 Conference Proceedings , 317-321B.T. Prager, D.A. Caughey, and R.H. Poeckert (1995)Bottom classification: operational results from QTC View. " OCEANS' 95 - Challengesof our Changing Global Environment " Conference, San Diego, California, USA.October 1995.J. G. Proakis and D. G. Manolakis (1989)Introduction to digital signal processing. MacMillan Publishing Company. New York.M.R. Spiegel (1972)Theory and Problems of Statistics. SI metric edition. Schaums Outline Series. McGraw-Hill Book Company. 359pp.21
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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: DSTO-GD-02153.4 Problems found from
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 and 48: DSTO-GD-0215Appendix 5: Search Area
Page 49 and 50: DISTRIBUTION LISTThe ABCS Program f
Page 51: Page classification: UNCLASSIFIEDDE

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