00000nam 2200000zi 4500 9.951625 CaOODSP 20250611124547 m o d f cr bn||||||||| 250530e199603##nscd ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre D68-21/51-1996E-PDF Craig, David W. (David William), 1955- author. Computing ship resolution gain for horizontal towed arrays / David W. Craig ; approved by C.W. Bright. Dartmouth, N.S. : National Defence, Research and Development Branch = Défense nationale, Bureau de recherche et développement : Defence Research Establishment Atlantic = Centre de recherches pour la défense Atlantique, March 1996. 1 online resource (iv, 18 pages) : graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier Technical memorandum ; 96/211 Digitized edition from print [produced by Defence Research and Development Canada]. Includes bibliographical references (page 8). "Prediction of sonar performance is an essential step in the design and development of large sonar systems. The sonar equation is most often used to predict detection performance, assuming constant mean values for signal and noise. Unfortunately, this analysis fails to account for changes in mean signal and noise conditions that may vary over hours, days or months. In the case of shipping noise and a horizontal towed array, the mean noise background may vary dramatically as ships move in and out of the main lobe of the beam pattern of a receiver. This report shows that computing probability density functions for actual receiver beam patterns, as well as imposing a constant ambient noise background over individual ship interferers, greatly alters Ship Resolution Gain (SRG) estimates. This is particularly true at low shipping densities, where the difference in SRG estimates may approach 30 dB. Lower SRG estimates are likely more representative of realistic ocean environments"--Abstract, page ii. Includes abstracts in English and French. Underwater acoustics Measurement. Underwater acoustics Computer programs. Acoustique sous-marine Mesure. Acoustique sous-marine Logiciels. Defence Research Establishment Atlantic, issuing body. Canada. Department of National Defence. Research and Development Branch, issuing body. D.R.E.A. technical memorandum ; 96/211. (CaOODSP)9.941838 PDF 970 KB https://publications.gc.ca/collections/collection_2025/rddc-drdc/D68-21-51-1996-eng.pdf