Accession Number : ADA255614


Title :   Advanced Development Active Model: A Users Guide


Descriptive Note : Final rept.


Corporate Author : NAVAL OCEANOGRAPHIC AND ATMOSPHERIC RESEARCH LAB STENNIS SPACE CENTER MS


Personal Author(s) : Fulford, J K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255614.pdf


Report Date : Aug 1992


Pagination or Media Count : 34


Abstract : The Naval Oceanographic and Atmospheric Research Laboratory has developed a numeric model for the prediction of boundary and volume reverberation in shallow-water environments for midfrequency regimes. The model's theoretic foundation is that of the (Naval Research Laboratory) Range Dependent Active System Performance Model. While retaining the theoretic foundation of the NRL model, it was necessary to introduce new algorithms for the computation of the acoustic ray trajectories, and the calculation of the elemental scattering areas used in the prediction of boundary reverberation. The changes were required to implement range-dependent bistatic reverberation and to account for the possibility of strong sound speed gradients in the upper regions of the water column. This technical note serves as a users guide for the Advanced Development Active Model. While the model usually performs without major malfunctions, users should remember that this model is a research and development model.


Descriptors :   *MATHEMATICAL MODELS , *SHALLOW WATER , *ACOUSTIC SCATTERING , *REVERBERATION , VELOCITY , ALGORITHMS , VOLUME , SCATTERING , COMPUTATIONS , SOUND , ACOUSTICS , ATMOSPHERICS , GRADIENTS , TRAJECTORIES , MALFUNCTIONS , NAVAL RESEARCH LABORATORIES , LABORATORIES , NAVAL RESEARCH , ENVIRONMENTS , PREDICTIONS , MODELS , WATER , REGIONS , BOUNDARIES


Subject Categories : Physical and Dynamic Oceanography
      Operations Research
      Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE