Browsing by Author "Bergem, Oddbjorn"
Now showing items 1-8 of 8
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An approach to robust map generation from multibeam bathymetric data
Canepa, Gaetano; Bergem, Oddbjorn (NATO. SACLANTCEN, 1997/10)During the last twenty years, many multibeam bathymetric sonars have been produced. The instrumentation is usually accompanied by a system able to produce a seafloor map from the sonar data. There are also several public ... -
Analysis of broad-band echosounder data over a gassy seabed
Boyle, Frank A.; Chotiros, Nicholas P.; Pace, Nicholas G.; Bergem, Oddbjorn; Pouliquen, Eric (NATO. SACLANTCEN, 1997)Calibrated echosoundings from a well-characterized gassy seabed were examined. Acoustic reflection was significantly higher than expected. It is hypothesized that gas bubbles are responsible. Anomalously high levels of ... -
Comparison of a time domain spectral collocation method and the time-evolution backscatter model BORIS
Bergem, Oddbjorn; Jenserud, T. (NATO. SACLANTCEN, 1997/11)A model based on the time-domain spectral collocation method has been implemented at Forsvarets -
High frequency acoustics in shallow water: proceedings of a conference held in Lerici, Italy, 30 June to 4 July, 1997, organized and sponsored by the NATO SACLANT Undersea Research Centre
High frequency acoustics in shallow water (1997 June 30 - July 4 : Lerici, Italy) (NATO. SACLANTCEN, 1997) -
Seabed characterization by inversion of parametric sonar data: selection of the cost function
Caiti, Andrea; Bergem, Oddbjorn; Pouliquen, Eric; Biancheri, A.; Scaricacciotoli, S. (NATO. SACLANTCEN, 1997)A class of possible cost functions to be used in model-based estimation of bottom parameters from highfrequency backscatter signals is introduced. The cost is based on the properttes of the signal in the wavelettransformed ... -
The effect source movements on shallow water bottom backscatter
Bergem, Oddbjorn; Pouliquen, Eric; Pace, Nicholas G. (NATO. SACLANTCEN, 1997)The time-evolution model BORIS is used to study the effects of source movements on bottom backscatter. Changes in the backscattend time domain signals as functions of source depth, position and incident angles are simulated ... -
Time-evolution modelling of seafloor scatter: Part 1: Theory
Pouliquen, Eric; Bergem, Oddbjorn; Pace, Nicholas G. (NATO. SACLANTCEN, 1997/04)A time-series model for acoustic seafloor backscattering is described. -
Time-evolution modelling of seafloor scatter: Part 2: experimental verification
Bergem, Oddbjorn; Pouliquen, Eric; Canepa, Gaetano; Pace, Nicholas G. (NATO. SACLANTCEN, 1997/04)A time-evolution model of seafloor scatter is numerically implemented and experimentally verified. The model is based on expressing analytically the elementary time-backscattered response of every seafloor surface and every ...