Reflectivity maps
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorGary S. Sammelmann
Life of this patent
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Abstract
Systems and methods for embedding three-dimensional targets in realistic sonar images are provided. An actual or synthetic sonar image is first created and a reflectivity map is produced therefrom. A direct path bottom reverberation is calculated to which texture is added by multiplying the signal from a given point on the bottom at coordinates (x,y) by the reflectivity map R(x,y) at that point and in which targets are embedded. Echoes from targets and other noise sources are superimposed on the direct path bottom reverberation to generate raw unbeamformed stave data. The stave data is beamformed to produce the desired complex image with the desired targets naturally embedded therein.
Claims13
A method of training an analyst to identify at least one target embedded in a first sonar image, comprising the steps of:
- providing a computer having a sonar simulation tool installed thereon;
- operatively connecting a human-readable display to said computer;
- providing said first sonar image to said sonar simulation tool on said computer;
- producing a reflectivity map from said first sonar image;
- calculating direct path bottom reverberation;
- superimposing echoes from said at least one target on said direct path bottom reverberation to generate raw stave data;
- beamforming said raw stave data to obtain a second sonar image having said at least one target embedded therein;
- and
- displaying said second sonar image on said display.
A method of training an analyst to identify at least one target embedded in a first sonar image, comprising the steps of:
- providing a computer having a sonar simulation tool installed thereon;
- operatively connecting a human-readable display to said computers;
- creating on said computer a data file of said first sonar image;
- incorporating data for said at least one target into said data file;
- importing said data file into said sonar simulation tool;
- initiating said sonar simulation tool to produce a reflectivity map from said data file;
- activating said sonar simulation tool to image said data file and said reflectivity map to generate raw stave data;
- further activating said sonar simulation tool to beamform said raw stave data to obtain a second sonar image having said at least one target embedded therein;
- and
- displaying said second sonar image on said display.
Dependencies are inferred from the claim text.