Holographic map

摘要

A holographic map is formed of one or more holograms or images conforming to the open/closed aperture theorem and grazing angle compensated. A hologram can be thought of as the sum of all images over a range of angles, wherein the frequency and aspect information is coded into two dimensions. An open/closed aperture image is an image having all points in the image observed over the same range of angles. Grazing angle compensation projects the data onto a representation of the sea floor and the image is rescaled by the cosine (or secant) of the angle between a ray connecting the sonar to a point on the sea floor. A valid range of viewing aspects is defined. The images in the holographic map have both a frequency band and range of aspects that, after grazing angle compensation, describe all locations in the map.

主权项

1. A non-transitory computer-readable medium with instructions stored thereon to create a holographic map, comprising:
at least one open/closed aperture theorem conforming image, wherein: an aperture subtends a solid angle with a point located at a distance from said aperture; an amount of radiation from said point incident on substantially each position on said aperture is weighted by a cosine of an angle formed between a position vector from said each position to said point and a vector normal to said aperture at said each position, effective to form said at least one image; said at least one image is grazing angle compensated; and a frequency band and range of aspects of said at least one image describe all locations in said holographic map.