Method and apparatus for obtaining the doppler transform of a signal
First Claim
1. A method for obtaining the doppler transform of a one-dimensional signal comprising:
- (a) rearranging said one-dimensional signal in a two-dimensional raster image pattern format; and
(b) producing a plurality of optical linear transforms of said two-dimensional image pattern, said step of producing a plurality of optical linear transforms comprising the steps of optically applying a plurality of horizontal stretches (or contractions) together with a plurality of horizontal shears to the two-dimensional image pattern.
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Abstract
Method and apparatus for obtaining the doppler transform of a one-dimensional linear signal by re-arranging the signal into a two-dimensional raster form image pattern and then obtaining an optical linear transformation of the two-dimensional image. An optical circuit is provided for carrying out the transformation and is designed to process the signal for a large number of doppler levels in rapid succession without it being necessary to rescan the initial signal each time as in the prior art. Accordingly, a substantial reduction in processing time is achieved.
The invention has been developed primarily for use in locating the position of underwater objects through the use of sonar, but has application in a variety of other data processing fields.
10 Citations
12 Claims
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1. A method for obtaining the doppler transform of a one-dimensional signal comprising:
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(a) rearranging said one-dimensional signal in a two-dimensional raster image pattern format; and (b) producing a plurality of optical linear transforms of said two-dimensional image pattern, said step of producing a plurality of optical linear transforms comprising the steps of optically applying a plurality of horizontal stretches (or contractions) together with a plurality of horizontal shears to the two-dimensional image pattern. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for obtaining the doppler transform of a one-dimensional signal comprising:
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(a) means for recording said one-dimensional signal in a two-dimensional raster image pattern format; (b) means for producing a plurality of optical linear transforms of said recorded two-dimensional image, said means for producing said plurality of optical linear transforms comprising optical means for optically applying a plurality of horizontal stretches (or contractions) together with a plurality of horizontal shears to said recorded two-dimensional image; and (c) image receiving means for receiving each of said plurality of optical linear transforms. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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Specification