Target recognition
First Claim
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1. A method of recognising a target, comprising:
- successively sweeping the target with a range-finder to obtain input data representing the return amplitude at different ranges within the target and from different target angles within a bracket of angles;
selecting from the input data those significant ranges at which there is a significantly high amplitude; and
identifying the frequency of occurrence of each of several range differences between pairs of the significant ranges over the bracket of angles, the most common range differences being representative of the distances between major reflectors on the target and thus distinctive of the target.
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Abstract
Apparatus for recognizing a target such as a ship comprises a radar for successively sweeping the target to obtain input data representing the return amplitude from different target angles; a filter for selecting from the input data those significant ranges at which there is a significantly high amplitude; and a range difference compiler for identifying the frequency of occurrence of each of several range differences between pairs of the significant ranges, the most common range differences (expressed as a histogram) being representative of the distances between major reflectors on the target and thus distinctive of the target.
40 Citations
12 Claims
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1. A method of recognising a target, comprising:
- successively sweeping the target with a range-finder to obtain input data representing the return amplitude at different ranges within the target and from different target angles within a bracket of angles;
selecting from the input data those significant ranges at which there is a significantly high amplitude; and
identifying the frequency of occurrence of each of several range differences between pairs of the significant ranges over the bracket of angles, the most common range differences being representative of the distances between major reflectors on the target and thus distinctive of the target. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- successively sweeping the target with a range-finder to obtain input data representing the return amplitude at different ranges within the target and from different target angles within a bracket of angles;
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9. Apparatus for recognising a target, comprising:
- a range-finder for successively sweeping the target to obtain input data representing the return amplitude at different ranges and from different target angles means for selecting from the input data those significant ranges at which there is a significantly high amplitude and means for identifying the frequency of occurrence of each of several range differences between pairs of the significant ranges, the most common range differences being representative of the distances between major reflectors on the target and thus distinctive of the target.
- View Dependent Claims (10, 11)
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12. A method of recognising a target comprising:
- successively sweeping the target with a range-finder to obtain input data representing the return amplitude at different ranges within the target and from different target angles within a bracket of angles;
adjusting the input data to correct for target motion so that the said ranges are defined relative to a selected fixed part of the target;
selecting from the adjusted input data those significant ranges at which there is a significantly high amplitude., and indentifying patterns in the selected data characteristic of the target.
- successively sweeping the target with a range-finder to obtain input data representing the return amplitude at different ranges within the target and from different target angles within a bracket of angles;
Specification