Method and apparatus for classifying targets
First Claim
1. Apparatus for cataloging physical objects into one of a plurality of predetermined classes based upon energy received from the object, said apparatus comprising:
- means for receiving the energy from the object;
means connected to said receiving means for generating an object vector based upon a fourth order cumulant function for the received energy;
means for storing class information based upon the fourth order cumulant functions for each of the plurality of predetermined classes; and
means for classifying the object into one of the predetermined classes based upon the class information.
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Accused Products
Abstract
A method and apparatus for classifying objects based upon information conned in the fourth order cumulant derived from energy from the object. Successive pulse returns in active systems and samples in passive systems are converted into vectors based upon the fourth order cumulant information for each successive return or sample. The vectors for each such pulse are compared to corresponding class information based upon the corresponding fourth order cumulant information. The comparison uses loglikelihood ratios of the different pairs of classes. Decision making is based upon the value of each loglikelihood ratio in comparison with a class threshold.
51 Citations
22 Claims
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1. Apparatus for cataloging physical objects into one of a plurality of predetermined classes based upon energy received from the object, said apparatus comprising:
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means for receiving the energy from the object; means connected to said receiving means for generating an object vector based upon a fourth order cumulant function for the received energy; means for storing class information based upon the fourth order cumulant functions for each of the plurality of predetermined classes; and means for classifying the object into one of the predetermined classes based upon the class information. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9)
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3. Apparatus as recited in claim 3 wherein said means for generating the fourth order cumulant object vector operates according to:
- ##EQU13## where s* represents a complex conjugate, and j1 and j2, and j3 are time delays.
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10. Apparatus for classifying a physical object located in a medium into one of a predetermined number of classes, said apparatus comprising:
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means for transmitting at least one energy pulse toward the object; means for receiving an echo from the object in response to a transmitted energy pulse; means connected to said receiving means for processing each received echo to obtain a fourth order cumulant frequency spectrum vector corresponding to the received echo; means for storing information for each of the predetermined number of classes based upon the fourth order cumulant frequency spectrum for each predetermined class; means connected to said processing means and said storing means for classifying each energy pulse into one of three states; and means connected to said pulse classifying means for producing the classification for each object based upon echoes from the object. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method for classifying an object located in a medium into one of a plurality of classes comprising the steps of receiving one of a plurality of energy samples from the object through the medium and for each sample, in succession:
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generating a fourth order cumulant vector corresponding to an energy sample; comparing the fourth order cumulant vector with class information derived from the fourth order cumulant information for each of the classes taken two at a time; testing the result of each comparison for each non-redundant pair of classes to determine pulse classification; and accumulating the testing results for each of the energy samples to classify the object. - View Dependent Claims (19, 20, 21, 22)
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Specification