Abstract: A system suitable for use in classifying radio signals includes a plurality of feature extractors configured to extract a plurality of features from an object and a plurality of classification layers. Each of the plurality of classification layers includes one or more reduced enhanced Gaussian classifiers selected from a plurality of Gaussian classifiers based on a classification error rate of each of the plurality of Gaussian classifiers and configured to classify the object as belonging to an object class in a subgroup of correctly classified object classes or in a disjoint error subgroup that needs further classification, using at least one of the extracted plurality of features. If the object is classified as belonging to an object class in a disjoint error subgroup at a layer, the object is passed on to a different reduced enhanced Gaussian classifier in a next layer for further classification.