A radar signal processing system utilizing a specialized neural network generative topographic mapping method which employs an alternative method for characterizing multiple radar signatures wherein specialized phased-codes and wavelet waveform modulations are used. The invention comprises three layers each including a plurality of nodes: input layer, mapping layer, and output presentation layer. The input layer takes the collected signals and congregates them into groups of linear data points. The mapping layer provides a method for projecting the data into points of lower dimensions. The data is assumed to arise by first probabilistically picking a point in a low-dimensional space, mapping the point to be observed in high-dimensional input space, then adding noise. The result is a system in which radar data with multiple reflections in close proximity is manipulated into multiple signatures in systematic ways for use in downhole structure signatures.