THE IDENTIFICATION OF ARBITRARILY SHAPED TARGETS WITH THE SCATTERING MATRIX.
Interim technical rept.,
NAVAL ACADEMY ANNAPOLIS MD DEPT OF ENGINEERING
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It is well known that the shape of a conducting target can be classified according to information derived from polarized, radar backscatter formulated as the scattering matrix. It is shown that the important information about the shape of an arbitrary target is included in five invariant parameters, designated as A, B, C, X, and Y, which are derived from the scattering matrix, and that these parameters are functions of the target yaw and roll angles. As a target follows a particular path in yaw and roll angles. As a target follows a particular path in yaw and roll angles, its trace in five-dimensional, A-B-C-X-Y space is developed, and the complete classification of a target for all aspects is a closed surface in A-B-C-X-Y space. An unknown target is identified by matching its trace for closeness with the known-classification surfaces. The classification and recognition system proposed in this paper makes use of multiple observations of the scattering matrix of the unknown target. Each observation yields a point A, B, C, X, Y that is then mapped in a uniformly spaced, five-dimensional grid to the closest grid intersection. The mapped points are connected and encoded with a vector train and a useful measure of closeness between two vector trains is shown. Author
- Active and Passive Radar Detection and Equipment