12 February 1993 Physical reality of radar targets
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Abstract
This leads to three world-views. One is the world of basic symmetry we live in, while the other is applicable to an exotic world where there is a preference for helices with right sense. The other exotic world caters to a world composed of helices with left sense. Hence we have arrived at a unique N-target decomposition which caters to the world of basic symmetry we live in. In this world it is still possible to have helices of any kind, but predominantly the symmetry is preferred, i.e., the N-target which we separate out of the data has no symmetry (ANo equals 0) and is completely non-symmetric (hence the name N-target). Other types of decomposition are based on eigenvalues and eigentargets. These are not transparent in general as to their physical significance. All these physically based arguments lead us to conclude that the N-target decomposition is unique and physically realizable in all cases.
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Jean Richard Huynen, "Physical reality of radar targets", Proc. SPIE 1748, Radar Polarimetry, (12 February 1993); doi: 10.1117/12.140636; https://doi.org/10.1117/12.140636
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