@article{oai:niigata-u.repo.nii.ac.jp:00001818,
 author = {Yang, Jian and Peng, Ying-Ning and Yamaguchi, Yoshio and Yamada, Hiroyoshi and Boerner, Wolfgang-Martin},
 issue = {2},
 journal = {IEICE transactions on communications, IEICE transactions on communications},
 month = {Feb},
 note = {The periodicity of a target scattering matrix is studied when the target is rotated about the sight line of a monostatic radar. Except for the periodicity and invariance of the scattering matrix diag(a, a), it is proved that only helixes have the quasi-invariance, and that only N-targets have the quasi-periodicity, demonstrating that a target with some angle rotation symmetry also has the scattering matrix form diag(a, a). From this result, we conclude that it is impossible to extract the shape characteristics of a complex target from its scattering matrix or its Kennaugh matrix.},
 pages = {565--567},
 title = {The Periodicity of the Scattering Matrix and Its Application},
 volume = {E85-B},
 year = {2002}
}