The necessary condition of external oscillations is the existence of closed geodesic lines on the surface of scatterers.
外部振荡存在的必要条件是散射体表面有闭合测地线。
The existence of closed geodesic lines (oscillate loci) is proved. Although there are infinite closed loci on the surface of scatterer, they yield same result in determining SEM poles.
本文给出了闭合测地线，即振荡轨迹的存在性，证明了这种闭合轨迹虽有无穷多条，但就确定SEM极点来说是等价的。
The existence of closed geodesic lines (oscillate loci) is proved. Although there are infinite closed loci on the surface of scatterer, they yield same result in determining SEM poles.
本文给出了闭合测地线，即振荡轨迹的存在性，证明了这种闭合轨迹虽有无穷多条，但就确定SEM极点来说是等价的。
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