利用FFT方法分析自旋目标RCS变化周期

摘要

This paper proposes an FFT (Fast Fourier Transform) model for analysis of the variation cycle of the RCS(Radar Cross Section) of a spin-stabilized object. Segmented analysis of multiple objects of the same type shows thatthe energy of spin-stabilized objects is concentrated in the low frequency spectrum (below 0. 5Hz) before start ofspin. After start of spin, energy may also be concentrated around some other frequency points besides concentratedenergy in the low frequency spectrum. Quantitative results and applicability conclusions are given for the proposedmodel.%提出了分析自旋稳定目标RCS(雷达反射截面积)变化周期的FFT(快速傅里叶变换)模型,并分段对特定的多个同类型目标做了算例分析,显示出相对其他目标,自旋稳定目标在起旋前频谱能量主要集中在极低频(0.5 Hz以下)；在起旋后,除了在极低频部分有集中的能量,在某些频点附近可能会出现相对比较集中的能量.最后给出了该自旋稳定目标RCS变化周期的量化结果和适用性结论.