基于光谱相似性度量的光谱成像干扰效果定量评估

高卫; 孙奕帆; 孙鹏; 党东妮

doi:doi:10.3788/gzxb20154412.1211001

光子学报, 2015, 44 (12): 1211001, 网络出版: 2015-12-23

基于光谱相似性度量的光谱成像干扰效果定量评估

Quantitative Evaluation of Jamming Effect on Spectral Imaging Based on Spectral Similarity Measure

论文大纲

高卫 ^*孙奕帆孙鹏党东妮

作者单位

北京跟踪与通信技术研究所, 北京 100094

光谱成像干扰效果评估光谱相似性光谱距离伪装 Spectral imaging Evaluation of jamming effect Spectral similarity Spectral distance Camouflage

摘要

利用一种宽波段伪装网和超光谱成像仪进行了光谱成像伪装干扰试验, 基于实施干扰前后光谱图像数据光谱特性的变化, 利用光谱相似性度量指标, 提出了一种用于评估光谱成像干扰效果的光谱距离准则, 结合光谱成像伪装干扰试验结果, 对该准则的适用性进行了验证分析.结果表明, 在试验条件下, 有效伪装区光谱图像像元在伪装前后光谱向量之间的光谱距离可达0.14~0.5, 具体幅值大小因伪装前的目标特性、伪装网层数、超光谱成像仪增益等因素而异, 而非伪装区和无效伪装区光谱图像像元的光谱距离都在0.05以下, 可见在对目标实施有效的伪装干扰前后, 伪装区像元的光谱距离通常会显著大于非伪装区, 而且伪装效果越显著, 光谱距离就越大.因此, 光谱距离可以定量反映干扰对像元光谱特性的影响, 并能鉴别不同干扰效果之间的细微差别, 所以可用于定量、客观评估光谱成像干扰效果.

Abstract

Spectral imaging camouflage jamming tests were carried out with a kind of broad-band camouflage net and a hyperspectral imager. Based on the change of spectral characteristics of the spectral image data after being jammed, a spectral-distance criterion for evaluating jamming effect on spectral imaging was proposed by using spectral similarity measure. The applicability of the criterion was verified and analyzed with the data of the camouflage jamming tests. The results show that, under the test conditions, in the areas those are camouflaged effectively, the spectral distance between the spectral vectors of the image units before and after being camouflaged can reach 0.14~0.5 . The amplitude value varies with the change of the target characteristics before being camouflaged, camouflage net layers and the gain of the hyperspectral imager. On the other hand, the spectral distance of the image units remains below 0.05 in the non-camouflaged areas or the areas those are camouflaged ineffectively. Thus the spectral distance of the image units in camouflaged areas is usually larger than that of the image units in non-camouflaged areas remarkablely when the target is camouflaged effectively. The more remarkable the camouflage effect, the larger the spectral distance. Therefore the spectral distance between the spectral vectors of the image unit before and after being jammed can reflect the jamming effect on the spectral characteristics of the image unit quantitatively, and discriminate small differences in jamming effect on spectral imaging reliably. So the spectral distance could be used as an index for evaluating jamming effect on spectral imaging quantitatively and impersonally.

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高卫, 孙奕帆, 孙鹏, 党东妮. 基于光谱相似性度量的光谱成像干扰效果定量评估[J]. 光子学报, 2015, 44(12): 1211001. GAO Wei, SUN Yi-fan, SUN Peng, DANG Dong-ni. Quantitative Evaluation of Jamming Effect on Spectral Imaging Based on Spectral Similarity Measure[J]. ACTA PHOTONICA SINICA, 2015, 44(12): 1211001.

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