A number of fractal/multifractal methods are introduced for quantifying the mineral deposit spectrum which include a number-size model, grade-tonnage model, power spectrum model, multifractal model and an eigenvalue s...A number of fractal/multifractal methods are introduced for quantifying the mineral deposit spectrum which include a number-size model, grade-tonnage model, power spectrum model, multifractal model and an eigenvalue spectrum model. The first two models characterize mineral deposits spectra based on relationships among the measures of mineral deposits. These include the number of deposits, size of deposits, concentration and volume of mineral deposits. The last three methods that deal with the spatial-temporal spectra of mineral deposit studies are all expected to be popularized in near future. A case study of hydrothermal gold deposits from the Abitibi area, a world-class mineral district, is used to demonstrate the principle as well as the applications of methods proposed in this paper. It has been shown that fractal and multifractal models are generally applicable to modeling of mineral deposits and occurrences. Clusters of mineral deposits were identified by several methods including the power spectral analysis, singularity analysis and the eigenvalue analysis. These clusters contain most of the known mineral deposits in the Timmins and Kirkland Lake camps.展开更多
认知跳频被认为是消除传统跳频系统用频困扰的有效途径之一。针对认知跳频超宽带和多频隙实时频谱感知的需求,给出基于归一化谱双向搜索(bidirectional search of normalized power-spectrum,BSNP)的感知算法,BSNP以跳频频隙内的归一化...认知跳频被认为是消除传统跳频系统用频困扰的有效途径之一。针对认知跳频超宽带和多频隙实时频谱感知的需求,给出基于归一化谱双向搜索(bidirectional search of normalized power-spectrum,BSNP)的感知算法,BSNP以跳频频隙内的归一化功率谱作为检验统计量,通过顺序执行正向和反向搜索,感知出跳频带宽中已被占用的所有频隙。利用傅里叶变换的渐进正态性和相互独立性,可推导BSNP单次判决虚警概率的数学表达式和判决门限的闭式表达式。分析和仿真表明,BSNP可以准确地找出频带内被占用的频隙,相比于常规谱估计感知算法,可有效克服噪声不确定度对频谱感知性能的影响。展开更多
文摘A number of fractal/multifractal methods are introduced for quantifying the mineral deposit spectrum which include a number-size model, grade-tonnage model, power spectrum model, multifractal model and an eigenvalue spectrum model. The first two models characterize mineral deposits spectra based on relationships among the measures of mineral deposits. These include the number of deposits, size of deposits, concentration and volume of mineral deposits. The last three methods that deal with the spatial-temporal spectra of mineral deposit studies are all expected to be popularized in near future. A case study of hydrothermal gold deposits from the Abitibi area, a world-class mineral district, is used to demonstrate the principle as well as the applications of methods proposed in this paper. It has been shown that fractal and multifractal models are generally applicable to modeling of mineral deposits and occurrences. Clusters of mineral deposits were identified by several methods including the power spectral analysis, singularity analysis and the eigenvalue analysis. These clusters contain most of the known mineral deposits in the Timmins and Kirkland Lake camps.
文摘认知跳频被认为是消除传统跳频系统用频困扰的有效途径之一。针对认知跳频超宽带和多频隙实时频谱感知的需求,给出基于归一化谱双向搜索(bidirectional search of normalized power-spectrum,BSNP)的感知算法,BSNP以跳频频隙内的归一化功率谱作为检验统计量,通过顺序执行正向和反向搜索,感知出跳频带宽中已被占用的所有频隙。利用傅里叶变换的渐进正态性和相互独立性,可推导BSNP单次判决虚警概率的数学表达式和判决门限的闭式表达式。分析和仿真表明,BSNP可以准确地找出频带内被占用的频隙,相比于常规谱估计感知算法,可有效克服噪声不确定度对频谱感知性能的影响。
