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一种机动目标快速ISAR成像方法
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作者 赵凯恒 黄保涛 沈学勇 《空天预警研究学报》 2022年第5期328-333,共6页
针对机动目标ISAR成像常规时频分析算法运算量大、成像效率低的问题,提出一种基于频域阶跃估计和匹配傅里叶变换的快速成像方法.首先在传统的傅里叶域进行线性调频信号参数粗估计,然后再通过匹配傅里叶变换进行准确估计,可大幅减少在时... 针对机动目标ISAR成像常规时频分析算法运算量大、成像效率低的问题,提出一种基于频域阶跃估计和匹配傅里叶变换的快速成像方法.首先在传统的傅里叶域进行线性调频信号参数粗估计,然后再通过匹配傅里叶变换进行准确估计,可大幅减少在时频域坐标空间二维搜索次数.仿真分析表明,该方法提升了计算效率,在保证成像质量的前提下成像效率得到了大幅提高,对机动目标有很好的成像效果. 展开更多
关键词 机动目标 ISAR成像 时频分析 频域阶跃 匹配傅里叶变换
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Spillovers among China’s precious and industrial metals markets:Evidence from higher moments and jumps
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作者 Cai YANG Xiao-jie LEI Bai-sheng SHI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第4期1362-1384,共23页
This study reveals the time-varying spillover effects of higher moments(realized volatility,realized skewness and realized kurtosis)and jumps between China’s precious metals and industrial metals markets.Using 5-min ... This study reveals the time-varying spillover effects of higher moments(realized volatility,realized skewness and realized kurtosis)and jumps between China’s precious metals and industrial metals markets.Using 5-min high-frequency data from May 10,2012 to October 21,2021,the dynamic effects of spillovers are uncovered using the time-frequency domain spillover index framework.The results show that the system connectedness weakens as the moment order gets higher whereas the total jumps connectedness is the smallest,and the spillovers of all estimators are more evident in the short term.The overall information spillovers are time-varying and influenced by major market events.Specifically,for realized volatility,copper is the largest net transmitter and silver is always a net transmitter,while zinc is the largest net receiver.For realized skewness,copper is the largest net transmitter and silver is always a net transmitter,while lead is the largest net receiver.For realized kurtosis and jumps,copper is the largest net transmitter,while aluminum is the largest net receiver.Overall,copper and silver play dominant roles in China’s precious and industrial metals markets system. 展开更多
关键词 SPILLOVERS precious metals industrial metals time-frequency domain analysis higher moments JUMPS
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