分析了CISPR 14-1 Ed 6.0与CISPR 14-1 Ed 5.2的主要技术差异内容,针对结构的调整、范围的变化、限值应用、测试方法等关键点,结合实际案例进行了详细应用解析。并重点分析了30~1 000 MHz辐射骚扰评估的变化对特定产品类别的影响。最后...分析了CISPR 14-1 Ed 6.0与CISPR 14-1 Ed 5.2的主要技术差异内容,针对结构的调整、范围的变化、限值应用、测试方法等关键点,结合实际案例进行了详细应用解析。并重点分析了30~1 000 MHz辐射骚扰评估的变化对特定产品类别的影响。最后浅析了标准今后几个重点的发展趋势。展开更多
The ionospheric effect from solar activity can be seen as the background in the process of detecting the ionospheric precursor prior to strong earthquakes.The ionospheric variation induced by the forthcoming earthquak...The ionospheric effect from solar activity can be seen as the background in the process of detecting the ionospheric precursor prior to strong earthquakes.The ionospheric variation induced by the forthcoming earthquake can be covered by the strong solar background during the period of high solar activity.The issue of how to remove the ionospheric effect from solar radiation is of outstanding significance.In this paper,a method of Empirical Mode Decomposition(EMD) is used to eliminate the solar background.As a case study,the global ionospheric map TEC before the M9.0 Tohoku earthquake on 11 March 2011 is analyzed.After the effect of solar radiation is removed using the EMD method,the precursor of the imminent earthquake is more obvious.The ionospheric anomaly had a local character and only appeared close to the earthquake epicenter while the useful signals were covered by the solar radiation background with traditional method,which implies that the EMD method is effective in eliminating solar radiation background.展开更多
文摘分析了CISPR 14-1 Ed 6.0与CISPR 14-1 Ed 5.2的主要技术差异内容,针对结构的调整、范围的变化、限值应用、测试方法等关键点,结合实际案例进行了详细应用解析。并重点分析了30~1 000 MHz辐射骚扰评估的变化对特定产品类别的影响。最后浅析了标准今后几个重点的发展趋势。
基金Supported by the Seismic Public Welfare Scientific Research Special Appropriation Project of China(201008007)the National Natural Science Foundation of China(41004066)
文摘The ionospheric effect from solar activity can be seen as the background in the process of detecting the ionospheric precursor prior to strong earthquakes.The ionospheric variation induced by the forthcoming earthquake can be covered by the strong solar background during the period of high solar activity.The issue of how to remove the ionospheric effect from solar radiation is of outstanding significance.In this paper,a method of Empirical Mode Decomposition(EMD) is used to eliminate the solar background.As a case study,the global ionospheric map TEC before the M9.0 Tohoku earthquake on 11 March 2011 is analyzed.After the effect of solar radiation is removed using the EMD method,the precursor of the imminent earthquake is more obvious.The ionospheric anomaly had a local character and only appeared close to the earthquake epicenter while the useful signals were covered by the solar radiation background with traditional method,which implies that the EMD method is effective in eliminating solar radiation background.
