针对地空三分量电磁探测对接收信号高速、同步、大量存储、同时记录线圈姿态信息的需求,提出了带有高精度同步姿态测量的全波形地空电磁探测数字接收系统。设计了针对地空电磁法的模拟信号调理电路,通过两片同步驱动的高速24位AD芯片实...针对地空三分量电磁探测对接收信号高速、同步、大量存储、同时记录线圈姿态信息的需求,提出了带有高精度同步姿态测量的全波形地空电磁探测数字接收系统。设计了针对地空电磁法的模拟信号调理电路,通过两片同步驱动的高速24位AD芯片实现三通道高速采样,由FPGA实现了大量数据的实时传输。设计了同步姿态测量装置,可实时同步存储线圈姿态数据。实测结果表示,该数字采集系统能满足三个通道全速192 k Hz的采样率采集电磁数据、以100 Hz的采样率得到同步的线圈姿态数据,并通过实地野外实验证明了该系统可以完成含姿态测量的地空电磁三分量数据采集工作。展开更多
Data from high-resolution satellites were used to evaluate the spatial and temporal distribution of mesoscale convective vortices(MCVs) in central and east China and the western Pacific Ocean region. The monthly varia...Data from high-resolution satellites were used to evaluate the spatial and temporal distribution of mesoscale convective vortices(MCVs) in central and east China and the western Pacific Ocean region. The monthly variation in MCVs was significant. From May to October, MCVs were clearly affected by large-scale environmental conditions,including the South Asian summer monsoon, subtropical high and solar radiation, which resulted in clear changes in MCV spatial distributions from strengthening and weakening processes. Based on the analysis of diurnal MCV variations and the precipitation rate from May to October, MCVs were found to occur more frequently over the ocean than over land. MCVs near the Sea of Japan and northern South China Sea occurred during all types of weather. Ocean occurrences near land, such as the Ryukyu Islands, were categorized as morning-active MCVs. The hilly regions of southeastern China and North China Plain were characterized by afternoon-active MCVs. Limited to topography and the urban heat island effect, the Beijing-Tianjin-Tangshan area had evening-active MCVs, while Changbai Mountain had nocturnal MCVs.展开更多
文摘针对地空三分量电磁探测对接收信号高速、同步、大量存储、同时记录线圈姿态信息的需求,提出了带有高精度同步姿态测量的全波形地空电磁探测数字接收系统。设计了针对地空电磁法的模拟信号调理电路,通过两片同步驱动的高速24位AD芯片实现三通道高速采样,由FPGA实现了大量数据的实时传输。设计了同步姿态测量装置,可实时同步存储线圈姿态数据。实测结果表示,该数字采集系统能满足三个通道全速192 k Hz的采样率采集电磁数据、以100 Hz的采样率得到同步的线圈姿态数据,并通过实地野外实验证明了该系统可以完成含姿态测量的地空电磁三分量数据采集工作。
基金Special Program for Basic Research of Science and Technology of China(GYHY201106035)Key Project of Zhejiang Meteorological Bureau(2017ZD16)Special Program of State Grid(SGZJ0000KJJS1600445)
文摘Data from high-resolution satellites were used to evaluate the spatial and temporal distribution of mesoscale convective vortices(MCVs) in central and east China and the western Pacific Ocean region. The monthly variation in MCVs was significant. From May to October, MCVs were clearly affected by large-scale environmental conditions,including the South Asian summer monsoon, subtropical high and solar radiation, which resulted in clear changes in MCV spatial distributions from strengthening and weakening processes. Based on the analysis of diurnal MCV variations and the precipitation rate from May to October, MCVs were found to occur more frequently over the ocean than over land. MCVs near the Sea of Japan and northern South China Sea occurred during all types of weather. Ocean occurrences near land, such as the Ryukyu Islands, were categorized as morning-active MCVs. The hilly regions of southeastern China and North China Plain were characterized by afternoon-active MCVs. Limited to topography and the urban heat island effect, the Beijing-Tianjin-Tangshan area had evening-active MCVs, while Changbai Mountain had nocturnal MCVs.
