本文首先简介OPC(OLE for Process Control)以及它在现场总线设备领域的应用,然后通过研究分析,指出了OPC无法获取现场设备的设备属性、参数语义描述、诊断信息等非控制信息,以及OPC服务器需为遵循不同现场总线的现场设备开发相应驱动...本文首先简介OPC(OLE for Process Control)以及它在现场总线设备领域的应用,然后通过研究分析,指出了OPC无法获取现场设备的设备属性、参数语义描述、诊断信息等非控制信息,以及OPC服务器需为遵循不同现场总线的现场设备开发相应驱动程序等不足,为此,本文引入FDT(Field Tool Device)技术标准,通过建立一个基于OPC与FDT标准的现场设备应用模型,解决了上述问题。展开更多
The principle of uniform DFT filter bank is presented. Exploiting poly-phase structure, radar jamming system samples the intercepted wideband radar signals through analysis filter bank by different channels and linear...The principle of uniform DFT filter bank is presented. Exploiting poly-phase structure, radar jamming system samples the intercepted wideband radar signals through analysis filter bank by different channels and linearly modulates the intercepted radar signal according to the theory of signal and system, then synthesizes the jamming signal through the synthesis filter hank. The method merely requires lower sample frequency, reduces the computational complexity and the data quantity to be processed. The un-ideal filter＇s influence to the result of signals processing is analyzed by simulating the match filter in radar jamming system.展开更多
文摘本文首先简介OPC(OLE for Process Control)以及它在现场总线设备领域的应用,然后通过研究分析,指出了OPC无法获取现场设备的设备属性、参数语义描述、诊断信息等非控制信息,以及OPC服务器需为遵循不同现场总线的现场设备开发相应驱动程序等不足,为此,本文引入FDT(Field Tool Device)技术标准,通过建立一个基于OPC与FDT标准的现场设备应用模型,解决了上述问题。
文摘The principle of uniform DFT filter bank is presented. Exploiting poly-phase structure, radar jamming system samples the intercepted wideband radar signals through analysis filter bank by different channels and linearly modulates the intercepted radar signal according to the theory of signal and system, then synthesizes the jamming signal through the synthesis filter hank. The method merely requires lower sample frequency, reduces the computational complexity and the data quantity to be processed. The un-ideal filter＇s influence to the result of signals processing is analyzed by simulating the match filter in radar jamming system.
