虚拟多核数据采集技术的研究和应用
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摘要
提出了一种主要通过软件来拓宽数据采集仪动态范围的新方法——虚拟多核数据采集技术。本方法利用1个A/D,对同一个输入信号进行多路连续扫描采集;然后由软件按照一定的规则对所采集到的数据再进行2次重采样,达到拓宽动态范围的目的。相比多核数据采集方法,本方法主要由软件来间接提高A/D的分辨率,具有成本低、可修改性强等优点;相比单核数据采集仪,本方法可使采集仪在高采样率工作时也能得到高的分辨率和大的动态范围。实验仿真结果表明本方法理论上是可行的。基于此方法和16位A/D芯片开发出了虚拟3核数据采集仪。其噪声和实际动态范围测试结果表明虚拟多核数据采集技术在实际应用中也是可行的。
A new way to widen the dynamic range of DAQ software is proposed,called virtual multiple cores DAQ technology.In this way,one A/D is used to work in scanning to pick the same signal by multiple channels. Secondly,according to a rule software pick twice again from the data which is transformed by the same A/ D.The dynamic range of A/D is widening after three picking.Comparing with multiple cores DAQ technology, this way mainly wides the dynamic range of A/D by software,therefore,it has low cost,easy to change and other advantages;comparing with common DAQ,multiple virtual cores DAQ not only has high picking rate,but also has widely dynamic range.Simulation results show that this theory is feasible.According this theory and using 16 bit A/D,one virtual 3 cores DAQ is given.The test result of noise and dynamic range of this DAQ show that virtual multiple cores DAQ technology also is possible in practical application.
A new way to widen the dynamic range of DAQ software is proposed,called virtual multiple cores DAQ technology.In this way,one A/D is used to work in scanning to pick the same signal by multiple channels. Secondly,according to a rule software pick twice again from the data which is transformed by the same A/ D.The dynamic range of A/D is widening after three picking.Comparing with multiple cores DAQ technology, this way mainly wides the dynamic range of A/D by software,therefore,it has low cost,easy to change and other advantages;comparing with common DAQ,multiple virtual cores DAQ not only has high picking rate,but also has widely dynamic range.Simulation results show that this theory is feasible.According this theory and using 16 bit A/D,one virtual 3 cores DAQ is given.The test result of noise and dynamic range of this DAQ show that virtual multiple cores DAQ technology also is possible in practical application.
引文
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[7]阎振华,黄建国,何成兵.阵列多通道同步采集系统与多处理器结构的数据采集方法实现[J].测控技术,2007,26 (9):23-25.
[8]罗福龙.地震数据采集系统综述和展望[J].中国石油勘探,2007,12(2):67-70.
[2]吴邦春,彭晓彤,周怀阳,等.基于海底观测网的深海化学监测系统的设计[J].仪器仪表学报,2011,32(5).
[3]刘少真,孔祥成,裴国玺,等.基于ARM的数据采集系统并行总线的驱动设计[J].核电子学与探测技术,2011,31 (4):399-402.
[4]孙苗钟,谈炳发,崔世海,等.基于Delphi连续大容量数据采集与处理的编程实现[J].测控技术,2010,29(10).
[5]胡金华,袁湘辉,张卫,等.LabVIEW中数据采集系统的开发应用[J].仪表技术,2008(7):21-23.
[6]杨理践,于潇宇,高松巍.基于FPGA的海量数据采集系统的设计[J].测控技术,2009,28(5):38-40.
[7]阎振华,黄建国,何成兵.阵列多通道同步采集系统与多处理器结构的数据采集方法实现[J].测控技术,2007,26 (9):23-25.
[8]罗福龙.地震数据采集系统综述和展望[J].中国石油勘探,2007,12(2):67-70.
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