广域电磁接收机中ARM系统的应用

在多通道广域电磁接收机中,高性能嵌入式系统的应用,将有利于提高其智能化控制水平,更好地满足勘探中在功耗、信号处理能力和实时响应能力等方面的要求。本文在分析嵌入式系统及微处理器的基础上,选取了美国德州仪器公司生产的嵌入式ARM Cortex－A8微处理器AM3517作为硬件核心,阐述了AM3517处理器的基本工作原理和ARM嵌入式系统硬件平台的设计方法,结合广域电磁法的应用需求,设计了基于AM3517的核心主控电路。应用Cadence专业电子设计软件,详细解析了硬件平台设计过程,所设计平台配置了存储系统及外围硬件等模块,完成了核心系统的硬件电路原理图和PCB板设计。同时基于硬件平台,完成了Linux软件系统的移植以及主要模块的调试,经测试表明该ARM系统应用在广域电磁接收机中以实现主控功能是可行的。     

广域电磁接收机中基于ARM的主控电路设计

在多通道广域电磁接收机中,高性能嵌入式系统的应用,将有利于提高其智能化控制水平,更好地满足资源野外勘探中在功耗、信号处理能力和实时响应能力等方面的要求.文章在分析嵌入式系统和嵌入式处理器的基础上,选取了德州仪器高性能嵌入式ARM Cortex-A8微处理器AM3517作为核心,阐述了AM3517处理器的基本工作原理和ARM嵌入式系统硬件的设计方法,结合广域电磁法的应用需求,设计了基于AM3517的核心主控电路.使用ORCAD高性能电子设计软件,详细解析了硬件平台设计过程,所设计的平台配置了存储系统及外围硬件等设备,完成了整个核心系统的硬件电路原理图和PCB板设计.     

An EMD based method for detrending RR interval series without resampling

Slow trends in the RR interval(RRI) series should be removed in the preprocessing step to get a reliable result of heart rate variability(HRV) analysis. Re-sampling is required to convert the unevenly sampled RRI series into evenly sampled time series when using the widely accepted smoothness priors approach(SPA). Noise is introduced in this process and the information quality is thus compromised. Empirical mode decomposition(EMD) and its variants, were introduced to directly process the unevenly sampled RRI series. Besides, a RR interval model was proposed to fascinate the introduction of standard metrics for the evaluation of the detrending performance. Based on standard metrics including signal-to-noise-ratio in d B(ISNR), mean square error(EMS), and percent root square difference(DPRS), the effectiveness of detrending methods in RR interval analysis were determined. Results demonstrate that complementary ensemble EMD(CEEMD, a variant of EMD) based method has a higher ISNR, a lower EMS and a lower DPRS as well as a better RRI series detrending performance compared with the SPA method, which would in turn lead to a more accurate HRV analysis.     

E-E_φ广域视电阻率定义的改进方法及场特性识别

广域电磁法采用均匀大地表面水平电偶源的全区精确表达式定义广域视电阻率,与卡尼亚视电阻率相比,能更好地反映地电模型的电性特征。利用广域视电阻率定义方法定义了E Eφ方式的广域视电阻率、远区视电阻率及近区视电阻率,考虑观测方位角的影响,同时得出了E Eφ观测装置的装置系数和电磁响应函数。对3层介质的A型、Q型、K型和H型的一维正演计算分析表明:E Eφ观测装置的广域电磁法的观测方位角的影响相当于φ=90°时观测坐标系的旋转,通过适当的校正,任意φ角的测深曲线更能真实地反映地电断面随深度的客观变化,综合3种不同视电阻率的分析,能够较好地识别人工源频率域测深中电磁场不同的渐近特性。基于E Eφ方式的广域电磁法扩大了观测范围,具有更好的应用前景。