共查询到19条相似文献,搜索用时 93 毫秒
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随着数据采集系统对速度的要求越来越高,传统的数据采集系统已经不能适应现在的需求。文中主要以FPGA为核心逻辑控制模块的高速数据采集,在设计中采用了自上而下的方法,从而将FPGA的特点划分为几个模块。从该系统从数据采集系统的总结结构,在数据采集系统中主要器件的选择上进行分析,阐述了FPGA在数据采集系统设计中的应用。 相似文献
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刘志斌 《信息技术与信息化》2013,(2):56-58
传统的以MCU为架构的数据采集系统,在用于高速数据采集时往往力不从心,而FPGA以其并行的数据处理方式,可以更好地满足于工程数据的采集。本文结合高速FPGA的特点,设计了一套数据采集系统,应用FPGA的内部逻辑实现时序控制,以FPGA作为采集系统的核心,对采集到的数据通过USB口传输到计算机。该系统具有电路结构简单、功耗低、数据传输方便等优点,可用于电压、电流、温度等参量的采集系统中。 相似文献
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介绍基于FPGA的高速数据采集系统,设计采用Altera公司的FPGA芯片结合AD7787芯片及USB模块芯片。设计系统具有采集速率快、便携性好、功耗小等特点,对基于FPGA数据采集技术的推广具有现实意义。 相似文献
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为了解决射频仿真系统宽带信号采集和处理问题,设计了一种基于FPGA的数据采集系统,系统采用ADC08D1000对宽带信号进行实时采样和转换。该方案采用了模块化设计,设计简单,通用性强,可广泛用于高速系统中的实时数据采集和处理。 相似文献
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The Minimum Variance Distortion less Response (MVDR) beamformer is an attractive alternative to conventional delay and sum (DAS) beamformers in medical ultrasound imaging. However, it is not widely employed in medical ultrasound imaging due to its computational complexity. In this paper, we intend to present a novel broadband MVDR beamformer architecture and its implementation for up to 32 channel ultrasound imaging system. The proposed architecture is based on the subarray MVDR and Dichotomous Coordinate Descent (DCD) iteration based adaptive weight computation. A Field Programmable Gate Array (FPGA) based ultrasound system prototype set up is designed, and the proposed MVDR beamforming Core is emulated on the FPGA. The proposed beamforming core could achieve up to 65.5 fps for a 640 x 480 ultrasound frame. The ultrasound system prototype operates at 20 MHz sampling frequency, and the FPGA implementation resulted in approximately 35% of FPGA resources (Xilinx Kintex-7 410T). Image quality comparisons in terms of Contrast Ration (CR) and Contrast to Noise Ratio (CNR) were performed with MATLAB™ MVDR model ported on the Verasonics™ Vantage-64 ultrasound research platform. 相似文献
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The performance of cellular networks is strongly limited by inter-cell interference. In order to reduce this interference, several techniques have been proposed, e.g., the frequency reuse techniques and distributed antenna system (DAS). This paper investigates the combinations of hard frequency reuse (HFR) and soft frequency reuse (SFR) techniques with DAS in a unique cell architecture, which are called DAS–HFR and DAS–SFR, respectively. This paper analytically quantifies the performance of the downlink multi-cell for DAS–HFR and DAS–SFR in terms of the average spectral efficiency. This also shows, the most appropriate frequency reuse technique depends not only on the average achievable data rate inside the cell, but also on the guaranteed achievable data rate (the minimum achievable data rate which is necessary to be obtained regardless of geographic location). The results show that DAS–SFR improves the achievable data rate of cell edges in a multi-cell environment as compared to a DAS–HFR when frequency reuse factor 1 is utilized. The results also show that DAS–SFR significantly increases the system capacity as compared to the DAS–HFR when frequency reuse factor 3 is utilized. 相似文献
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文章以嵌入式和数据采集技术为基础,研究设计并实现了基于ARM+FPGA体系架构面向高速实时数据采集应用的一种实用新型智能控制器。本文阐述了主处理器ARM最小系统、协处理器FPGA最小系统和ARM与FPGA通信接口等硬件系统技术的实现,以及Linux FPGA字符设备驱动程序开发、协处理器FPGA控制程序和主处理器ARM应用程序设计。智能控制器运用FPGA并行运算处理结构的优势,控制ADC进行高速数据采集。FPGA还可配置成软核处理器-Nios II嵌入式处理器,与ARM构成双核处理器系统。智能控制器通过ARM实现对FPGA的管理控制、实时数据采集和丰富外围接口的通信。 相似文献
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基于ARM和FPGA的微加速度计数据采集系统设计 总被引:3,自引:1,他引:3
基于常用的MEMS惯性器件微型加速度计,介绍一种采用ARM和FPGA架构来采集加速度数值的设计方案,微加速度计的模拟输出信号经A/D芯片转换后由FPGA进行处理和缓存,然后ARM接收FPGA的输出数据并对数据进行显示和存储,对如何用FPGA实现该数据采集系统的传输控制和数据缓存,以及FPGA与A/D转换芯片和ARM的接口设计给出了说明,实现了加速度数值的采集、传输、显示和存储,该方法配置灵活、通用性强,可以较好地移植到相关器件的数据采集系统中。 相似文献
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针对科学数据网格子系统DAS系统2.0版本不能很好地解决海量数据的传输问题,首先分析了DAS2.0版本中所采用的数据传输技术在处理海量数据传输时存在的不足之处,指出了导致出现问题的原因,然后提出了一个集成FTP,HTTP,SOAP,SOCKET等技术的新的数据传输解决方案,阐述了该传输方案中各个模块的设计和在DAS系统新版本中的实现。该传输方案可以有效地解决不同数据量的数据在网格环境下的传输问题,并且提供了多种传输方式供不同类型用户选择使用,具有有效性、易用性和可扩展性等特点。 相似文献
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目前大容量的FPGA多采用BGA封装,当其焊接到电路板上后,引脚连接情况很难检测。本文根据单板上除了FPGA外是否使用其他处理器为依据,将使用了FPGA的单板分为仅有FPGA的单板和包含处理器的单板,根据不同类型单板的特点,给出了FPGA方波输出法和MCU地址数据总线扫描法两种切实可行的检测方法,将这两种方法配合在一起,可以检测出大部分FPGA连接问题。文章还以Altera公司的CycloneIV系列FPGA为例,说明了这些检测方法的实现方式。这些检测方法在单板返修中取得了良好的效果。 相似文献
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Chipalkatti R. Zhang Z. Acampora A.S. 《Selected Areas in Communications, IEEE Journal on》1993,11(4):579-589
The efficiency of protocols coordinating the data transmission between the transmitter and receivers in a network of stations connected using a passive star coupler, equipped with fixed transmitters and tunable receivers, and using wavelength-division multiplexing is discussed. Two reservation-based protocols with varying degrees of signaling complexity are proposed: the dynamic allocation scheme (DAS), which dynamically assigns slots on a packet-by-packet basis, and the hybrid time-division-multiplexing (TDM) scheme (HTDM), which combines the TDM and the DAS scheme and allows both preassigned and dynamic slot assignment. Analytical results are derived for the delay performance of the two schemes and compared with that of TDM. It is shown that the performance of DAS under ideal conditions is close to optimal, but its signaling costs are exorbitantly high. On the other hand, HTDM has lower signaling needs, but has higher delays when compared to DAS 相似文献