Self-powered chaos signal generator is potentially useful in future medical system,such as low cost portable human healthy monitor and treatment without external power source.For both functional and power unit,the pow...Self-powered chaos signal generator is potentially useful in future medical system,such as low cost portable human healthy monitor and treatment without external power source.For both functional and power unit,the power level of electric energy generator and consumption is a key factor for self-powered system.In this paper,we have investigated the power consumption of three typical output modes of a simple chaos circuit.Analytical analysis for power consumption of fixed output mode is obtained for evaluating the power characteristics of chaos signal generator.Numerical calculations are given for predicting the power characteristics of periodical and chaotic output modes.This study is important for not only understanding the power consumption of chaos signal generator,but also guiding new self-powered chaos signal generator design.展开更多
The main drawback of current ECG systems is the location-specific nature of the systems due to the use of fixed/wired applications. That is why there is a critical need to improve the current ECG systems to achieve ex...The main drawback of current ECG systems is the location-specific nature of the systems due to the use of fixed/wired applications. That is why there is a critical need to improve the current ECG systems to achieve extended patient’s mobility and to cover security handling. With this in mind, Compressed Sensing (CS) procedure and the collaboration of Sensing Matrix Selection (SMS) approach are used to provide a robust ultra-low-power approach for normal and abnormal ECG signals. Our simulation results based on two proposed algorithms illustrate 25% decrease in sampling-rate and a good level of quality for the degree of incoherence between the random measurement and sparsity matrices. The simulation results also confirm that the Binary Toeplitz Matrix (BTM) provides the best compression performance with the highest energy efficiency for random sensing matrix.展开更多
给出了一种基于VPX架构和ADSP-21469的合成孔径雷达(SAR)实时信号处理机的设计与实现。处理机分别采用基于FPGA的交换机和各Lane接收缓冲再同步技术解决板内外数据交换和多Lane Serial RapidI/O同步难点,实现了实时宽带雷达回波中频采...给出了一种基于VPX架构和ADSP-21469的合成孔径雷达(SAR)实时信号处理机的设计与实现。处理机分别采用基于FPGA的交换机和各Lane接收缓冲再同步技术解决板内外数据交换和多Lane Serial RapidI/O同步难点,实现了实时宽带雷达回波中频采样变换和SAR成像处理。测试表明,该信号处理机比相同处理能力的传统处理机至少减少40W功耗,并具有高达1 Gbyte/s的I/O吞吐力。展开更多
针对目前煤矿瓦斯监控系统存在有线布线困难、扩展性差、易破损、抗干扰能力差等问题,采用ZigBee无线传感网络作为数据传输路径,设计了一套可远程无线监控的瓦斯传感系统。硬件上,对终端传感采集节点、ZigBee无线通信网络、传感器信号...针对目前煤矿瓦斯监控系统存在有线布线困难、扩展性差、易破损、抗干扰能力差等问题,采用ZigBee无线传感网络作为数据传输路径,设计了一套可远程无线监控的瓦斯传感系统。硬件上,对终端传感采集节点、ZigBee无线通信网络、传感器信号调理电路、ZigBee模块接口电路进行了设计与设备选型;软件上,对协调器节点通信程序、终端传感采集节点通信程序进行了设计,并最终通过现场测试对整个监控系统的实际应用效果进行了验证。目前该系统已投入使用,系统稳定运行,现场数据表明系统功耗低,节点功耗整体在25 m A以内,通信各项参数也在设定范围之内,具有一定的应用价值。展开更多
基金supported by the Fundamental Research Funds for the Central Universities(Grant No.lzujbky-2013-35)Beijing Municipal Commission of Science and Technology(Grant No.Z131100006013005)
文摘Self-powered chaos signal generator is potentially useful in future medical system,such as low cost portable human healthy monitor and treatment without external power source.For both functional and power unit,the power level of electric energy generator and consumption is a key factor for self-powered system.In this paper,we have investigated the power consumption of three typical output modes of a simple chaos circuit.Analytical analysis for power consumption of fixed output mode is obtained for evaluating the power characteristics of chaos signal generator.Numerical calculations are given for predicting the power characteristics of periodical and chaotic output modes.This study is important for not only understanding the power consumption of chaos signal generator,but also guiding new self-powered chaos signal generator design.
文摘The main drawback of current ECG systems is the location-specific nature of the systems due to the use of fixed/wired applications. That is why there is a critical need to improve the current ECG systems to achieve extended patient’s mobility and to cover security handling. With this in mind, Compressed Sensing (CS) procedure and the collaboration of Sensing Matrix Selection (SMS) approach are used to provide a robust ultra-low-power approach for normal and abnormal ECG signals. Our simulation results based on two proposed algorithms illustrate 25% decrease in sampling-rate and a good level of quality for the degree of incoherence between the random measurement and sparsity matrices. The simulation results also confirm that the Binary Toeplitz Matrix (BTM) provides the best compression performance with the highest energy efficiency for random sensing matrix.
文摘给出了一种基于VPX架构和ADSP-21469的合成孔径雷达(SAR)实时信号处理机的设计与实现。处理机分别采用基于FPGA的交换机和各Lane接收缓冲再同步技术解决板内外数据交换和多Lane Serial RapidI/O同步难点,实现了实时宽带雷达回波中频采样变换和SAR成像处理。测试表明,该信号处理机比相同处理能力的传统处理机至少减少40W功耗,并具有高达1 Gbyte/s的I/O吞吐力。
文摘针对目前煤矿瓦斯监控系统存在有线布线困难、扩展性差、易破损、抗干扰能力差等问题,采用ZigBee无线传感网络作为数据传输路径,设计了一套可远程无线监控的瓦斯传感系统。硬件上,对终端传感采集节点、ZigBee无线通信网络、传感器信号调理电路、ZigBee模块接口电路进行了设计与设备选型;软件上,对协调器节点通信程序、终端传感采集节点通信程序进行了设计,并最终通过现场测试对整个监控系统的实际应用效果进行了验证。目前该系统已投入使用,系统稳定运行,现场数据表明系统功耗低,节点功耗整体在25 m A以内,通信各项参数也在设定范围之内,具有一定的应用价值。
