基于ARM Cortex-M3的某新型装备信息采集系统设计

根据某新型装备特点,介绍了一种基于ARM Cortex-M3和SD卡的数据采集系统的硬件设计和软件设计。硬件部分包括信号调理电路、微控制器外围电路和SD卡接口电路三个方面。其中微控制器是基于ARM Cortex-M3微处理器设计的STM32F205VG,本设计采用微控制器自带的ADC模数转换器完成模数转换。软件部分包括系统软件和应用软件两部分,其中系统软件主要有主程序模块、初始化程序模块等;应用软件主要有信息采集、SD卡读写程序等。本系统设计采用ARM微处理器,充分利用了ARM的低功耗、高效率、体积小的优点,具有广泛的应用前景。     

基于ARM Cortex-M3的声磁商品电子防盗系统设计

针对普通EAS系统存在抗干扰性能差、检测灵敏度低、检测范围小、误报率高等缺点,设计了一种基于ARM Cortex-M3的声磁EAS系统。本文介绍了声磁EAS系统的工作原理和硬件结构框图,分析了声磁标签信号在时域和频域上的特征,提出了FFT信号频谱分析、信号互相关、最小二乘法拟合直线求取斜率、计算信号峰值数及峰值方差运算等多种检测声磁标签信号的算法,并详细描述了系统软件算法的设计。实验验证,本系统具有抗干扰性能强、检测灵敏度高、检测范围宽、误报率低等特点。     

基于KW01的无线RFID读卡系统设计

针对以Mifare卡为基础的传统有线RFID系统组网复杂,成本高等问题,采用飞思卡尔2014年最新推向市场的KW01 MCU(集成ARM Cortex-M0+内核与Zigbee Sub-1G无线射频收发器)与射频芯片 MF RC531开发了一套无线RFID读卡系统,以构件化思想设计了系统各模块的硬件电路,封装了KW01与RC531的底层软件驱动构件,并以此为基础给出了结构清晰的工程框架,降低了系统开发的难度,提高了系统的可扩展性与可移植性;同时在软件设计中移植了飞思卡尔SMAC无线精简协议栈实现网络组建,并改进了通信协议与数据收发机制。在433M频率下的测试表明系统节点通信距离远、功耗低、性能稳定,达到了预期要求。     

光载无线通信系统射频信号相移特性研究

测试研制的28GHz光载无线通信系统时发现,经光纤传输后接收端恢复的基带信号眼图会随时间出现张开与闭合的现象,使通信系统的可靠性遭到破坏。通过实验研究和理论分析发现,射频信号的传输时延会随着光纤周围温度的变化而改变,尤其对载波频率较高、传输距离较长的光载无线通信系统的可靠性影响更为严重。为了克服上述相位漂移问题,提出并实验论证了一种基于载波恢复技术的改进型光载无线通信系统,采用二次下变频结构,从中频信号中提取同步时钟,恢复出幅度稳定的原始基带数据。实验系统实现了28GHz载频、1Gb/s数据速率、25km的光纤传输,系统的误码率小于10~(-9)。     

微小型球形飞行器飞行控制系统设计

根据微小型球形飞行器的结构特点和工作原理,设计了一套基于ARM Cortex-M3 STM32F103RBT6微控制器的飞行控制系统,进行了主要模块的功能设计与性能分析,给出了研究结论与选型依据,还设计并完成了姿态传感器两轴转台实验和飞行器室内飞行试验。测试结果表明,该控制系统的姿态传感器姿态测量精度高,能够为飞行控制提供姿态参考信息;飞行器能够圆满实现空中悬停、低空机动等飞行动作,且空中飞行姿态稳定、实时、可靠。该飞行控制系统功能可靠、性能稳定,能够较好地满足微小型球形飞行器的飞行控制要求,具有一定的实用性与扩展性。     

基于STM32F407的高压输电线电磁检测系统设计

针对输电线的结构特点,采用涡流检测与漏磁检测相结合的电磁检测方法,设计了一套以高速ARM微控制器STM32F407VG为控制核心器件的高压输电线电磁检测系统。介绍了系统采用直接数字频率合成DDS技术的涡流激励信号产生模块、采用锁相放大技术的涡流信号提取模块、采用差动测量技术的漏磁检测模块、A/D模数转换模块等。上位机程序采用LabVIEW虚拟仪器设计,并通过USB总线与系统进行实时通信。整个系统具有实时性强、易于集成和重构的特点。     

基于ARM Cortex-M4的构件化汇编框架的研究

规范易用的汇编框架与样例是微处理器深层次应用开发的基础,但汇编编程复杂,并且目前针对32位ARM Cortex-M4的汇编程序资料和样例程序非常匮乏,学习难度大,开发工作困难重重。在深入分析ARM Cortex-M4汇编指令系统和寻址方式的基础上,以NXP半导体公司发布的Kinetis K(KK)系列MCU为蓝本,根据软件工程思想和构件设计理论,提出层次架构的工程框架建模思想,并构建基于ARM Cortex-M4内核的构件化汇编框架,据此制作GPlO驱动构件。指示灯闪烁样例工程的设计及测试结果表明了汇编框架规范、实用、易用,能降低嵌入式汇编语言的学习难度。框架能为业界基于ARM Cortex-M4的汇编开发提供参考。     

基于ARM和nRF905组网的智能家居系统设计

针对家居中电器种类和数目繁多且分散于各室造成控制不便,提出了一种利用nRF905射频模块实现无线通信的智能家居控制系统。系统对射频数据传输协议进行了设计,给出了室内多个微控制器的组网方案。用户通过手机短信或万能遥控器把对家电的控制信号发送至基于ARM平台搭建的主控中心,再由主控中心发送至若干个通信节点或智能插座,万能遥控器通过射频信号实现对家电的近距离遥控,手机通过GSM通信实现对家电的远程遥控。通信节点基于STC89C52RC单片机设计,能够实现对多种红外家电的控制并具备安防报警功能,智能插座则用于控制非遥控家电。实验表明,该系统可使网络中各节点、插座得到有效的控制,数据传输稳定、功能丰富、可扩展性强,具备较高的应用价值。     

用于中性束注入的大功率射频离子源激励器研制

建立了一个等离子体射频激励器,工作气体为氢气,工作气压为0.3Pa,激励器陶瓷桶直径300mm,工作频率1MHz。实现了RF等离子体激发放电,在输入射频功率16kW条件下,采用朗缪尔探针测得的等离子体密度>10¹⁸m^-3,初步建立了一个RF等离子体源实验平台。     

用于冷原子干涉仪激光时序控制的DDS跳频系统设计与实现

为了满足冷原子干涉实验对时序控制的需求,设计并实现了一个基于LABVIEW软件的激光时序控制DDS系统,其工作过程为通过设计的LABVIEW上位机软件输入需要产生的频率和频率间隔时间,ARM芯片根据LABVIEW软件发送来的控制信息实现对射频信号芯片的控制,CPLD芯片用来控制射频信号之间的时间间隔,最后DDS芯片产生与控制信息相对应的射频信号。与目前同类装置相比,系统实现了跳频时间和频率更加精确和工作稳定性更好。经过系统的调试分析以及性能测试,DDS跳频系统能够满足原子干涉仪激光时序控制需求。通过测试DDS装置,DDS装置能够输出准确输出射频频率值,并且射频频率时间间隔能精确到微秒。DDS装置可以有效控制冷原子干涉仪的激光时序,在探询时间为120毫秒且重复率为2.2赫兹的情况下,冷原子重力仪的重力测量灵敏度达到 。     

基于纳米天线的多通道高强度定向表面等离子体波激发

设计了一种带有纳米天线的金属微腔结构, 以实现高强度表面等离子的定向激发. 在利用双狭缝结构实现表面等离子体波定向激发的基础上, 分别结合共振增强和干涉相长原理, 在传统结构的入射端面上添加纳米天线结构, 并增加狭缝通道数, 实现了定向激发的表面等离子体波的能量增强. 基于纳米天线的多通道高强度定向表面等离子体波激发装置结构简单, 系统紧凑, 并能够有效提高定向传播的表面等离子体波的能量密度和传播距离, 其对微纳光学传输和高密度光学集成领域等方面的研究具有重要意义.     

Direct measurement of moment mobility and a moment excitation system

Over the years, a number of investigators have tried to solve the problems in the direct measurement of moment mobility. However, no one has found a moment excitation system that can produce a pure and sufficiently powerful moment. In the past, most investigators tried to solve the problem of impurity in moment by tackling the problem in unmatched shakers in a moment exciter. Su and Gibbs (Su J, Gibbs BM. Measurement of point moment mobility in the presence of non-zero cross mobility. Applied Acoustics 1998;54(1):9-26) have indicated theoretically that compromise between the purity and the power of a moment generated by the moment exciter is greatly affected by the output force impedance of the moment excitation system. In this paper, experiments have been conducted to investigate the effect of output force impedance on direct measurement of moment mobility from which theory of Su and Gibbs has been verified. Methods of improvements of the moment exciter have been proposed in order that the moment exciter can generate a pure and sufficiently powerful moment.     

LHCD系统微波激励源性能优化设计

使用数字锁相环技术实现一定带宽内高精度可调节的频率输出,解决了速调管长期工作后响应频率发生偏移,模拟锁相环无法工作在系统最佳频率的问题;在移相器后增加功率幅度控制电路,保证了线性放大器的输出功率不会受到相位调节的影响;设计了一种基于数模转换(D/A)技术与微波电调技术相结合的波形控制单元,解决了激励源输出波形不可控的问题。通过以上三方面的改进,完成了HL-2M装置LHCD系统微波激励源的性能优化设计。     

The Design of the Microwave Exciter for Klystron

To carry out lower hybrid wave heating and current drive plasma experiment on tokamak, we need mega-watt order of microwave power generated by the parallel-running klystrons. Those klystrons must be driven by the microwave exciter. Now our microwave exciter is used for many years and its performance is decreased very much. It can not satisfy any more the hybrid wave heating and current drive plasma experiment. So we set out to design a new microwave exciter that is consist of the microwave solid components, amplitudestabilization control, modularization design with multitude-outputs, microwave phase control in order to satisfy the demand of the different work in the hybrid wave heating and current drive plasma experiment.     

HL-2Mװ��LHCDϵͳ3.7GHz΢������Դ���

介绍了HL-2M装置低混杂波系统中3.7GHz微波激励源的设计。微波激励源设计为模块化形式,由3.7GHz点频固态源单元、功率分配器单元、功率放大器单元和现场控制器单元等组成。微波激励源有8路输出端口,每个端口的输出功率在0~10W范围内连续可调,并可以实现远程控制输出功率;采用取样鉴相锁相环技术使微波输出信号具有相位噪声低、频率稳定度高、杂散抑制好等优点。频偏1kHz时,相位噪声是-115dBc/Hz,频偏10kHz时,相位噪声是-117dBc/Hz,频偏100kHz时,相位噪声是-122dBc/Hz;输出频率稳定度≤0.03ppm/30min;杂散抑制≤-80dBc。     

Force distortion in resonance testing of structures with electro-dynamic vibration exciters

Harmonic input force distortion which arises when systems are excited with electrodynamic exciters is shown to be predominantly second harmonic, the major source of the harmonic distortion being due to the vibration exciter characteristics. These are examined by experimentally determining the magnetic field strength properties of a typical exciter and the results show these to be a non-linear even function. This information is used with the equations of motion of the excited which are simulated on an analog computer. The computed force characteristics are shown to compare very closely with experimental results. The amount of second harmonic force distortion generated at a system resonance is analyzed by considering a simple single degree-of-freedom model. It is shown that the amount of force distortion is related to the damping of the system under test and the ratio of the exciter stiffness to the system stiffness. It is also shown that the force input to a system near a system resonance can vary considerably, even though the input current to the exciter is constant. These effects are shown to be due to the forces arising from the mass and stiffness characteristics of the exciter being used. Experimental tests on a simple system confirm the theoretical predictions.     

线-铝箔电极电晕放电激励器的推力理论与实验研究

空气电晕放电离子风激励器无需旋转部件, 仅通过消耗电能就能直接产生驱动力, 它是一种新型的动力技术, 备受国内外航空航天界的广泛关注. 目前对空气电晕放电离子风激励器的推力产生机理虽有各种解释, 但是现有理论均不能统一各种条件下的实验结果, 仍需要开展进一步的分析与研究. 本文以线-铝箔电极电晕放电激励器为研究对象, 通过实验研究发现作用在线电极与铝箔电极上的静电力不对称, 而且改变铝箔电极纵向高度和气压均能影响激励器的推力大小; 通过理论分析, 考虑电晕层与空间电荷的影响, 建立了线-铝箔电极电晕放电激励器的推力计算模型, 其计算值与实测值比较一致. 基于上述实验现象与理论建模分析, 本文认为线-铝箔电极电晕放电激励器的推力主要来源于线电极电晕产生的空间电荷对电极系统产生了不对称静电力作用, 使激励器出现净静电力作用.     

小型大功率脉冲半导体激光器的激励器设计

介绍以WMOS管作开关管的小型大功率脉冲半导体激光器的激励器原理,提出模块化激励器的设计观点,并给出实例。     

Sound radiation of panel-form loudspeaker using flat voice coil for excitation

A novel panel-form loudspeaker in which the panel of the speaker is excited by the forces generated through the flat voice coil of a rectangular electro-magnetic type exciter for sound radiation is presented. The exciter when properly designed has the advantage of exerting appropriate loads to the panel so that the major sound pressure level (SPL) dips of the speaker can be suppressed or even eliminated. For designing such panel-form speaker, a method formulated on the basis of the classical plate theory (CPT), Ritz method, and first Rayleigh integral is proposed for predicting the SPL curve of the speaker. An experimental investigation was performed to verify the feasibility of the proposed method. The effects of some system parameters on the major SPL dips of the proposed panel-form speakers are investigated by means of several numerical examples. The optimal locations of flat voice coils for exciting several panel-form speakers are determined to illustrate the important role of excitation location for enhancing sound quality of such speakers via the removal or suppression of the major SPL dips.     

Taming Drift Wave Turbulence

Drift waves in magnetized plasmas often occur in a turbulent form and are often considered as being responsible for anomalous cross‐field particle transport. It is thus very appealing to achieve active control of the drift wave dynamics. A control scheme acting both in space and in time is developed to synchronize drift wave turbulence. It consists of an arrangement of eight electrodes (octupole exciter) in flush‐mounted geometry in the edge region of the magnetized plasma column. The electrodes of the octupole exciter are driven by sinusoidal signals. Between each two neighbouring electrodes, the phase shift of the exciter signal is kept fixed. It is demonstrated experimentally that the exciter signals have strong influence on the different drift wave states, i.e. the turbulent states can be synchronized to a single preselected drift wave mode. The efficiency of the spatiotemporal synchronization is sensitively dependent on both driver frequency and phase shift.