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Performance in the Primary and Secondary Processing of Pulsed Radio Signals in Passive Radar Systems
Simulation has been applied to observing, radio parameter estimating, and identifying electronic devices to estimate the performance in primary and secondary signal processing in passive radar systems for various forms of receiving and analyzing equipment. 相似文献
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汽车运行信息智能传感器测试系统是一种包含机械、电子和信息技术的高科技产品.对驾驶员超速、超载、疲劳驾驶的违章行为进行自动记录与报警的智能控制系统,在现代化的交通控制和管理中起着很重要的作用. 相似文献
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利用计算机及数模、模数转换技术,在原有的永磁材料自动控制测量系统基础上,将磁通、磁场两个物理量溯源到电压V、时间t、长度m三个基本物理量,实现测量系统高精度的自我校准。 相似文献
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The systematic error is considered in measuring the normal component of the magnetic induction at the pole surfaces of a permanent magnet in the display of the magnetic field distribution by means of a film sensor based on a bismuth-bearing ferrite-garnet. A criterion is proposed for selecting film structures for use in magnetooptic detectors. 相似文献
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磁浮列车气隙磁场的测量可以为列车电磁系统的设计和控制提供重要依据.本文对气隙测量系统中磁传感器运动控制平台的设计进行了详细介绍,阐述了运动控制平台的工作原理和光栅尺信号的处理方法.采用双计数器鉴相法消除了光栅尺抖动的影响,提高了传感器的定位精度.同时采用电流矢量恒幅旋转的细分方法实现了步进电机恒转矩均匀细分控制,提高了步进电机的分辨率和运行稳定性.所设计的运动控制平台的定位精度可以达到1μm. 相似文献
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Measurement Techniques - The present paper discusses the problem of distortions in speech signals transmitted over a communication channel to a biometric system during voice-based remote... 相似文献
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跌落方位是跌落冲击中的一个重要参数,测量较为困难,提出了一种基于电容传感器的跌落方位现场测试新方案,分析了其基本结构、测量电路、测试原理和方法. 相似文献
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针对激光加工的特定工艺要求,在对空间自由曲面测量系统分析的基础上,论述了测量系统研究的实际意义,进行了总体方案设计研究。内容包括:测头选择,系统控制方案设计,测试方案设计,数据处理方案设计等. 相似文献
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The slotting of electrical rotating machines creates slot harmonics of the air-gap magnetic flux density. These slot harmonics are the source of a nonnegligible part of the unbalanced magnetic pull (UMP). This paper presents analytical justifications for the use of a numerical impulse method to calculate the effects of the slot harmonics on the UMP. It uses the method to show that the force components due to the slot harmonics cannot be reduced easily. 相似文献
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针对钻井泵振动测试过程中遇到的工频干扰,采用信号的基元分段方法进行测试信号的合理分段处理,结合最优频率匹配法实现分段后干扰信号的建模分析。在此基础上提出振动信号的匹配滤波法,实现干扰信号与钻井泵振动信号的匹配滤波分离。实践表明,最优频率匹配法可以实现各种信号的数学建模,是一种通用性的信号建模处理有效的新方法,而且建立在该方法基础上的匹配滤波法也可以较为完整、合理地分离各种时、频域混叠信号,是一种适应性强的信号滤波处理新方法。 相似文献
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A. Roque S. Ramos J. Barão M. Machado D. M. Sousa E. Margato J. Maia 《Journal of Superconductivity and Novel Magnetism》2013,26(1):133-140
This paper is a contribution for the assessment and comparison of magnet properties based on magnetic field characteristics particularly concerning the magnetic induction uniformity in the air gaps. For this aim, a solver was developed and implemented to determine the magnetic field of a magnetic core to be used in Fast Field Cycling (FFC) Nuclear Magnetic Resonance (NMR) relaxometry. The electromagnetic field computation is based on a 2D finite-element method (FEM) using both the scalar and the vector potential formulation. Results for the magnetic field lines and the magnetic induction vector in the air gap are presented. The target magnetic induction is 0.2 T, which is a typical requirement of the FFC NMR technique, which can be achieved with a magnetic core based on permanent magnets or coils. In addition, this application requires high magnetic induction uniformity. To achieve this goal, a solution including superconducting pieces is analyzed. Results are compared with a different FEM program. 相似文献