北斗机载接收机射频敏感度测试

RTCA/DO-160G射频敏感度测试已广泛用于民用航空机载设备的可靠性检定中,然而,目前国内外对基于DO-160G的北斗机载接收机射频敏感度测试的理论分析与实际测试并不多见,对RTCA/DO-160G射频敏感度测试的研究旨在为民用北斗机载接收机的射频敏感度测试提供理论参考和实践依据.文中首先导出了传导敏感度及辐射敏感度校准的理论模型并验证了其有效性,导出模型表明选择满足标准要求的注入探头比高功率放大器的选择更重要,同时得到了远场条件下天线输入功率的估算方法.其次提出了基于敏感概率的半电波暗室与混响室辐射敏感度测试的等效模型,理论及实验结果表明该模型能够较好地预测两种测试方法的差异.最后根据所需的测试信号建立了相应的敏感度评估模型,实际得到的辐射敏感度测试下连续波和脉冲调制阈值最小值为5 V/m、40 V/m,表明接收机对脉冲干扰的耐受性显著高于连续波.     

采用混响室的军用电源辐射敏感度测试分析

阐述利用混响室进行军用电源的辐射敏感度试验布置及方法。对比分析了混响室法和电波暗室法(RS103)的军用电源辐射敏感度试验结果。在两种场地下得到的敏感度测试现象不同,基于该现象分析了混响室法辐射敏感度试验的应用特点。     

PLC电力猫的EMI测试方法

目前国内没有针对PLC电力猫的EMC测试标准,如果按照信息技术设备类标准将无法通过认证测试。结合欧洲PLC产品标准,对PLC电力猫的EMI测试和环境搭建问题进行系统性分析。辐射测试时,给出了场地方面的调整措施,以保证辐射测试顺利通过;针对传导测试的四个项目:测试非对称传导骚扰(电源部分)、动态功率控制、认知频率排除、非对称传导骚扰(信号部分),结合测试连接图,对限值及注意事项等进行了分析。     

电源电子设备的电磁兼容分析

阐述电子设备和电源的兼容特点,实验与改进方案,包括电源线的传导发射实验、电场辐射敏感度测试,从而满足规定的电磁兼容设计需求,并通过电磁兼容性试验的验证。     

国内外机载设备电磁环境验证标准分析

RTCA／DO-160G和GJB151A／152A-97都涉及了电磁环境验证,高强度辐射场（HIRF）试验是重点的验证项目,比较分析这两个标准对该项目在测试条件、测试对象及测试方法的差异,得出对于飞机机载设备的传导敏感度和辐射敏感度的试验,采用GJB151A／152A可能会出现要求过高的情况,而采用RTCA／DO-160G则更加方便灵活。     

EMC测试中的电流注入技术

文章综述了在系统电磁兼容性(EMC)测试中替代直接辐照的电流注入技术的最新研究成果。电流注入技术主要有两种：大电流注入(BCI)和直接电流注入(DCI)。BCI技术主要用于辐射敏感度测试，尤其是测试电缆束对射频耦合的敏感度。DCI技术是一种用在高场强辐射场(HIRF)下系统级EMC安全裕度测试的新技术，研究的热点是其相对自由场辐照的有效性及等效关系。     

比较NEBS与CE认证中的EMC要求

在CE认证的基础上,从EMC方面介绍分析NEBS要求(按Level3级)与其区别,以便改进现有设计并在产品中考虑到NEBS需求,更好地满足北美市场的需要.主要比较静电放电、辐射抗扰、电快速瞬变/脉冲群、浪涌(冲击)、传导抗扰、稳态电力线感应抗扰度、DC电位差抗扰度、AC/DC失效测试、机架EFT测试、机架浪涌测试,以及传导发射、辐射发射等项目.     

电磁场与微波技术

044 99010682磁场辐射敏感度的快速测试/魏东明(723所)月舰船电子对抗.一1998,(3).一35一37讨论应用绕线法对大体积试样进行磁场辐射敏感度(R 5 01)的测试,以提高测试效率和准确度.图3表1参2(许)法具有一定的实用性.图4参7(金)0441 99010683复杂非均匀介质中多偶极层激励的位场分析/聂在平,袁宁(电子科技大学)11电子学报一1 998,26(6).一53一57,66利用半解析一半数值混合方法对复杂非均匀介质中单个和多个偶极层所激励的位场进行高效数值求解,并与有限元法结果及实验数据进行了对比验证,获得了满意的‘致.该方法已被用于自然电位响应问题的…     

推动高校普及EMC知识的有力工具

北京大泽科技有限公司针对各高校电子、电气专业最新推山了一套EMC教学突验系统,以达到普及EMC知识和培养EMC人才的目的。这套系统可以完成传导敏感度实验、辐射敏感度实验、传导干扰实验、辐射干扰实验和小屏蔽体的屏蔽效能测量实验等五个基础实验。每个实验均配有单独的实验任务指导书,明确了实验目的、实验方法、操作步骤、注意事项和实验结果。     

EMI／RFI电缆屏蔽导电热缩管

随着高速计算机和数据通讯设备的快速增长和需求，这些设备对电磁干扰(EMI)和射频干扰(RFI)的敏感度已成为日益突出的问题和挑战。在如今拥有高级电子系统的世界，敏感度表现为两种方式：系统内部传导的EMI／RFI引发自身功能紊乱；辐射的EMI／RFI引起相邻设备功能紊乱。     

The Computer-Aided Approach to Susceptibility Testing

Susceptibility testing is generally performed using manual methods which result in the following disadvantages and limitations: tests are time consuming, frequency and amplitude accuracy may not be satisfactory, operator errors can easily occur, and test setup inaccuracies are seldom taken into account and compensated. A new and low-cost method of performing susceptibility testing automatically is presented in this paper. With the advent of test instrumentation operated under digital control and the availability of standardized interface systems, it is now possible to build test systems to carry out automated susceptibility tests which are particularly advantageous when digital equipment are to be tested. By driving power amplifiers from programmable sweep generators, the repeatability and accuracy of the testing will be considerably increased as a result of accurate frequency and amplitude controls using control loops (AFC and ALC). A computer can be used to control and to manage the execution oftests as well as the processing of off-line test results. Major advantages given by the automation of susceptibility testing are increased measurement accuracy, reduction of testing costs and EMC-problem prediction capabilities.     

Modeling and testing of immunity of computerized equipment to fastelectrical transients

One of the major problems associated with testing computerized equipment for immunity stems from the fact that their susceptibility to electrical transients is time-variant. This paper develops an improved statistical model for the susceptibility of computerized equipment to electrical transients and illustrates a few affordable methods for estimating the mean and maximum malfunction probability in an operational cycle. Reinforcement learning algorithms are used to estimate the maximum susceptibility efficiently. These algorithms automatically restrict testing to the most susceptible time windows. This allows affordable testing for safety-related equipment and also supports effective redesign     

低浓度CO气体的OPO—CARS测量方法研究

利用相干反斯托克斯拉曼光谱（CARS）技术,根据在低浓度时极化率的共振项对非共振项的调制大小（调制度）与被测气体浓度的关系,提出了微量气体浓度的测量方法,建立了共振极化率的调制度与被测气体浓度、温度之间关系,验证了数量关系式的正确性,其结果是理论值与实验值在低浓度范围内的偏差不超过4.5%。并实测了酒精火焰中不同位置处的CO浓度,讨论了气体温度的等因素对测量结果的影响。     

Parallel Wire Susceptibility Testing for Signal Lines

A technique is presented which can be utilized to establish a standardized procedure for performing conducted susceptibility testing on signal lines at the component and/or the subsystem level. Typical military specifications require that the test function be injected to the test lines via a susceptibility transformer, a coupling capacitor, or a standardized network, such as the line stabilization network (LSN). Although these methods may be adequate for testing of power line susceptibility, they present several disadvantages when utilized in signal lines, such as impedance loading, the requirement for physical insertion, and proximity to the load. These disadvantages become more pronounced at RF where the signal developed across the input of the test specimen may be considerably lower than the signal injected at the physical insertion point. A technique that overcomes these deficiencies utilizes a coupling jig that 1) does not require a physical connection, and 2) provides a known coupling across the input impedance of the package being tested-thus simulating, in a very realistic manner, interference coupling as it may occur in a system. A general expression for coupling prediction and a computer solution for various values of load impedances are presented.     

空空导弹供电兼容性测试系统的研究

建立了空空导弹供电兼容性测试系统,该测试系统可依据GJB181A-2003对空空导弹进行供电发射和供电敏感度测试,检验空空导弹与飞机供电系统的供电兼容能力。     

A new immunity test method

A new measurement system and a mapping technique for immunity or susceptibility testing are discussed. The most unique point of the system is that the electromagnetic (EM) fields are of slowly rotating polarization controlled electronically. In this paper, methods for generating slowly rotating fields are discussed. The direction of field polarization can be varied continuously and in a short time. By combining the method with a turntable, for example, the immunity-or susceptibility-characteristic maps can be obtained easily. This visualization technique is useful to detect the immunity or susceptibility attributes at a glance and thus may make the development of products with high immunity easy     

OPO—CARS光谱技术与微量气体浓度的测量

本文利用相干反斯克斯拉曼光谱（CARS）技术,根据在低浓度时极化率的共振项对非共振项的调制与被测气体的浓度有关,提出了通过测量调制度求出微量气体浓度的方法,建立了共振极化率的调制度与被测气体浓度,温度之间关系,验证了数量关系式的正确性,其结果理论值与实验值在低浓度范围内的偏差不超过4．5％,并实测了酒精火焰中不同位置处的CO浓度,讨论了气体温度等因素对测量结果的影响。     

GPS 接收机交调互调敏感度测试方法研究

GPS 卫星定位技术已广泛应用于航空航天系统。本文通过阐述GPS 接收机的工作原理及GPS 信号的特点,分 析了接收机交调互调传导敏感度测量原理,扩展了GPS 接收机交调互调传导敏感度的试验方法。该测试方法快捷、易 于掌握,便于得到接收机互调交调抑制比参数。     

The spatial symmetric forms of third-order nonlinear susceptibility

A computer program is developed to generate the spatial symmetric forms of the third-order susceptibility tensor. Mistakes in the trigonal crystal classes (Butcher's "32" and Zhao's "3") were discovered and corrected. A completely corrected table for the third-order susceptibility is presented.