某型制导武器通用自动测试系统方案设计

针对基于VXI总线的某型制导武器通用自动测试系统存在的测试效率难以提升、通用化和小型化程度不够、测试技术标准化和信息化水平不高等问题,提出基于PXI总线的某新型制导武器通用自动测试系统的总体设计技术方案,通过采用新型高速仪器总线、合成仪器、TPS可移植等技术,以及软硬件平台模块化、专测组件通用化等设计思想,实现了系统组件标准配置、测试信息网络传输、程序软件移植使用、资源扩展方便快捷的设计初衷,使系统形成跨平台通用化与互操作能力,是现阶段精确制导武器通用自动测试系统较为理想的系统平台解决方案,经新研系统实际试用证明,该设计方案切实可行,能大幅提升多型制导武器通用测试效率,提高部队测试保障能力。     

卫星导航接收机自动测试系统

为了满足卫星导航接收机整机性能快速、精确测试的需求,实现对导航接收机性能的自动测试,构建了一种基于NI PXI硬件平台,采用导航信号模拟器、虚拟仪器技术和Microsoft Visual Studio 2008软件进行开发的卫星导航接收机自动测试系统。系统实现了多导航接收机的定位精度、冷启动首次定位时间、热启动首次定位时间、捕获灵敏度、速度精度的并行自动测试。良好的人机交互界面与多接收机并行测试的稳定运行,大大缩短了测试时间,提高了测试效率。通过对北斗导航接收机大量测试,结果表明该卫星导航接收机快速测试系统对于导航接收机整机性能并行测试快速、有效。     

射频指标自动测试及故障诊断系统研究

自动测试与故障诊断的联合研究已经在电子设备实际工作中得到较为广泛的应用。文章针对通信设备研发阶段射频指标测试效率低下以及测试故障定位难度较大等问题,开发了基于虚拟仪器技术的自动测试系统以及适用于射频指标自动测试问题定位的智能故障诊断系统。故障诊系统采用基于专家系统的知识库及推理机制,解释机制采用预制文本法进行设计。实际运行结果表明该系统能够高效准确地完成射频指标自动测试,并对测试过程中出现的问题进行较为准确的定位。     

基于LabVIEW的电液伺服阀测试系统设计与实现

为了解决电液伺服阀测试中手动测试效率低下、误差率高的现状,开发了一种基于LabVIEW图形编程语言的自动测试系统;系统结合NI PCI-6232板卡,用LabVIEW软件实现了电液伺服阀的静态及动态特性的自动测试,系统具有数据采集、处理及实时显示、数据保存等功能;对空载流量特性、零位泄漏特性、压力特性等进行了实验测试,并对测试结果进行了分析,各测试数据在伺服阀允许的误差范围内;实验结果表明测试系统运行良好、数据采集及处理可靠有效。     

基于状态报告的测量同步技术研究及应用

自动测试系统中的测量同步对于提高测试系统性能和运行可靠性至关重要,基于状态报告系统的同步技术比软件延时法提供了更高的效率和更好的安全性。为解决自动测试系统中的指令同步问题,探讨了IEEE488.2和可编程仪器标准命令（SCPI）的状态报告模型、寄存器及同步机制,对利用SCPI状态报告机制实现自动测试系统测量指令同步的原理和方法进行了深入研究;通过原理分析和实例解析,分析了几种测量指令同步实现方法的时序、实现要点及关键技术,总结比较了几种同步方法的区别和适用场合,解决了自动测试系统中测量指令同步的问题。     

航空电子设备自动测试系统的软件架构设计

为检测和定位航空电子设备的故障,研究并设计了一种自动测试系统的软件架构;该架构包含了测试软件和测试数据库,测试数据库存储有测试被测设备的相关数据,测试软件将其作为输入,通过自动测试设备输送给被测设备,最终测试软件接收被测设备的输出并将其与测试数据库的预期数据相比较得出测试的结果;测试软件由手动测试模块、自动测试模块、系统自检测模块、测试记录读取和测试结果记录模块4个功能模块组成,自动测试和手动测试可以自由切换;该系统不仅能使用自动测试功能仿真被测设备的飞行环境,还可以使用手动测试功能具体定位分析故障,降低了设备的维护成本,缩短了维修时间。     

基于TestStand的检波功率放大器测试软件的开发应用

针对传统检波功率放大器测试设备测试效率低、操作繁琐、易误操作的缺点,设计了基于TestStand的检波功率放大器自动测试软件。该软件充分利用TestStand多线程并行高速执行的特点,实现了多套产品的同时自动测试;通过设计自定义测试项,并且将测试流程和测试项的设计分离,增强了软件的复用性和维护性;实际应用证明,该软件提高了测试效率,降低了测试成本,促进了自动测试设备领域的新发展。     

平流层飞艇地面通用测试原型系统设计

针对不同技术路线平流层飞艇试验靶场地面通用化综合测试评估的迫切需求,分析了平流层飞艇平台地面通用测试技术体制和测试矩阵,提出了飞艇地面通用测试原型系统总体架构,研究了系统功能组成和通用性。基于高速信息交换架构、合成仪器、公共测试接口等新一代自动测试系统关键技术,完成了原型系统的硬件、软件和机械结构设计方案,可以作为原型系统分系统实施方案设计、研制和综合集成调试的主要依据文件。经分析,地面通用测试原型系统可对多型号平流层飞艇实现快速自动通用测试评估,对飞行试验任务顺利完成起到的重要支撑作用。     

机载机电系统自动测试平台的设计与实现

以提高某型飞机机载机电系统UMS的外场故障定位和隔离能力为背景,实现资源整合,对UMS系统通用自动测试平台GPATE的硬件结构与软件技术进行了研究,介绍了GPATE平台的硬件结构的组成和软件架构的设计,在GPATE平台上采用标准化、模块化设计,实现了硬件的通用性和软件的可移植性。通过实验室静态仿真和外场动态验证表明,GPATE的设计合理、各项指标均能满足实现对UMS系统功能测试的要求,有效地提高了产品的故障检测率。     

基于VxWorks的某装备自动测试系统设计与实现

针对某装备的实时性测试需求、测试系统通用性和可扩展的需求,设计并研制了一套基于VxWorks操作系统的自动测试系统。该自动测试系统以工控机作为人机交互操作的核心;PXI机箱内置PXI仪器板卡和零槽控制器用于实现测试过程中激励信号的施加和被测对象响应信号的测量;系统软件采用虚拟仪器技术进行开发,虚拟仪器软件可进行二次开发和参数配置,使系统具有通用性和可扩展性。系统采用通用标准化信号接口连接器,保证了系统的扩展能力。     

Guided-Wave Two-Dimensional Acousto-Optic Scanner Using Proton-Exchanged Lithium Niobate Waveguide

Two-dimensional scanning of a 0.6328 mum guided-light beam has been realized using noncolinear acousto-optic (AO) coplanar Bragg diffraction together with colinear AO guided-mode to substrate radiation-mode conversion in a Z-cut Xpropagation LiNbO3 proton-exchanged (PE) waveguide. The two surface acoustic (SAW) waves utilized are at the center frequencies of 500 and 200 MHz, propagating in the Y and X axes, respectively. Two-dimensional scanning of approximately 720 resolvable light beam spots, namely, 18 40 (horizontal vertical) scanning, has been demonstrated using a light beam of 1.0 mm aperture. The total number of resolvable beam spots can be greatly increased from 720 by simply utilizing SAW transducers of larger bandwidth and a light beam of greater aperture. It should also be possible to significantly increase the diffraction efficiency from 3 % by optimizing the parameters of the PE waveguide and the SAWs.     

Hybrid Wavelength and Code Division Multiple Access in Optical Networks

A review of schemes for multiple access in fiber optic networks shows that a hybrid of wavelength and code division multiple access (WCDMA) combines the best features of both. In particular, the hybrid scheme retains the large information carrying capacity of wavelength division multiple access (WDMA) and flexibility of code division multiple access (CDMA). In this paper WDMA, optical CDMA (OCDMA), and WCDMA networks are discussed. In OCDMA networks, concept of incoherent and coherent coding including inverse decoding and matched filter is introduced. The delay performance of both WDMA and WCDMA networks, under the simple suboptimum access protocols based on cyclic search, is computed. It has been shown quantitatively that tuning delay significantly affects the delay performance of both WDMA and WCDMA networks. Futhermore, delay performance of WCDMA networks is always better than the WDMA networks for the same tuning delay, load, and number of users.     

Femtosecond Transform-Limited Pulse Generation by Compensating for the Linear Chirp of SPM Spectra in Dispersion Shifted Fibers

A simple technique of pulse compression, based on the linear chirp compensation of self-phase modulation (SPM) spectra in dispersion shifted fibers, is demonstrated. The optimization procedure is carried out, for a short span of a single-mode fiber, using a parabolic law, which describes the behavior of the squared output pulse width versus the pump peak power in the case of Gaussian pulses. The experimental results give a minimum pulse duration of 233 fs, which is in good agreement with the model. Shorter and coherent pulses, down to 90 fs, have been obtained by inserting an interference filter at the optical output.     

Effect ofγ-radiation on the spectral luminescence characteristics of impure cadmium tungstate crystals

Results of a study of the effect of γ-radiation on the spectral luminescence properties of cadmium tungstate crystals doped with silver, bismuth, and molybdenum cations are presented. Spectral characteristics of the nondnnnoped crystals are briefly described. Absorption and photo and X-ray luminescence spectra of the crystals taken before and after exposure to γ-radiation (5.5·10⁴ Gy) are compared. It is found that the spectral characteristics of the crystals doped with silver, bismuth, and molybdenum cations do not change markedly after the exposure. The relation between the type of impurity-induced defects, individual characteristics of the impurity cations, and the character of the effect of γ-radiation on the spectral luminescence properties of impure crystals is analyzed (preliminarily). Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 1, pp. 55–60, January–February, 1997.     

Theoretical analysis and simulation of conjugate heights for dual-conjugate AO system in lidar

A multi-conjugate adaptive optics （MCAO） can offer a possibility of widening field of view （FOV） characterized by the isoplanatic angle, and the choose of conjugate height becomes a basic problem for MCAO, which influences the size of iosplanatic angle. Considering the application of lidar, the isoplanatic angle＇s expressions of two deformable mirrors （DMs） MCAO for uplink and downlink are deduced. The effects of conjugate heights for dual-conjugate AO are thoughtfully discussed, and the isoplanatic angles are further analyzed. The results show that the isopanatic angle varies with the conjugate height and reaches the maximum as the conjugate height is at the optimal altitude. Moreover, the optimal conjugate height changes with the propagation distance.     

Quick single-photon detector with many avalanche photo diodes working on the time division

Due to the limit of response speed of the present single-photon detector, the code rate is still too low to come into practical use for the present quantum key distribution (QKD) system.A new idea is put up to design a quick single-photon detector.This quick single-photon detector is composed of a multi-port optic-fiber splitter and many avalanche photo diodes (APDs).Au of the ports with APDs work on the time division and cooperate with a logic discriminating and deciding unit driven by the clock signal.The operation frequency lies on the number N of ports, and can reach N times of the conventional single-photon detector.The single-photon prompt detection can come true for high repetition-rate pulses.The applying of this detector will largely raise the code rate of the QKD, and boost the commercial use.     

Research on beamforming method for dual-line array with space mismatch between the two line arrays

The performance of port/starboard discrimination of dual-line array will be seriously degraded when the space between the two line arrays of the dual-line array is mismatched. The directivity function of the delay-sum and delay-subtract beamforming is deduced and the port/starboard discrimination of the delay-sum and delay-subtract beamforming is also studied both under the ideal status and the status under which the space between the two line arrays of the dual-line array is mismatched. Analysis results show the delay-subtract beamforming has better performance of port/starboard discrimination. At last, the sea trial results demonstrate the theoretical results.     

Sorting of bending magnets for the SSRF booster

The Shanghai Synchrotron Radiation Facility(SSRF)booster ring,a full energy injector for the storage ring,is deigned to accelerate the electron beam energy from 150MeV to 3.5GeV that demands high extraction efficiency at the extraction energy with low beam loss rate when electrons are ramping.Closed orbit distortion(COD)caused by bending magnet field uniformity errors which affects the machine performance harmfully could be effectively reduced by bending magnet location sorting.Considering the affections of random errors in measurement,both ideal sorting and realistic sorting are studied based on measured bending magnet field uniformity errors and one reasonable combination of bending magnets which can reduce the horizontal COD by a factor of 5is given as the final installation sequence of the booster bending magnets in this paper.