基于USB的卫星通用化地面测试软件的设计

本文将软件工程中的组件技术引入卫星测试领域,提出了利用测试功能组件构建通用化测试软件的设计思路。首先,对现有卫星型号的地面测试任务做共性研究;其次,总结通用化测试软件的研制需求;然后,进行软件概要设计和详细设计;最后,软件实现。经验证,本文提出的基于USB接口的卫星通用化地面测试软件,通用性强,能较好的满足多个分系统单机设备的测试要求。     

清洁、大流量真空差分系统的研制

本研究是为了设计一套大流量、清洁的真空差分系统.计算了超重反冲核实验装置终端真空差分系统各级的真空度;介绍了差分系统的设计和真空泵、测量设备选择;选择能在高压强下连续运行的新型分子/增压泵作为过渡流范围内的主排气泵,对分子增压泵进行了性能测试并对差分系统进行了模拟靶室实验,最后对实验结果进行了分析.     

清洁、大流量真空差分系统的研制

本研究是为了设计一套大流量、清洁的真空差分系统. 计算了超重反冲核实验装置终端真空差分系统各级的真空度; 介绍了差分系统的设计和真空泵、测量设备选择; 选择能在高压强下连续运行的新型分子/增压泵作为过渡流范围内的主排气泵, 对分子增压泵进行了性能测试并对差分系统进行了模拟靶室实验, 最后对实验结果进行了分析.     

卫星组网可视化仿真系统设计与实现

卫星组网是满足未来空间通信需求的有效方式,为实现空间卫星组网的可视化,设计了一种卫星组网可视化仿真系统;系统由星座设计分系统、星座覆盖性能分析分系统、数据处理分系统和可视化分系统组成;在组网过程中,首先在星座设计分系统中设置星座的参数,根据轨道参数模型计算出星座中每颗卫星的轨道参数,并将计算结果输出给星座覆盖性能分析分系统,完成对纬度、区域和全球覆盖效果的分析、评估和显示;仿真结果表明:系统能够对卫星组网进行实时计算和显示,计算精度比STK仿真软件提高12%,系统运行稳定,界面良好。     

星敏感器测试用微调整机构设计（英文）

针对高精度星敏感器在地面标定实验中与测试设备准确对接的实际要求,设计一种纳米级星敏感器标定用五维微调整机构.详细分析了光轴对准误差对敏感器测试的影响.为保证对接精确性,提出了搭积型调整架机械结构的设计思想;论述了二维平移和三维调整模块的设计方案;对调整机构进行了仿真建模和力学分析.对设计的微调整机构进行验证性实验,结果表明:位移分辨力可以达到25nm,角度分辨力可以达到0.1角秒,且稳定性高.设计的微调整机构可以满足星敏感器与测试设备准确对接的技术指标要求,确保了星敏感器定标结果的可信度.     

基于Labview的卫星电源地面监控系统研究

采用Labview平台、基于SQL Server设计并开发了一套能在卫星电源分系统的设计和开发阶段对其充电进行均衡控制并对相关性能进行测试的地面监控系统;介绍了卫星电源地面测控系统的组成和软件总体框架,详细阐述了软件主要功能,包括实时监测程序、在轨状态仿真控制程序、数据的保存、回放和维护程序等关键技术的实现方法;测试结果表明,该监控系统监测数据准确,采样精度优于0.1%,运行高效可靠。     

面向复杂系统的测试性试验验证技术研究

测试性试验验证是指产品在设计、研制、定型阶段,为了确认其测试性指标的量值,分析其测试性设计的正确性、合理性并识别设计缺陷、检测产品是否已经完全实现了测试性设计要求而进行的验证与评估活动。当前,对于设备级试验对象的测试性试验验证技术,已经形成了相关的技术规范,并在某些型号测试性验证工程中已全面使用,然而,产品的测试性设计水平的最终要体现在系统层面上,设备级的试验只能考核设备自身的故障检测和故障隔离能力（即对内场可更换单元（SRU）的检测和隔离能力）,而难以体现出系统级的检测和隔离能力（即对外场可更换单元（LRU）的检测和隔离能力）。系统的检测和隔离能力主要体现在：系统对设备自身检测结果的综合处理与分析能力、系统对设备故障的检测能力以及系统对自身功能的检测能力。因此,为了有效验证系统的测试性设计水平,必须开展系统级的测试性试验。本文在目前测试性试验技术存在的基础上,基于目前测试性试验的基本思路,从测试性试验方案设计及故障注入技术两个方面开展研究,提出了一套面向复杂系统级测试性试验的技术方法。     

基于LabVIEW与Multisim的火控系统半实物联合仿真方法

针对当前装甲装备火控系统电路组成与功能特点,对火控系统维修保养过程中的故障诊断方法与测试需求进行了研究,提出了一种火控系统半实物联合仿真方法,介绍了该仿真建模方法的设计思路与实现方法。该方法可充分发挥LabVIEW和Multisim软件的优势,通过半实物联合仿真的方法,以仿真模型代替部分或者全部火控系统部组件,能够很好地实现火控系统不同级别的电路功能模拟、故障复现,快速完成故障诊断分析,解决了当前装甲装备火控系统维修诊断设备通用性差、规范化程度低、开放性差,难以真实的模拟系统级、部件级功能、故障注入和故障检测等问题,为装甲装备火控系统故障诊断与测试设备开发提供了有效平台,为基层部队开展维修训练和维护保障提供了有效途径。     

一种新型激光参数综合测试仪

最近，北京测量与通信总体技术研究所设计并研制了一种激光参数综合测试仪。该测试仪主要由激光发射参数测试分系统、激光接收参数测试分系统、数据处理分系统及其辅助设备组成。激光发射参数测试分系统主要完成脉冲能量、输出功率、功率稳定性、脉冲宽度、工作重频、脉冲编码、激光发散角等参数的测试，包括激光功率能量计、数字存贮示波器、光斑测试仪等。激光接收参数测试分系统主要用于激光接收机灵敏度与动态范围等参数的测量。由激光光源、可变激光衰减器、激光功率能量计等组成。     

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。     

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.     

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.     

Retrieval of ultraviolet skylight radiances and O3 slant column densities from balloon-borne limb spectrometer

With a novel light-weight and absolutely calibrated ultraviolet （UV） spectrometer, UV skylight radiances and O3 slant column densities are measured by balloon-borne limb measurements in Xinjiang area, China. UV skylight radiances measured at the height of 31 km are compared with the results from Modtran in the wavelength range from 290 to 420 nm. O3 slant column densities are derived from radiance spectra in the Huggins bands （320 - 335 nm） using differential optical absorption spectroscopy method. And the parameter exhibits a good correlation with the same value simulated by radiative transfer model （Tracy）. The O3 profile simultaneously measured by an O3 sonde is used as input in Tracy calculations. The O3 sonde is launched on the same balloon.     

Design optimization of highly sensitive LSPR enhanced surface plasmon resonance biosensors with nanoholes

For breaking through the sensitivity limitation of conventional surface plasmon resonance (SPR) biosensors, novel highly sensitive SPR biosensors with Au nanoparticles and nanogratings enhancement have been proposed recently.But in practice, these structures have obvious disadvantages.In this study, a nanohole based sensitivity enhancement SPR biosensor is proposed and the influence of different structural parameters on the performance is investigated by using rigorous coupled wave analysis (RCWA).Electromagnetic field distributions around the nanohole are also given out to directly explain the performance difference for various structural parameters.The results indicate that significant sensitivity increase is associated with localized surface plasmons (LSPs) excitation mediated by nanoholes.Except to outcome the weakness of other LSP based biosensors, larger resonance angle shift, reflectance amplitude, and sharper SPR curves' width are obtained simultaneously under optimized structural parameters.     

Polymer gratings based on photopolymerization for low-order distributed feedback polymer lasers

Novel polymer distributed feedback(DFB)gratings are fabricated based on photopolymerization to reduce lasing threshold of polymer lasers.A photopolymer formulation sensitive to 355-nm ultraviolet(UV)light is proposed for the fabrication of polymer gratings and it can be used to form polymer films by spin-coating process.A very low surface-relief depth ranging from 12.5 to about 1.0 nm has been demonstrated with a refractive-index modulation of about 0.012.The experimental results indicate that such polymer gratings have promising potentials for the fabrication of low-order DFB organic semiconductor lasers.