基于LabVIEW的砝码自动检定系统设计与实现

针对目前砝码检定工作操作过程复杂、检定效率低等问题,设计了一种基于LabVIEW的砝码自动检定系统。在符合砝码检定规程的情况下,系统实现了检定数据实时采集、数据处理、生成原始记录、管理标准器、查询历史数据和衡器控制等功能。相对现有的砝码检定方法有操作简单、高效、程序移植性好等优点。系统由主控计算机、串口转无线扩展卡、多台衡器设备及相应的标准砝码装置组成。通过使用串口转Wi-Fi模块,系统可实现控制多台衡器设备的需求。实验结果证明,系统运行稳定可靠,采集数据准确,容易扩展,且大幅度减轻了检定人员的劳动强度,在计量检定工作中具有一定的实用和推广价值。     

可接入射频半实物的试验数据转换系统设计与实现

试验环节是产品研制生命周期中的重要环节,但是一直以来都缺乏有效的管理手段,在整个测试阶段都存在大量的人为的、重复性的工作,导致试验效率低下,为改善这一现状,提高试验效率,提出了一种基于PXIe数据采集系统,借助LabVIEW和DIAdem软件的测试系统解决方案：以LabVIEW控制数据高速同步采集,DIAdem调用LabVIEW模块执行算法分析,通过软件集成,实现对测试系统的全面管理,包括数据采集、数据检索、数据分析、报表生成及整个流程的自动化控制。本文以C919飞机电源测试系统为介绍对象,对该套测试系统解决方案进行阐述,实际测试情况表明,在数据吞吐率大于200M/S的情况下,相对传统测试方法,该测试方案在保证测试精度的基础上,极大的提高了试验效率,极大的提高了系统的可扩展性和可维护性。     

可信计算模式下P2P匿名通信系统设计

为了提高P2P匿名通信系统的安全性与可信性,需要对P2P匿名通信系统进行设计。当前使用的匿名通信系统,无法在用户节点匿名的情况下,保证P2P匿名通信系统匿名节点的可信性。因此,提出一种基于可信计算模式的P2P匿名通信系统设计方法。该系统的硬件部分分为系统登录模块、通信模块、数据模块、可信计算模块4大模块,模块之间相互合作,形成一个完整的匿名通信系统,匿名通信系统软件设计部分通过建立可信计算的联接,实现在匿名通道中进行数据传递,并对待传递的数据进行层次性打包加密,同时采用可信度计算对匿名通信系统中节点、匿名通道进行计算,形成安全可信的匿名传递通道。实验仿真证明,该方法在保证该系统数据传递的效率的同时提高了匿名通信系统的安全性与可靠性。     

具有多物理特性的X射线脉冲星导航地面验证系统

导航地面验证是X射线脉冲星导航研究必不可少的环节.针对导航算法验证需要真实连续的脉冲星信号的需求,同时避免X射线调制及探测难度大、成本高的问题,提出了一种基于可见光源的X射线脉冲星导航地面验证系统.该系统利用太阳系质心处脉冲星信号模型和航天器轨道信息,建立航天器处实时光子到达速率函数,再通过硬件系统转换成电压信号,利用该电压控制线性光源输出,最后经衰减、探测及甄别后获得航天器处的实时光子到达时间序列.该时间序列不仅具有导航脉冲星的轮廓特性、自转特性,还包括空间传播时间效应及宇宙X射线背景.本系统利用半物理装置对可见光进行调制及衰减,实时判断轨道各位置处导航脉冲星的可见性,实现X射线脉冲星信号传播过程的模拟.该系统提供四路可控输出信号,支持多种导航模式的验证.仿真系统的性能分析和功能验证结果表明,该系统具有良好的性能,可提供真实便捷的地面验证环境.     

基于i6000的信息通信资源申请系统的研究

为满足不同业务资源申请审批,实现业务标准化及信息化,不同业务流程网上流转和无纸化办公,需要对信息通信资源申请系统进行设计。当前申请系统是将申请流程定义为一个五元组制定资源申请指标,设置资源申请定时器,如果定时警报响起,则将申请直接驳回至缓存队列中,继续等待申请,迭代上述过程,完成对信息通信资源申请系统设计。但没有设定迭代需要达到的指标,导致申请流程循环性严重,申请效率低。为此,提出了一种基于i6000的信息通信资源申请系统设计方法。该方法首先对信息通信资源申请流程和申请系统构造进行设计,然后利用FCM算法得到信息通信资源数据的聚类中心,对信息通信资源数据进行划分,采用投票法完成对信息通信资源数据的聚类集成,利用流量预测算法对信息通信资源进行申请,依据静态和动态结合的宽带分配法完成信息通信资源共享,并引入记录因子对资源申请的分配情况进行记录,使资源申请系统自动对资源申请进行处理。实验结果证明,所提方法提高工作效率,实现工作量化和信息通信资源信息化管理。     

星载测量通信系统模拟器设计与实现

为了在地面对星载测量通信系统之间互联互通性能进行测试评估,设计了一种可替代星载测量通信系统的地面模拟器,该模拟器由收发信机,时频单元,信道仿真器以及管理控制计算机构成,收发信机采用双FPGA架构设计,支持星间信号的收发处理,在功能性能指标方面与星载设备具有良好的一致性,信道仿真器能够实现信号传输延时、多普勒以及衰落特性的实时仿真,可显著增强试验场景的真实性以及评估结论的可信性。互联互通试验过程表明,该模拟器功能齐全、性能可靠、操控简单并且易于搬运,试验结果有效验证了星间互联互通方案的可行性。     

The principle of the positioning system based on communication satellites

It is a long dream to realize the communication and navigation functionality in a satellite system in the world. This paper introduces how to establish the system, a positioning system based on communication satellites called Chinese Area Positioning System (CAPS). Instead of the typical navigation satellites, the communication satellites are configured firstly to transfer navigation signals from ground stations, and can be used to obtain service of the positioning, velocity and time, and to achieve the function of navigation and positioning. Some key technique issues should be first solved; they include the accuracy position determination and orbit prediction of the communication satellites, the measuring and calculation of transfer time of the signals, the carrier frequency drift in communication satellite signal transfer, how to improve the geometrical configuration of the constellation in the system, and the integration of navigation & communication. Several innovative methods are developed to make the new system have full functions of navigation and communication. Based on the development of crucial techniques and methods, the CAPS demonstration system has been designed and developed. Four communication satellites in the geosynchronous orbit (GEO) located at 87.5°E, 110.5°E, 134°E, 142°E and barometric altimetry are used in the CAPS system. The GEO satellites located at 134°E and 142°E are decommissioned GEO (DGEO) satellites. C-band is used as the navigation band. Dual frequency at C1=4143.15 MHz and C2=3826.02 MHz as well as dual codes with standard code (CA code and precision code (P code)) are adopted. The ground segment consists of five ground stations; the master station is in Lintong, Xi’an. The ground stations take a lot of responsibilities, including monitor and management of the operation of all system components, determination of the satellite position and prediction of the satellite orbit, accomplishment of the virtual atomic clock measurement, transmission and receiving navigation signals to and from each satellite. In the north, the south, the east, the west and the center of Chinese main land, the function of CAPS demonstration system is checked and measured. In cars and on board the system is also checked and measured. The results are as follow: CA-code, horizontal positioning accuracy, 15–25 m (1 σ), vertical, 1–3 m; P-code, horizontal positioning accuracy, 8–10 m (1 σ), vertical, 1–3 m; velocity accuracy, CA-code, 0.13–0.30 m/s, P-code, 0.15–0.17 m/s; time accuracy, CA-code, 160 ns, P-code, 13 ns; determination accuracy of orbit ≤2 m. About 20 million US $ and two years are spent for the development of demonstration. A complete CAPS system is now being established. Supported by the National Natural Science Foundation of China (Grant No. 10453001), the National Basic Research Program of China (Grant No. 2007CB815500), the National High Technology Research and Development Program of China (Grant No. 2004AA105030), and the Funds of the Chinese Academy of Sciences for Key Topics in Innovation Engineering (Grant No. KGCXI-21)     

助航灯光单灯监控系统的数据传输设计与实现

针对助航灯光单灯监控系统数据传输存在的问题,提出了基于无线传感网络技术和GPRS/GSM技术的综合通讯方案。对系统组成中的微处理器、射频模块、GPRS/GSM模块硬件进行了介绍,重点阐述了通讯模块软件的设计以及监控系统平台的搭建.该系统实现了助航灯巡检自动化,可以实时监控灯光设备运行状况。对通讯中关键技术一点对多点通信进行了讨论。测试结果表明,系统能够稳定可靠进行数据传输,满足了机场对助航灯自动巡检要求。 基于无线通信技术的助航灯光单灯监控系统能够增强机场地面保障能力。     

The transmission link of CAPS navigation and communication system

The Chinese Area Positioning System (CAPS) is based on communication satellites with integrated capability, which is different from the Global Positioning System (GPS), the International Maritime Satellite Organization (Inmarsat) and so on. CAPS works at C-band, and its navigation information is not directly generated from the satellite, but from the master control station on the ground and transmitted to users via the satellite. The slightly inclined geostationary-satellite orbit (SIGSO) satellites are adopted in CAPS. All of these increase the difficulty in the design of the system and terminals. In this paper, the authors study the CAPS configuration parameters of the navigation master control station, information transmission capability, and the selection of the antenna aperture of the communication center station, as well as the impact of satellite parameters on the whole communication system from the perspective of the transmission link budget. The conclusion of availability of the CAPS navigation system is achieved. The results show that the CAPS inbound communication system forms a new low-data-rate satellite communication system, which can accommodate mass communication terminals with the transmission rate of no more than 1 kbps for every terminal. The communication center station should be configured with a large-aperture antenna (about 10–15 m); spread spectrum communication technology should be used with the spreading gain as high as about 40 dB; reduction of the satellite transponder gain attenuation is beneficial to improving the signal-to-noise ratio of the system, with the attenuation value of 0 or 2 dB as the best choice. The fact that the CAPS navigation system has been checked and accepted by the experts and the operation is stable till now clarifies the rationality of the analysis results. The fact that a variety of experiments and applications of the satellite communication system designed according to the findings in this paper have been successfully carried out confirms the correctness of the study results. Supported by the National Basic Research and Development Program of China (Grant No. 2007CB815504) and the Technology Research and Development Program of China (Grant No. 2007AA12z343)     

Ka频段飞行器测控与通信系统设计

传统基于S频段的统一载波测控系统受工作频率低、频带窄的特点限制,无法满足各类飞行器测控与通信系统对高速数传、宽带扩频、克服“黑障”、抗干扰等方面日益增长的需求,给系统设计带来了新的挑战。本文提出一种基于Ka频段直接序列扩频通信体制的实现遥测、外测、遥控等功能的飞行器测控与通信系统,给出了系统架构及主要设备组成,同时对地面测试方案进行了介绍。该系统具备体积小、频带宽、扩展性好等特点,可用于未来空间飞行器特别是小型化、大容量飞行器设计。     

基于ARM920T的嵌入式远程及时通信系统设计

目前随着交通复杂程度的不断增大,当前的交通通信系统无法满足车辆间远程、及时通信的要求,降低了行车安全性。为此,设计一种基于基于ARM920T的嵌入式远程及时通信系统,介绍了系统需实现的功能,以ARM920T芯片为核心,利用通信管理机完成数据交换,结合嵌入式系统平台完成系统硬件设计。基于ARM920T的车辆通信子系统通过车辆通信对车辆的行驶进行及时的路线跟踪、碰撞提醒,状态监测以及历史轨迹显示回放。对通信子系统进行设计,子系统分别为车辆定位系统以及车辆调度系统,构建车辆通信模型,进一步实现车辆精准远程通信,并结合蚁群算法对车辆通信模型进行求解。实验结果表明,所设计通信系统不仅通信精度高,而且成本较低,实时性优。     

固体火箭发动机尾焰电磁波衰减试验验证技术研究

通过对固体火箭发动机地面试验现场环境及尾焰电磁波衰减近场测试技术进行研究,设计了基于矢量网络分析仪的固体火箭发动机尾焰电磁波衰减试验验证系统,介绍了尾焰电磁波衰减试验验证总体方案,现场测试方法,尾焰电磁波衰减现场测试系统硬件组成,测试系统原位校准技术,现场测试天线构建和天线位置校准方法等的研究。对构建好的测试系统进行了工程应用,并取得了良好的试验效果。     

分布式光伏充电站Web实时监控平台设计

随着光伏充电站基础设施的广泛建设,为电动汽车用户提供便利的同时,也为其管理带来了巨大的挑战;为了实现对光伏充电站更加有效的管理,在分析分布式光伏充电站数据通信方案的基础上,设计了一种光伏充电站Web实时监控平台;该平台基于ZigBee技术、GPRS-DTU技术、HTTP协议设计了直流充电桩无线传感器数据采集方案,部署数据库服务器、Web服务器以克服充电站无人值守的问题,实现对该分布式系统的集中管控,同时设计用于充电预约、监控、提醒等功能的安卓用户APP以提升用户体验,并对该系统进行实验验证;经验证,该设计方案能够有效实现对分布式光伏充电站的实时数据采集与Web端集中管控,为充电站无人值守与远程监控提供了一种有效的技术解决方案。     

Large-aperture double-focus laser collimator for PAT performance testing of inter-satellite laser communication terminal

A laser collimator is necessary for testing and verification of the pointing, acquisition and tracking (PAT) performance of inter-satellite laser communication terminals on the ground. The laser collimator must have a large clear aperture to fit the PAT performance testing system. The PAT subsystem has a large field of view for the acquisition and a high angular accuracy for the fine tracking. To resolve the conflict between large field of view and fine angular resolution, a large-aperture double-focus laser collimator is proposed and its optical design and mechanical structure are described. The collimator mainly consists of a primary lens, a reflector, a beam-splitting plate, a secondary lens, two compensating lenses, two imaging sensors and a laser. The primary lens directly forms the long focal length arm of the collimator. The combination of the primary lens and the secondary lens form the short focal length arm of the collimator. The collimator has an angular resolution <0.75 μrad and a 10 mrad field of view. For the collimator, the incident beam is focused on the two imaging sensors by its two arms, and the beam emitted from the laser is collimated and transmitted. The collimator is combined with an optical scanner and a fine beam deflector to test and verify the PAT performance of the inter-satellite laser communication terminal in a full physical manner.     

X射线通信系统的误码率分析

基于栅极控制脉冲发射X射线源与单光子探测技术的X射线通信语音方案已经在实验室实现, 为探索未来X射线深空通信应用打下了坚实的基础. 实验室X射线语音通信演示系统实现后, 迫切需要测试X射线通信系统的误码率性能. 在泊松噪声模型下对X射线通信演示系统的理论分析的基础上, 使用基于现场可编程门阵列的误码率测量方法对开关键控调制方式下X 射线通信误码率进行测量. 通过实验测量发现, 要实现语音通信, 系统误码率应该达到10^-4 量级; 分析、测量了现有系统在开关键控调制方式下不同速率对应的误码率, 论证了泊松噪声模型理论分析现有X射线通信系统的合理性; 分析提出了限制现有实验室条件下X 射线通信误码率性能的主要因素.     

基于组态软件和多串口通讯的真空检漏监测系统设计与开发

许 婕,蔡立君,卢 勇,罗 山,张 龙,田培红     

Coplanar waveguide-fed compact planar ultra-wideband antenna with inverted L-shaped and extended U-shaped ground for portable communication devices

To simultaneously cover multiple wireless services and protocols, the antenna in communication devices should operate over a wide and ultra-wide frequency band. The use of wide/ultra-wideband antennas not only lessens the number of antennas necessary to cover multiple frequency bands but also decreases the system complexity, size, and costs. To operate over the ultra-wide frequency band, in this paper a CPW-fed small antenna is reported for portable communication devices. The anticipated antenna comprises a bow-tie-shaped patch and two ground planes. One inverted L-shaped and one extended U-shaped ground plane are asymmetrically placed with the main radiator which helps the antenna prototype to realize a functional band of 3.05 – 11.25 GHz (VSWR ≤ 2). In the functional band, the studied antenna accomplished a maximum peak gain of 4.98 dBi and maximum efficiency of 94.4%. Moreover, it exhibits symmetric omnidirectional radiation patterns and good time-domain behavior. The lucrative characteristics such as simple design, very small size (24.5 × 20 mm²), ultra-wide operating band, good gain and efficiency, stable radiation characteristics, and good time-domain characteristics make it a potential candidate to be used in portable communication devices.     

基于GMS90C32单片机的GPS授时显示系统设计与实现

提出了基于GMS90C32 单片机的GPS 显示系统的设计方法。从硬件实现和软件实现这两个方面给出了基于GMS90C32单片机的GPS授时显示系统设计,在系统的硬件设计部分,首先给出了各个功能模块和相关的技术参数,其次针对各个功能模块详细介绍了其功能的实现和电路的连接;在系统软件设计部分,首先给出了系统软件设计主程序, 然后重点分析了GPS模块信息及串口程序以及12864液晶屏驱动程序。最后系统测试表明,系统不仅能够显示GPS模块的授时信息,而且可以向外界发送授时信息。使用无线模块并制定相应通信协议,使得其他设备可以通过无线模块接收本系统中获取的GPS授时信息。这样无需在设备中集成体积庞大的GPS模块,从而减少设备体积和生产成本。     

多总线通讯服务器设计与实现

为了解决大当量战斗部爆炸威力试验中测试参数多、测试区域广,多设备统一触发的难题,文中提出了分布式无线网络化的测试思路,进行了无线传输系统框架设计,简要介绍了系统的组成、功能、结构设计、各个通信点位的设计、网络构成、工作频率、电源系统设计等,使大家对该测试系统有一个全面的认识。设计人员研发了相关硬件设备,并进行了多发试验验证。该测试系统组网方式灵活,传输速率高,具备GPS同步和无线触发功能,可进行远程操控和数据下载,使用方便,可靠性高,提高了大当量战斗部爆炸威力的测试效率。     

无线激光通信在高速视频传输中的应用

利用无线激光通信传输速率高的优势,设计并实现了一套622Mbps视频传输系统。将视频转换、数据处理、激光收发等功能集中在单块电路板上,提高了灵活性。使用片内异步先进先出队列（FIFO）组成乒乓操作,对连续视频数据流进行有效切换控制。采用曼彻斯特编码较好地从接收信号中恢复出数据和时钟,有利于接收串行数据流的边界检测和同步。实验表明,本系统可以稳定地传输视频,满足地面距离应用的需要,为进一步研究激光通信各项技术提供了平台。