INFORMATION FUSION TECHNOLOGY FOR FSINS/DR/BEIDOU DOUBLE-STAR IN LAND FIGHTING-VEHICLE

The fiber strapdown inertial navigation system （FSINS）/dead reckoning （DR）/Beidou double-star integrated navigation scheme is proposed aiming at the need of land fighting-vehicle independence positioning. The measurement information fusion technology is studied by introducing the FSINS/DR/Beidou double-star integrated scheme. Several specific methods for the information fusion are discussed, and a Kalman filter is designed for the information fusion. Experimental results show that the design of the integrated scheme can improve the positioning accuracy of the navigation system.

Power control scheme for multiple antenna systems with space-time coding in Rayleigh fading channels

Two optimal power control （PC） schemes under the power constraint for space-time coded multiple input multiple output systems over the flat Rayleigh fading channel with the imperfect channel state information （CSI） are presented. One is based on the minimization of a bit error rate （BER）, and the other is based on the maximization of a fuzzy signal-to-noise ratio. In these schemes, different powers are allocated to individual transmit an- tennas rather than equal power in the conventional one. For the first scheme, the optimal PC procedure is developed. It is shown that the Lagrange multiplier for the constrained optimization in the power control does exist and is unique. A practical iterative algorithm based on Newton＇s method for finding the Lagrange multiplier is proposed. In the second scheme, some existing schemes are included, and a suboptimal PC procedure is developed by means of the asymptotic performance analysis. With this suboptimal scheme, a simple PC calculation formula is provided, and thus the calculation of the PC will be straightforward. Moreover, the suboptimal scheme has the BER performance close to the optimal scheme. Simulation results show that the two PC schemes can provide BER lower than the equal PC and antenna selection scheme under the imperfect CSI.

OPTIMAL ANTENNA SUBSET SELECTION AND BLIND DETECTION APPROACH APPLIED TO ORTHOGONAL SPACE-TIME BLOCK CODING

An approach combining optimal antenna subset selection with blind detection scheme for Orthogonal Space-Time Block Coding (OSTBC) is proposed in this paper. The optimal antenna sub- set selection is taken into account at transmitter and/or receiver sides, which chooses the optimal an- tennas to increase the diversity order of OSTBC and improve further its performance. In order to en- hance the robustness of the detection used in the conventional OSTBC scheme, a blind detection scheme based on Independent Component Analysis (ICA) is exploited which can directly extract transmitted signals without channel estimation. Performance analysis shows that the proposed ap- proach can achieve the full diversity and the flexibility of system design by using the antenna selec-tion and the ICA based blind detection schemes.

Infinite Freedom of Space-Time for Zero-Energy-Entity in Quantum Mechanics

Zero-energy state is investigated by taking infinitesimal energy and observing its uncertainty in space-time, adopting quantum mechanics. In this paper, the uncertainty in conventional quantum mechanics is found to be interpreted as freedom in space-time, which results in possibility of time travel and space transition of the zero-energy state, which could be information or mind. The wave function of a physical system composed of multiple particles or wave-packets is examined and found that it can be arbitrarily changed by grouping by observers. It leads to an idea that even infinitesimal energy or wave-packets in a heavy physical system may separately exist and it has the infinite freedom of space-time.

BeiDou Integrated Disaster Reduction Application Platform

To better improve the emergency communication and location-based services of disaster information reporting network for serious natural response and relieL disaster emergency the national natural disaster reduction application platform based on BeiDou navigation satellite system is constructed. The administrative distributed platform is integrated with BeiDou positioning and multiple communication ways so as to achieve main disaster reduction application services, including disaster information acquisition and monitoring, emergency relief for trapped people, on-site emergency relief command service, relief supplies＇ transportation monitoring, and disaster information publishing service. By the platform, serious disaster information reporting time may be reduced to one hour and the emergency decision-making information service for serious natural disasters can be effectively improved, and it will be helpful to provide technical references for the industrial application and promotion of BeiDou inte- grated disaster reduction.

面向电子信息类课程的新时代北斗精神跨课程协同思政探索

新时代北斗精神融入电子信息类课程思政具有鲜明的时代价值与现实意义。为有效保证课程思政质效,提高课程思政精准性和体系性,研究新时代北斗精神的跨课程协同思政。结合新时代北斗精神内涵,该文分析跨课程协同思政总体要求和协同思政目标,进一步从协同思政资源体系建设和协同思政教学模式两个层面给出推动新时代北斗精神跨课程协同思政的有效举措,最后对于常态化推动跨课程协同思政给出若干建议。该文工作成果对于推进课程教学改革,支撑实现协同育人、体系育人提供有益参考。

北斗三代短报文通信技术在配电网营销数据采集及费控停复电领域的应用

研究探讨了北斗三代短报文通信技术在高海拔地区的配电网营销数据采集及费控停复电领域中的应用效果。尽管目前该技术得到了广泛应用,但其在处理大规模递增数据时的性能尚未得到充分验证。因此,研究针对该技术在高海拔地区的系统设计和性能进行了实证评估。结果表明,在数据总字节从64字节增至409字节,理论传输时耗从10秒增至310秒的情况下,北斗短报文通信一体机的丢包数从1.3轻微上升到1.9,而且实际传输时耗的增长保持在合理范围内。这些发现表明,北斗三代短报文通信技术在提升工作效率、保障电力供应稳定性以及有效处理大规模数据传输任务方面具有显著优势。

基于GIS的土壤墒情信息采集与监测系统

文章详细描述一个由微控制器建立的农田土壤墒情监测系统,该系统主要包括STM8S系列微控制器、土壤湿度传感器、DS18B20温度传感器、4G网络模块、北斗导航模块以及环境传感器等部分,能够实时收集农田土壤和空气的温湿度以及大气压力数据。该系统通过网络模块将收集的传感器信息传输至服务器,并用北斗系统对采集地点进行卫星定位。通过GIS软件,系统能实时追踪土壤湿度状况,并构造出土壤墒情的空间分布图。农户可通过手机APP实时查看土壤墒情信息,并通过APP的数据分析来确定农田的供给情况,并做出反应。经过实际测试,该系统操作简洁、性能稳定,可以帮助农户管理农田。

基于北斗卫星通信导航的电力应急抢修指挥系统设计

电力系统运行环境复杂,受高电压、不均衡负载等因素的影响,导致应急抢修指挥过程中故障定位精度较差,抢修耗时长。为此,提出一种基于北斗卫星通信导航的电力应急抢修指挥系统。系统硬件以北斗卫星通信导航平台作为核心,设计北斗卫星通信导航平台的监测模块、故障提取与转发模块、路径规划模块、调度中心模块。根据模块化的设计理念,设计故障定位与最佳路径规划的软件程序,通过信息熵算法与决策树得到应急状态的划分,通过不同等级安排相应的抢修策略,完成电力应急抢修的指挥。实验结果表明,所提方法的抢修时间短、故障定位效果好、失负荷量小。

The space-time references of BeiDou Navigation Satellite System

The BeiDou Navigation Satellite System (BDS) is essentially a precise time measurement and time synchronization system for a large-scale space near the Earth. General relativity is the basic theoretical framework for the information processing in the master control station of BDS. Having introduced the basic conceptions of relativistic space-time reference systems, the space-time references of BDS are analyzed and the function and acquisition method of the Earth Orientation Parameters (EOP) are briefly discussed. The basic space reference of BDS is BeiDou Coordinate System (BDCS), and the time standard is the BDS Time (BDT). BDCS and BDT are the realizations of the Geocentric Terrestrial Reference System (GTRS) and the Terrestrial Time (TT) for BDS, respectively. The station coordinates in the BDCS are consistent with those in International Terrestrial Reference Frame (ITRF)2014 at the cm-level and the difference in scale is about 1.1 × 10^(−8) . The time deviation of BDT relative to International Atomic Time (TAI) is less than 50 ns and the frequency deviation is less than 2 × 10^(−14) . The Geocentric Celestial Reference System (GCRS) and the solar Barycentric Celestial Reference System (BCRS) are also involved in the operation of BDS. The observation models for time synchronization and precise orbit determination are established within the GCRS framework. The coordinate transformation between BDCS and GCRS is consistent with the International Earth Rotation and Reference Systems Service (IERS). In the autonomous operation mode without the support of the ground master control station, Earth Orientation Parameters (EOP) is obtained by means of long-term prediction and on-board observation. The observa-tion models for the on-board astrometry should be established within the BCRS framework.

基于北斗的移动信息采集终端设计与实现

针对北斗卫星导航应用领域中信息采集终端功能不够丰富的实际情况,提出利用北斗导航定位和通信功能设计信息采集终端的方法,融合芯片技术和电路技术一体化集成多源异构传感器,统筹设计终端硬件电路和器件布局,兼顾小型化、低功耗和拓展接口,开发软件程序实现主控芯片有效控制终端多种功能模块,设计统一的传感信息协议,解决数据接口问题,最终研制出功能实用、性能稳定、可操作性强的手持终端。该终端除提供基础位置信息服务外,还可以根据特定用户的使用需求和功能要求,通过集成专业传感器采集温/湿度、振动、形变等多样化信息,为特定行业的监控管理提供智能化手段,为北斗应用推广提供技术支持。

北斗全球海上遇险与安全服务体系探究

随着北斗报文服务系统、北斗国际搜救服务通过国际组织认可及北斗短报文在国内船舶的应用成效,初步形成北斗海上遇险与安全服务.本文提出北斗全球海上遇险与安全服务体系概念,通过引入广义北斗任务控制中心(BeiDou mission control center,BD-MCC)给出体系架构组成,并从北斗特色服务、海事通信业务到系统服务层面分析该体系在亚太与全球服务的功能特征,梳理该体系中北斗报文服务系统、北斗国际搜救系统、北斗应急示位搜救系统、北斗船舶远程识别与跟踪系统(long range identification and tracking, LRIT)、北斗船舶保安报警系统(ship security alert system,SSAS)以及北斗海上安全信息播发系统的业务流程及服务规范;展望该体系的系统化、国际化及定制化应用;研究成果有助于推动北斗通导在全球海上遇险与安全业务领域体系化应用.

云南北斗三号气象应急备份系统省级指挥机安装应用

云南北斗三号气象应急备份系统指挥机安装应用是云南省气象台山洪地质灾害防治气象保障工程基层气象台站应急通信系统的重要部分,使用新的天线、指挥机和新的平台,较上一代的抗干扰性、报文传输的质量和效率都有提升,北斗三号指挥机可以与北斗终端进行应急信息的双向通信;指挥机兼容北斗二号终端和北斗三号终端;可同时管理上百个用户。确保发生故障时的气象信息备份,为气象数据传输提供了必要支撑。

BDSBAS和WAAS增强定位性能评估

针对星基增强系统(SBAS)播发的单频增强服务电文一般仅用于增强单频定位的问题,提出一种使用单频增强电文增强双频定位的方法,推导利用单频增强信息增强单频和双频标准单点定位(SPP)的数学模型,并进一步分析北斗星基增强系统(BDSBAS)和广域增强系统(WAAS)增强性能,结果表明,使用BDSBAS和WAAS单频增强信息增强全球定位系统(GPS)L1C/A单频SPP时三维定位精度分别提升25%~50%、45%~70%,增强L1C/A+L2P双频SPP时三维定位精度分别提升10%~40%、10%~50%。

浅析北斗卫星导航系统在测绘行业中的应用

北斗卫星导航系统作为国家重要的时空基础设施,为国家安全和经济社会发展及全球用户提供全天候、全天时、高精度的定位、导航和授时服务。在此背景下,通过深入探讨北斗卫星导航系统的基础理论框架与运作机制,着重阐述其在土地测绘、海洋测绘、工程测量等测绘地理信息领域的广泛应用实践;分析该定位系统在实际应用中的优势与不足,并重点剖析其在测绘行业应用中面临的问题与挑战。最后,结合当前测绘地理信息行业的发展趋势,为北斗卫星导航系统未来的发展方向提出了一些建议。

新型航海随身信息交互装置研究

随着航运业的发展,现有的船舶信息交互已不能满足船员日常工作的需求。新型航海随身信息交互装置是基于Android系统,利用北斗RDSS和WiFi传输技术的船用信息终端,可实现船员船舶报警接收、气象信息接收、发射紧急报警、全域实时跟踪定位等功能,可以更好地保障船员的生命安全,提高其管理效率。同时,在海上作业人员中应用北斗短报文通信,既能有效解决海上远程数据通信和定位难题,又能融入北斗国家发展战略,推动北斗产业化应用,对发展智慧航运具有重要意义。

基于北斗通信的信息服务平台设计与实现

北斗卫星系统通过地球同步通信卫星的数据转发功能,可实现导航与通信一体化服务。因此,以北斗短报文通信技术和Spring应用框架为基础,研究并设计基于北斗导航与通信的综合信息服务平台系统,对系统进行总体方案设计。该系统主要由北斗通信前置机、内部RPC通信、数据存储、安全控制、Web等子系统组成。该研究成果可应用于构建地面向陆地和海洋的跨区域远程信息传输系统和运营网络,在车联网、船联网以及气象、水文、环境监测、应急通信等领域具有广阔的应用前景。

基于5G+北斗高精度定位技术的铁路机车调度数字化管理创新应用

随着石油化工行业的快速发展,铁路车辆运输的实时监控和调度管理成为提升经济效益和社会责任的关键。介绍了中韩石化铁路调运系统中5G与北斗高精度定位技术的融合应用。该系统通过车号识别系统、北斗高精度定位技术和企业5G物联网,实现了对铁路车辆的在线、实时、高速追踪和高效调度,不仅提高了铁路运输的整体效率,降低了运营成本,而且显著提升了应急响应能力和安全管理水平。

基于北斗卫星的预警信息发布技术研究及实现

利用北斗卫星短报文通信功能,以广播方式发布预警信息,可提高预警信息的覆盖范围和时效性,填补我国海洋及陆地边远地区预警信息发布空白。但北斗卫星预警信息发布存在传输速率低、冗余信息量大、长预警信息发布成功率低的问题。该文对北斗卫星预警信息发布系统的系统结构、协议体系和关键问题开展研究,通过指挥机并联、预警信息编码、影响区域识别、联合补包等方法,解决了北斗卫星预警信息发布系统建设的关键问题。在此基础上,该文设计了预警信息网络发布协议、预警信息北斗发布协议和预警信息北斗传输协议,并开发了原型系统。

深松作业远程管理系统设计与试验

为满足当前农田机械深松作业质量监控的需求,以北斗卫星定位和网络信息技术为基础,提出了一种实现远程深松作业信息采集、传输和管理的技术方案。利用移动通信技术和互联网技术对深松作业信息进行可靠传送,在监控终端利用Web技术和Browser/Server网络结构,实现底层控制网络与Internet的集成,建立深松作业远程管理系统。试验表明,该系统稳定可靠,既可实时获取工况信息又能进行作业面积统计,能够满足深松作业远程监测和管理的实际需要。