北斗智能物流终端在物联网领域的应用研究

北斗导航系统建设已经初具规模,物流行业蓬勃发展、北斗导航技术目趋成熟、智能手持设备已经普及,北斗智能物流终端的发展迎来了前所未有的发展机遇。本文讨论北斗导航系统和物联网结合的必然性,并从物联网的组成结构出发,讨论北斗智能物流终端在物联网中的应用;重点讨论了北斗智能物流终端在物流领域的应用,并针对现有物流体系提出北斗智能终端的应用场景。通过研究发现,北斗系统在未来必将迎来高速发展,并将广泛应用于物流领域,而未来的物流终端将广泛采用北斗作为定位和应急通信系统。     

车载GPS/北斗/DR组合导航系统研究

针对移动车辆的定位与导航问题,研究了GPS/北斗/DR组合导航算法.文中采用坐标系变换及增加状态变量法对不同卫星星座进行了时空统一,并在此基础上研究了GPS/北斗卫星组合导航算法;为了克服卫星定位存在的不连续性问题,提出了GPS/北斗卫星导航系统与低成本的航位推算系统组合导航方案,设计了GPS/北斗/DR组合导航滤波器...     

辅助型北斗定位技术及其应用

随着在微弱卫星信号环境下应用需求的增长以及对首次定位时间和定位精度的要求,一种高性能的卫星定位技术——辅助型全球卫星导航系统(A-GNSS)定位技术成为导航领域的研究热点。文中针对中国自主开发的北斗导航系统,探讨了辅助型北斗定位(A-Beidou)的技术原理、操作方法和需要攻克的难题;以手持终端设备为例说明A-Beidou技术的具体应用及发展前景。     

北斗导航智能升级电子信息产业迎来巨大商机

在7月30日举行的“战略性新兴产业（滨海）国际论坛”上,北斗卫星导航系统成为主要议题。中国卫星导航定位协会咨询中心主任曹冲表示．北斗卫星导航系统未来将成为汽车制造业、移动通信业、先进软件业、综合数据业、移动互联网位置服务和所有电子信息终端的标准配置。     

华力创通 创新为生存之本

备受瞩目的第四届中国卫星导航学术年会5月15日在武汉开幕,本届年会的主题是"北斗应用——机遇与挑战"。来自国内外卫星导航系统主管部门和卫星导航领域知名专家学者以及企业家,通过学术交流、高端论坛、展览展示和科学普及等一系列活动,分享学术研究的最新收获,展示卫星导航应用最新成果,探讨卫星导航应用服务模式,谋划卫星导航产业未来发展。华力创通作为北斗应用领域的先行者,凭借多年来在导航领域的技术积累,秉承"创新为生存之本"的理念,在本届年会中全新推出了一款具有北斗导航定位与北斗卫星短报文通信功能的智能手持终端,     

便携式北斗通信定位终端系统的研究与设计

为了保障在应急情况下数据信息的正常传输和通信能力,利用北斗卫星导航系统的导航定位、短报文通信功能,研究并设计了基于微控制器的便携式北斗通信定位终端系统。通信定位终端以STC89C52RC微处理器为控制核心,通过串口与通信定位模块进行命令和数据通信,文中研究了系统的软硬件详细设计,对通信协议进行了详细解析,研究了汉字短信息的输入方法,并给出了系统实验测试结果,测试结果表明：系统能够运行稳定、可靠,可作为公共网络通信的重要补充和应急通信方式。文中研究的北斗通信定位终端系统对应用北斗短报文进行通信监视的系统设计具有较好的借鉴意义。     

基于北斗的多系统组合定位方法研究

基于多系统组合的导航定位技术应用日益广泛,采用多系统组合导航克服了单一星座系统定位中存在的定位精度差、可见星少、可靠性低等问题。本文提出了基于北斗卫星导航系统的多系统组合定位方法,详细推导了基于北斗的多系统组合用户定位算法模型。比较分析了单一北斗卫星导航系统和北斗、GPS、Galileo 多系统组合条件下服务性能,得出在多系统组合条件下可以极大改善用户观测条件,进而提高了用户导航定位使用效能。     

北斗卫星导航系统在民用领域中的典型应用

北斗卫星导航系统是中国自主研发的导航系统,它具有中国的自主产权,不但具备定位导航功能,还具备通信功能.目前为止,北斗卫星导航系统被广泛应用于各行业当中,大到军事勘察,小到出行导航.随着北斗二号卫星系统的建设,北斗卫星导航系统功能增强,应用范围扩大,北斗卫星导航系统在导航定位中的作用越来越突出.本文主要研究北斗卫星导航系统的定位原理,分析其在个人位置服务领域中的应用.     

基于北斗终端的室内外无缝定位系统设计

针对当前室内外无缝连续定位问题,基于北斗空间导航信号特征,并结合WLAN室内定位中的Radio Map的思想,提出了一种基于北斗终端的室内外无缝导航定位系统,使现有的北斗导航终端只需要经过软升级,即可实现室内外无缝定位。仿真结果表明,在空旷室内环境与复杂室内环境下,均达到了2 m的定位精度(1σ),且在室内外过渡中保证了定位的连续性。本系统为解决北斗导航系统全域覆盖问题提出了一种可行的技术思路。     

基于北斗的应急通信技术研究及系统设计

基于对卫星通信的应急通信技术的分析，结合中国拥有完整知识产权的北斗卫星导航系统的应用，设计并实现了一套基于北斗卫星导航技术的应急通信系统，由北斗卫星、信息采集终端、 信息运行中心和控制中心等组成，集定位、导航、短报文通信功能于一体，为抢险救灾中的应急通信提供了一种技术保障手段。     

Inertial navigation

Inertial Navigation Systems have found universal application both militarily and commercially. They are self-contained, nonradiating, nonjammable, and sufficiently accurate to meet the requirements of users in a most satisfactory manner. An overview of inertial navigation is provided, followed by several sections detailing a specific, but different mechanization approach. A Ring Laser Gyro (RLG) based navigation system design is reviewed with special emphasis directed at requirements for navigation accuracy and alignment time. Along with discussions of the RLG unit, an introduction to a novel accelerometer approach, the Vibration Beam Accelerometer (VBA), is provided. A gimballed, self-contained High Accuracy Inertial Navigation System, denoted HAINS, represents one approach toward achieving navigation capability of 0.2 nmi / h and an rms velocity of 1.5 ft / s per axis while retaining the form and fit and affordability of standard inertial tactical flight navigators. The Stellar-Inertial Navigation section illustrates the bounding of position and verticality errors thus achieving exceptional accuracies. Two gyroscopic approaches, presently in development are finally discussed. The Fiber Optic Gyroscope (FOG) and Magnetic Resonance Gyroscopes (MRG's) are of interest for navigation because of their potential for low cost and excellent reliability.     

Image-based wafer navigation

Microscopic imaging is used in most core technology processes where integrated circuit (IC) digital images reveal important information. We present a new method for navigation on wafers that is based on localization of microscopic eye-point images using a previously acquired wafer map. It is fast enough for in-line microscopy and robust to visual changes occurring during the manufacturing process, such as contrast variation, rescaling, rotation, and partial feature obliteration. The method uses geometric hashing, a highly efficient technique drawn from the object recognition field. This approach proved to be highly reliable when tested on typical wafer images.     

Computers for navigation

This paper discusses the application of personal, portable computers and calculators to ship instrumentation. The characteristics which should be considered when purchasing a computer are discussed and algorithms for implementing certain often-omitted but necessary functions are given.     

Computers and navigation

Navigation has always relied on data collection, processing, and computation. The aplication of modern computers and microprocessors to this field dramatically highlights the interdependance. Nevertheless, there is much to be accomplished to close a "processing gap" that has opened up, especially in the field of marine navigation. More on-line, real-time processing of data gathered on-board small pleasure vessels is possible by using inexpensive sensors and microprocessors. Database management techniques on-board large vessels can be used to reveal potentially dangerous changes in aids to navigation; advanced communication methods can be used to Update the navigation database. When modern navigation methods are employed in millions of land-based vehicles, the economic incentives to introduce improvements will sharply increase; hundreds of thousands of marine users will benefit from the larger supply of hardware and software that will appear in this marketplace.     

北斗/罗兰组合导航系统中伪距导航定位解算新算法研究

为提高北斗／罗兰组合导航系统伪距导航定位解算的精度和改善对动态目标的实时跟踪,本文提出了一种新方法,采用镜像映射法解具有病态的矛盾方程组以提高精度,以及将伪距导航定位解算方程模型转换为具有贯序输入输出数据的系统辨识模型,然后用递推最小二乘法,对所求的北斗／罗兰组合导航系统伪距导航定位信息一接收机的三维位置参数和时钟误差参数进行动态快速实时估计。     

惯性/卫星导航系统实际导航性能评估算法

针对惯性/卫星组合导航进行实际导航性能(Actual Navigation Performance,ANP)评估,是保证飞机所需导航性能(Required Navigation Performance,RNP)及航空运行安全的关键。提出了惯性/卫星组合导航系统实际导航性能评估算法,从卡尔曼滤波器位置协方差矩阵开展分析,结合导航数据二维高斯分布特性,求解出标准误差椭圆。根据概率分布特性,将误差椭圆转换为95%概率误差圆,进而计算出ANP值。最后惯性/卫星组合导航数据进行仿真验证。结果表明,方法切实可行,且便于工程实践。     

用于组合导航系统的三轴地磁导航传感器设计

文章针对仿生偏振光/地磁/惯导多源信息组合导航系统中的地磁导航需求,设计了一种三轴地磁导航传感器。介绍了应用背景、设计需求与实现方法,进行了系统的误差分析,并针对不同误差来源,进行了标定测量与补偿,实现了三轴姿态角的动态测量,为多信息源融合下的导航系统提供了一种获取地磁导航信息的有效手段。     

Fundamentals of proportional navigation

Proportional navigation has proved to be a useful guidance technique in several surface-to-air and air-to-air missile systems for interception of airborne targets. In this article, which is tutorial in nature, the basic theory of proportional navigation is presented and clarified. In addition, two variations on this guidance method are treated: one in which the commanded acceleration is biased by a small value of the measured rotational rate of the line of sight between the interceptor and its target, and one in which the line-of-sight rotational rate is reduced to a prescribed value (dead space) and then maintained at this rate until intercept. The analysis is directed, by example, to the case of the exoatmospheric interception of a satellite; however, the guidance theory presented is also applicable to the intercept of a nonmaneuvering airborne target.