北斗在国际海事组织开展标准化工作初探

本文依据北斗卫星导航系统在航海领域应用的规划和考虑,介绍了国际海事组织(IMO)卫星导航标准现状以及对GNSS的政策与发展规划,阐释了航海领域制定GNSS相关标准现状及发展趋势,分析了北斗卫星导航系统开展IMO国际标准化工作的机遇与挑战,并给出了北斗卫星导航开展在IMO国际标准化工作的初步考虑与建议。     

北斗在国际海事组织开展标准化工作初探

本文依据北斗卫星导航系统在航海领域应用的规划和考虑,介绍了国际海事组织（IMO）卫星导航标准现状以及对GNSS的政策与发展规划,阐释了航海领域制定GNSS相关标准现状及发展趋势,分析了北斗卫星导航系统开展IMO国际标准化工作的机遇与挑战,并给出了北斗卫星导航开展在IMO国际标准化工作的初步考虑与建议。     

资讯

正全国北斗卫星导航标准化技术委员会成立4月28日,国家标准委和总装备部联合批复成立的全国北斗卫星导航标准化技术委员会成立大会在北京召开,这是我国第一个军民共建的标准化技术组织。国家标准委主任田世宏、总装备部电子信息部部长辛毅出席会议并讲话。田世宏指出,加强北斗卫星导航标准化工作是贯彻落实党中央、国务院和中央军委"军民融合深度发展"战略部署的重要举措,是推动北斗卫星导航系统     

全国北斗卫星导航标准化委员会成立

2014年4月28日,全国北斗卫星导航标准化技术委员会（以下简称“北斗标技委”）成立大会暨第一次全体工作会议在京召开。会上宣读了《国家标准委总装备部关于成立全国北斗卫星导航标准化技术委员会的通知》,听取了《北斗卫星导航标准化工作汇报》,并讨论了《全国北斗卫星导航标准化技术委员会章程》（草案）,     

资讯

<正>全国北斗卫星导航标准化技术委员会成立4月28日,国家标准委和总装备部联合批复成立的全国北斗卫星导航标准化技术委员会成立大会在北京召开,这是我国第一个军民共建的标准化技术组织。国家标准委主任田世宏、总装备部电子信息部部长辛毅出席会议并讲话。田世宏指出,加强北斗卫星导航标准化工作是贯彻落实党中央、国务院和中央军委"军民融合深度发展"战略部署的重要举措,是推动北斗卫星导航系统     

北斗卫星导航定位技术写入移动通信国际标准——访中国通信标准化协会副秘书长 武冰梅

正日前,中国通信标准化协会副秘书长武冰梅在接受本刊记者采访时表示,我国北斗卫星导航定位技术写入移动通信国际标准组织3GPP国际标准,实现了北斗标准在移动通信国际领域的重大突破。武冰梅表示,长期以来,移动通信的导航和定位均采用的是GPS等国外技术,这些技术都控制在欧美等国家手中。伴随着我国北斗卫星导航系统的自主研     

网络辅助北斗导航定位技术与测试方法

主要介绍了北斗卫星导航与移动通信融合的应用现状,梳理了目前智能终端广泛使用的网络辅助北斗导航定位技术的国内外标准化进展情况,并对网络辅助北斗导航定位性能相关检测技术与测试方法进行了研究。     

北斗IEC国际标准化工作初探

本文基于开展北斗加入IEC的国际标准化工作的迫切需要,阐释了卫星导航技术在IEC的发展现状以及船载GNSS接收机检测标准在IEC的研究和制定情况,结合北斗当前建设实践及国际应用推广进展,深入分析了我国开展北斗加入IEC国际标准化工作所面临的机遇与挑战,并就文件准备、设备研制、参会保障、外交公关等相关工作提出意见和建议。     

第十二届中国卫星导航年会召开

正2021年5月26日,第十二届中国卫星导航年会在江西南昌召开。年会以"时空数据,赋能未来"为主题,全面展示了卫星导航时空服务对未来发展的重要意义,推动北斗系统与各领域深入融合。本次年会集中展示了北斗系统融合应用成果。上海市计量测试技术研究院展示了国家时间频率计量中心上海实验室的技术能力和服务范围。其中,网约车计程计时检测、卫星信号模拟器校准、北斗船载接收机检测、北斗应急无线电示位标检测等特色服务项目以及标准化工作,受到了业内客户的好评。     

标准体系构建方法研究——以北斗卫星导航系统为例

随着信息化技术的发展和卫星导航系统建设的不断加快,北斗卫星导航系统的产业化和巨大的应用服务需求对标准体系的建设提出了迫切的要求。在对已有文献梳理的基础上,通过对卫星导航标准体系构建方法的比较分析,并结合标准体系的构建方法,概括提出了北斗卫星导航标准体系的构建原则、构建流程,为北斗卫星导航或其他系统标准体系的构建提供参考。     

基于卫星导航信号模拟仿真法的北斗接收机导航精度校准测试

随着我国自主设计的北斗卫星导航系统稳步建设,北斗接收机相关技术取得突破,但当前北斗接收机校准体系尚不完善,相关测试方法亟待研究。本文提出卫星导航信号模拟测试法,通过多星座导航信号模拟器设计静态、动态等仿真场景模拟相关载体运动状态下真实的卫星信号,实现对北斗接收机在相关载体运动状态下导航精度的校准测试。该方法具有准确度高、简单易操作和重复性强等优点,可实现实验室条件下检测接收机性能。实验结果表明:北斗系统的定位和测速精度已基本接近GPS系统,但就系统的稳定性,北斗系统与GPS系统相比还存在一定差距。     

Formal Specification and Quantitative Analysis of a Constellation of Navigation Satellites

Navigation satellites are a core component of navigation satellite‐based systems such as Global Positioning System, Global Navigation Satellite System and Galileo, which provide location and timing information for a variety of uses. Such satellites are designed for operating on orbit to perform tasks and have lifetimes of 10 years or more. Reliability, availability and maintainability analysis of systems has been indispensable in the design phase of satellites in order to achieve minimum failures or to increase mean time between failures and thus to plan maintenance strategies, optimise reliability and maximise availability. In this paper, we present formal models of both a single satellite and a navigation satellite constellation and logical specification of their reliability, availability and maintainability properties, respectively. The probabilistic model checker PRISM has been used to perform automated analysis of these quantitative properties. Copyright © 2014 John Wiley & Sons, Ltd.     

RNSS射频基带一体化芯片测试方法研究

随着卫星导航产业的快速发展,导航芯片成为民用卫星导航应用的核心竞争力。拥有诸多优势的射频基带一体化芯片是导航芯片发展的主流方向之一,本文依托某应用推广项目,对国产的该类芯片进行测试验证,通过不同模态下对其定位精度和跟踪灵敏度的考核,验证了芯片的基本功能,对该类芯片的测试方法进行了初步研究。     

Consistency of MGEX Orbit and Clock Products

The analysis centers of the Multi-GNSS Pilot Project of the International GNSS Service provide orbit and clock products for the global navigation satellite systems (GNSSs) Global Positioning System (GPS), GLONASS, Galileo, and BeiDou, as well as for the Japanese regional Quasi-Zenith Satellite System (QZSS). Due to improved solar radiation pressure modeling and other more sophisticated models, the consistency of these products has improved in recent years. The current orbit consistency between different analysis centers is on the level of a few centimeters for GPS, around one decimeter for GLONASS and Galileo, a few decimeters for BeiDou-2, and several decimeters for QZSS. The clock consistency is about 2 cm for GPS, 5 cm for GLONASS and Galileo, and 10 cm for BeiDou-2. In terms of carrier phase modeling error for precise point positioning, the various products exhibit consistencies of 2–3 cm for GPS, 6–14 cm for GLONASS, 3–10 cm for Galileo, and 10–17 cm for BeiDou-2.     

国际标准化:来自日立制作所的实践与启示

国际标准化是日立公司的标准化战略,机理标准化和整体技术优势标准化是日立公司的两个新的标准化方法,智慧城市和环境领域标准化是其关注重点。     

The performance comparison between GPs and BeiDou‐2/compass: A perspective from Asia

Abstract

The next decade promises drastic improvements to global navigation satellite systems. The USA is modernizing GPS, Russia is refreshing GLONASS, Europe is moving ahead with its own Galileo system, and The People's Republic of China is expanding its BeiDou‐1 system from a regional navigation system to a full constellation global navigation satellite system known as BeiDou‐2/Compass, which consists of thirty five satellites including geostationary satellites, MEO satellites and geosynchronous satellites in the coming year. Extra satellites will make possible improved performance for all applications, and especially where satellite signals can be obscured, such as in urban canyons, under tree canopies or in open‐pit mines. The benefits of the expected extra satellites and their signals can be evaluated in terms of availability, accuracy, continuity, and reliability issues.

The advent of a hybrid GNSS constellation has drawn a lot of attention to study compatibility and interoperability. A number of performance analyses have been conducted on a global scale with respect to availability, reliability, accuracy and integrity in different simulated scenarios (such as open sky and urban canyons) for each system individually as well as for combined systems with all the possible combinations. Since the BeiDou‐2/Compass has gained more attention from GNSS communities, the main objective of this paper is to study the performance of BeiDou‐2/Compass comparied to GPS in the greater Asia region; and also to explore whether the combination of BeiDou‐2/Compass with GPS would yield performance improvements in this region.

The performance analysis can be analyzed by either the signal or the geometrical conditions. However, the scope of this study is limited to investigating the impact of current and future GNSS based on geometrical conditions. Therefore, the satellite visibility and DOP (Dilution of Precision) values of each system or possible combinations between them are used as the major indices for performance evaluation with the emphasis on the addition of Compass. In addition, those indices are further analyzed in terms of their spatial and temporal distributions with the emphasis on the greater Asia region. Moreover, the spatial performance analyses are conducted on both global and regional scales to provide more insightful comparisons to illustrate the importance of future Compass for users in the greater Asia region.     

Kernel Entropy Based Extended Kalman Filter for GPS Navigation Processing

This paper investigates the kernel entropy based extended Kalman filter (EKF) as the navigation processor for the Global Navigation Satellite Systems (GNSS), such as the Global Positioning System (GPS). The algorithm is effective for dealing with non-Gaussian errors or heavy-tailed (or impulsive) interference errors, such as the multipath. The kernel minimum error entropy (MEE) and maximum correntropy criterion (MCC) based filtering for satellite navigation system is involved for dealing with non-Gaussian errors or heavy-tailed interference errors or outliers of the GPS. The standard EKF method is derived based on minimization of mean square error (MSE) and is optimal only under Gaussian assumption in case the system models are precisely established. The GPS navigation algorithm based on kernel entropy related principles, including the MEE criterion and the MCC will be performed, which is utilized not only for the time-varying adaptation but the outlier type of interference errors. The kernel entropy based design is a new approach using information from higher-order signal statistics. In information theoretic learning (ITL), the entropy principle based measure uses information from higher-order signal statistics and captures more statistical information as compared to MSE. To improve the performance under non-Gaussian environments, the proposed filter which adopts the MEE/MCC as the optimization criterion instead of using the minimum mean square error (MMSE) is utilized for mitigation of the heavy-tailed type of multipath errors. Performance assessment will be carried out to show the effectiveness of the proposed approach for positioning improvement in GPS navigation processing.     

基于北斗导航定位系统改进技术的定位误差仿真和分析研究

对北斗导航定位系统、使用三星定位技术及伪卫星技术的定位误差进行了仿真分析.通过仿真和分析表明,三星定位技术虽然解决了原有系统的缺陷,但存在定位精度的问题;而伪卫星技术不仅解决了原有系统的缺陷,同时提高了定位精度.     

Ground resource optimization for navigation constellation based on satellite link scheduling

The Global Navigation Satellite System (GNSS) provides autonomous geospatial positioning and time synchronization services for civilian and military purposes. GNSS satellite links are used to transmit signals for constellation management and other applications. To minimize the number of stations required in participant ground-based management and reduce management costs in the GNSS network, this study solves the satellite link scheduling problem over the dynamic satellite network, including the hybrid and fast-varying inter-satellite link (ISL) working system. Firstly, the management problem is divided into two phases. Secondly, a two-level solving scheme is designed according to the characteristics of the scheduling problem. Finally, a performance analysis of different scenarios is conducted. The experimental results show that the hybrid ISL working system provides more effectively utilized data transmitting bandwidth of satellite links, thereby reducing the use of ground-based management resources. This study provides a technical reference for the management of future large-scale satellite networks.