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A virtual reference satellite differential method for relative correction of satellite ephemeris errors

Science china(Physics,Mechanics & Astronomy) 2010年第12期53卷 2300-2306页

作者： CAI ChengLin 1.3 , LI XiaoHui 2,3 & WU HaiTao 2,3 1.Gulin University of Electronic technology, 541.04,{1. 2 national Time service center, chinese academy of sciences, lintong 71.600,{1. 3 key laboratory of precision navigation and timing technology, national Time service center, chinese academy of sciences, lintong 71.600,{1. 1. Gulin University of Electronic technology Gulin 541004 China3. Key Laboratory of Precision Navigation and Timing Technology National Time Service Center Chinese Academy of Sciences Lintong 710600 China2. National Time Service Center Chinese Academy of Sciences Lintong 710600 China

In order to solve the problems that the novel wide area differential method on the satellite clock and ephemeris relative correction (CERC) in the non-geostationary orbit satellite constellation, a virtual reference satellite (VRS) differential principle using relative correction of satellite ephemeris errors is proposed. It is referred to be as the VRS differential principle, and the elaboration is focused on the construction of pseudo-range errors of VRS. Through qualitative analysis, it can be found that the impact of the satellite’s clock and ephemeris errors on positioning can basically be removed and the users’ positioning errors are near zero. Through simulation analysis of the differential performance, it is verified that the differential method is universal in all kinds of satellite navigation systems with geostationary orbit (GEO) constellation, Medium orbit (MEO) constellation or hybrid orbit constellation, and it has insensitivity to abnormal aspects of a satellite ephemeris and clock. Moreover, the real time positioning accuracy of differential users can be maintained within several decimeters after the pseudo-range measurement noise is effectively weakened or eliminated.

关键词： wide area differential method virtual reference satellite (VRS) satellite ephemeris errors satellite clock errors constellation

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A study on volunteer augmentation navigation {1.

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Science china(Physics,Mechanics & Astronomy) 2011年第6期54卷 1029-1034页

作者： WU HaiTao 1,2,LU XiaoChun 1,2,ZOU DeCai 1,2 & HAN Tao 1,2 1 national Time service center,chinese academy of sciences,Xi’an 71.600,china 2 key laboratory of precision navigation and timing technology,chinese academy of sciences,Xi’an 71.600,china 1. national Time {1. center Chinese Academy of Sciences Xi’an 710600 China2. Key Laboratory of Precision Navigation and Timing Technology Chinese Academy of Sciences Xi’an 710600 China

navigation augmentation {1. is one of the most common methods to increase the continuity,reliability and integrity of the global satellite navigation *** concept of volunteer augmentation navigation (VNA) is proposed and the elements and topological structure of VNA are also analyzed in this *** study focuses on the neural network model that volunteers and ordinary users use modern communication information network to exchange self-organizing *** neural cell model of Volunteer Augmentation navigation using shared information is *** interactive general relative positioning is *** basic theories and methods of volunteer augmentation navigation are formed on the basis of the above-mentioned *** study of realization mechanism of volunteer augmentation {1. helps to form a relatively integral architecture of volunteer augmentation navigation.A user self-service satellite navigation augmentation which combines information exchange and navigation services may strengthen the continuity,reliability and integrity of the navigation *** volunteer augmentation navigation theory proposed in this paper improves the traditional satellite navigation application model and expands the connotation and denotation of satellite navigation augmentation methods.

关键词： volunteer augmentation navigation self-organizing information exchange interactive general relative positioning

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Research on AutoNav-Guiding technology for Airplane Taxiing

Research on AutoNav-Guiding Technology for Airplane Taxiing

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第三届中国卫星导航学术年会

作者： Wu Hai-tao1 2 Zou De-cai1 2 Han Tao1 2 Lu Xiao-chun1 2 1.national Time service center chinese academy of sciences Xi’an 71.600 china 2.key laboratory of precision navigation and timing technology chinese academy of sciences Xi’an 71.600 china

Aircraft taxiing on the ground can reach or leave from parking bay with the help of"FOLLOW ME"airport guide car,a process that requires a lot of manpower,material and financial *** the extensive use of Satellite-based navigation system and the rapid development of modern communication {1. and automatic control {1.,this paper presents and studies aircraft automatic guidance {1. to replace the airport guide car during airplane *** basic idea is that,based on the landing PVT information provided by GNSS navigation equipment onboard the aircraft,control tower planes aircraft taxiing routes after landing automatically according to airport GIS data and the actual airport flight schedule,and sends to the aircraft crew through wireless communication *** crew will match the real-time aircraft GNSS positioning information to the taxiing route provided by control tower using finite element theory coordinates matching *** matching results will be shown on the cockpit Multi-Function Display（MFD）or on the Head-up Display of windshield glass with the flashing arrows to guide the pilot taxiing under the established ***-guiding {1. occupies a certain advantage in the implementation complexity,cost,size and energy consumption compared to aircraft taxiing with the help of airport guide car,and auto-guiding {1. can also be used for the machine automatic guidance in the other places.

关键词： AutoNav-Guiding taxiing route finite element coordinates matching

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Application of GNSS in School Bus Safety Monitoring

Application of GNSS in School Bus Safety Monitoring

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第三届中国卫星导航学术年会

作者： HAN Tao1 2 LU Xiaochun1 2 ZOU Decai1 2 1.national Time service center Xi’an 71.600 P.R.china 2.key laboratory of precision navigation and timing technology chinese academy of sciences Xi’an 71.600 P.R.china

With the "Regulations of the School Bus Safety（draft）" issued by the State Council at the end of 201.,the management of school bus safety transportation has become a hot *** article puts forward a method of using Global navigation Satellite System（GNSS）to monitor the school bus *** school bus transport and management system,which is real-time,accurate and efficient,will be built up by integrate satellite positioning {1.,information {1.,data transmission {1.,electronic sensor {1.,information processing {1. and emergency services ***,the difference between the school bus monitoring and general vehicle monitoring is pointed ***,we find out the main reason is overload of passengers which cause the phenomenon of frequent school bus accident in ***,a School Bus Overloading Monitoring System（School-Bus-OMS）is designed to prevent the phenomenon of overload of *** that,the school bus safety monitoring system which based on GNSS and School-Bus-OMS is ***,a detailed description on the structure,function and rescuing measures of this system are given,and the corresponding mathematical models are established.

关键词： School Bus Safety GNSS Pressure Monitoring Mathematical Modeling

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Study on the Selection and Estimation of the Technique Index System of Time ＆ Frequency of Satellite navigation Systems

Study on the Selection and Estimation of the Technique Index...

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第三届中国卫星导航学术年会

作者： Ren Xiaoqian1,2, Hu Yu1,2, Wu Haitao1,2, Guo Wei1,2, Qin Weijin1,2 1. national Time service center, chinese academy of sciences, Xi’an 71.600, china 2. key laboratory of precision navigation and timing technology, chinese academy of sciences, Xi’an 71.600, china

The satellite navigation system is based on the measurements of time ＆ frequency to achieve distance, position and velocity measurements. The positioning is one of the functions of the satellite navigation system. The paper is based on the analysis of working principle of the satellite navigation system and the characteristic of strong relevance of the technique index system. The technique index system to achieve the function of positioning is analyzed and discussed gradually. Meanwhile,the paper estimates the rationality of selected technique index system with the method of calculating relativity. Finally, the set of technique indexes to achieve the function of positioning restricted to the control of the main control station is determined. The achievement of the paper could provide the thought to design the system or test and estimate the satellite navigation system.

关键词： Time & Frequency Satellite navigation System Technique in- dex.

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Interoperability Feasibility Analysis between Beidou and GPS

Interoperability Feasibility Analysis between Beidou and GPS

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第三届中国卫星导航学术年会

作者： LU Xiaochun 1 2 LU Jun 3 WANG Xue 1 2 BAI Yan 1 2 4 HAN Tao 1 2 * 1. national Time service center Xi’an 71.600 P.R.china 2. key laboratory of precision navigation and timing technology chinese academy of sciences Xi’an 71.600 P.R.china 3. Beijing Institute of Tracking and Telecommunications technology No.26 Beiqing road Haidian district Beijing china 4. Graduate School of the chinese academy of Science Beijing 100040 P.R.china

Interoperability has become a focus of Global navigation Satellite System （GNSS） and a development aspect, and incurs much focus among the world. For the purpose of maximum benefit, a series of interoperability researches and cooperation are putting forward. In this paper, according to the development of Beidou and GPS, we analyzed the interoperability feasibility between them as three phases. First of all, we introduced the signal plane of Beidou and GPS, separated their interoperability into three phases. After that, we analyzed the signal performance and {1. performance during each phases. Finally, based on the analyzing results, we offer a reference for Beidou signal design.

关键词： Interoperability signal performance service performance GDOP

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System time offset based RAIM in combined GPS/Beidou navigation system

System time offset based RAIM in combined GPS/Beidou navigat...

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第三届中国卫星导航学术年会

作者： XU LongXia1,2,3*1, LI XiaoHui1,2, XUE YanRong1,2,3, CAI ChengLin4& GUO MeiJun1,3 1national Time service center, chinese academy of sciences, Xi’an 71.600, china 2key laboratory of precision navigation and timing technology, chinese academy of sciences, Xi’an 71.600, china 3Graduate University of chinese academy of sciences, Beijing 100039, china 4Guilin University of Electronic technology, Guilin, 541004, china

Compatibility and interoperability of GNSS （Global navigation Satellite System） are becoming the main trend of future navigation. However, each navigation system has a time scale. When users positioning with not only one system, the time offset between them must be considered. There are several ways to acquire system time offsets. By adding unknown variables in the combined position equation to solve this variable is the commonly used way. For positioning with multi-constellations, system time offsets are some kind of burden which must be taken into account. This paper takes full use of the obtained offsets and proposes a new fault detection method for RAIM （Receiver Autonomous Integrity Monitoring）. Simulations are made to estimate the ability of this new method. This new method takes the high stability of system time offsets of GPS/Beidou system and applies it to assistant fault detection. This method has no additional requirements for navigation system and is fit for applied in receivers. It can be expected this method will be one means of RAIM for Beidou navigation system when integrated with other GNSS in future.

关键词： Compatibility and Interoperability Time Offset Receiver Autonomous Integrity Monitoring Fault Detection.

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Design of new intelligent street light control system

Design of new intelligent street light control system

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2009年中国智能自动化会议

作者： WU Yue~(1.2),SHI Changhong~3,LI Yan~1.ZHANG Wen-dong~1.(1.national {1. laboratory for Electronic Measurement technology, North University of china,Taiyuan 030051.china 2 The Mechanical and Electronic Engineering College, North University of china,Taiyuan 030051.china 3 The Quartermaster Institute of the General Logistics Department of the P.L.A, Beijing 1.001.,china)

In china,the methods of time-control,optical-control and time-optical-control are in common used to control street lamp,particularly in small and medium-sized cities. But the {1. is bad,and the result of work is also *** main reason is the backward lighting control and administrative method. Through many kinds of sensor combination sense environment’s change,the multi-sensor exhibition can combinatory logically control the new intelligent street light controller *** based on the degree of illumination control fixed time,in the automatic foundation fixed time,according to the multi-sensing exhibition survey data’s special combination change,to control the street light nimbly;the system can also realize the automatic timing control,by the preinstall time to control street light switch,ultimately, to control the street light timed;Simultaneously can also realize the automatic sunshine control,which may act according to the actual determination the sunlight degree of illumination and the degree of illumination control criterion,automatic control street light. On the basis of the merits both the regular control and the optical control,a new street smart controller is designed,with dual functions both timing control and automatic photoelectric *** allows street lamps automatic lit in the evening,lighting the road for a few hours(adjustable time).After 0:00,when few vehicles or pedestrians go past,it turn off *** terminal controller has wake-up *** the street light turn out automatically,when the vehicles or pedestrians are going through,street light will be waken up by terminal controller,When the vehicles or pedestrians past,the light *** of new intelligent street light control system does not only achieve energy-saving power but also extend the service life of lighting ***,it is controllable,ease of *** the same time,it is helpful to highlight the festive and other characteristics,an

关键词： Public street lighting intelligent controller

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超稳光生微波源研究进展

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物理学报 2018年第16期67卷 71-93页

作者：姜海峰中国科学院国家授时中心中国科学院时间频率基准重点实验室西安710600 中国科学院大学天文与空间科学学院北京100049

随着科技的进步以及精密测量应用技术的不断提高,超稳微波源的稳定度和噪声水平等技术要求不断提高,应用范围愈加广泛,包括高性能频标研究、网络雷达研制、深空导航系统等方面.基于超稳激光和飞秒光梳的超稳光生微波源是目前频率稳定度... 详细信息

随着科技的进步以及精密测量应用技术的不断提高,超稳微波源的稳定度和噪声水平等技术要求不断提高,应用范围愈加广泛,包括高性能频标研究、网络雷达研制、深空导航系统等方面.基于超稳激光和飞秒光梳的超稳光生微波源是目前频率稳定度最高的微波频率源,相对频率稳定度可达1.^(1.)@1.s量级.该装置也是未来频率标准(光频标)推广应用的基础,无论是时间的产生还是绝大多数的精密测量,都需要将光频标的输出激光变换为超稳的基带频率信号后才能够实现.本文介绍了超稳光生微波源技术的发展、现状和应用需求.以国家授时中心研制的国内首套超稳微波频率源技术为主线,介绍了超稳光生微波源的原理和结构以及各组成部分的技术发展情况:超稳激光方面,着重介绍超稳光学腔研究和研制的进展以及Pound-Drever-Hall锁频技术、剩余幅度调制等噪声抑制技术;飞秒光梳方面,着重介绍目前最常用的掺铒光纤光梳系统的激光锁模、频率控制等技术发展;低噪声光电探测方面,着重介绍宽带光电探测噪声抑制技术和激光幅度噪声引起微波相位噪声的抑制技术.最后对光生超稳微波技术进行了总结和展望.

关键词：频率稳定度相位噪声超稳激光飞秒光梳

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A novel x-ray circularly polarized ranging method

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chinese Physics B 2015年第5期24卷 503-513页

作者：宋诗斌许录平张华高娜申洋赫 School of Aerospace Science and technology Xidian University Shandong Institute of Aerospace Electronics

Range measurement has found multiple applications in deep space missions. With more and further deep space ex- ploration activities happening now and in the future, the requirement for range measurement has risen. In view of the future ranging requirement, a novel x-ray polarized ranging method based on the circular polarization modulation is proposed, termed as x-ray circularly polarized ranging （XCPolR）. XCPolR utilizes the circular polarization modulation to process x-ray signals and the ranging information is conveyed by the circular polarization states. As the circular polarization states present good stability in space propagation and x-ray detectors have light weight and low power consumption, XCPolR shows great potential in the long-distance range measurement and provides an option for future deep space ranging. In this paper, we present a detailed illustration of XCPolR. Firstly, the structure of the polarized ranging system is described and the signal models in the ranging process are established mathematically. Then, the main factors that affect the ranging accuracy, including the Doppler effect, the differential demodulation, and the correlation error, are analyzed theoretically. Finally, numerical simulation is carded out to evaluate the performance of XCPolR.

关键词： x-ray ranging circular polarization modulation deep space regenerative ranging

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