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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, 541004, China 2.national {2. service Center, chinese academy of sciences, lintong 710600, China 3.key laboratory of precision navigation and timing technology, national {2. service Center, chinese academy of sciences, lintong 710600, China 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 technology

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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 {2. Center,chinese {3. of sciences,Xi’an 710600,China 2.key {13. of precision navigation and timing {12.,chinese {3. of sciences,Xi’an 710600,China 1. national time {2. 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 technology 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 technology 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 {2. Center chinese {3. of sciences Xi’an 710600 China 2.key {13. of precision navigation and timing {12. chinese {3. of sciences Xi’an 710600 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 technology and automatic control technology,this paper presents and studies aircraft automatic guidance technology 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 technology 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 technology 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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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 {2. Center, chinese academy of sciences, Xi’an {3., China 2. key laboratory of {13. navigation and timing technology, chinese academy of sciences, Xi’an {3., 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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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 MeiJun1,3.1{3. time {2. Center, chinese academy of sciences, Xi’an {3., China 2.5} laboratory of precision navigation and timing {13., chinese academy of sciences, Xi’an {3., China 3.raduate University of chinese academy of sciences, Beijing 10003., China 4Guilin University of Electronic {13., 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 {3. scale. When users positioning with not only one system, the {3. offset between them must be considered. There are several ways to acquire system {3. 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 {3. 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 {3. 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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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.{3. time {2. Center Xi’an 710600 P.R.China 2.key {3. of precision navigation and timing {13. chinese academy of {12. Xi’an 710600 P.R.China

With the "Regulations of the School Bus Safety（draft）" issued by the State Council at the end of 2.11,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 {2.,information {2.,data transmission {2.,electronic sensor {2.,information processing {2. 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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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 {2. Center Xi’an 710600 P.R.China 2. key {3. of precision navigation and {13. technology chinese academy of {12. Xi’an 710600 P.R.China 3. Beijing Institute of Tracking and Telecommunications technology No.2. 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 service 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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基于Vondrák滤波1阶差分灰色模型的卫星钟差预报方法

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天文学报 2018年第2期59卷 73-82页

作者：于烨张慧君李孝辉肖波陈婧亚葛玉龙中国科学院国家授时中心西安710600 中国科学院精密导航定位与定时技术重点实验室西安710600 中国科学院大学北京100049 中国科学院大学天文与空间科学学院北京100049

为了提高卫星钟差预报的精度,提出基于Vondrák滤波1阶差分的灰色模型算法.首先,对原始钟差数据序列采用Vondrák滤波处理后,得到1组新的钟差数据序列.然后,对相邻历元的钟差数据序列作1阶差分处理.最后,基于Vondrák滤波后的1阶差分的... 详细信息

为了提高卫星钟差预报的精度,提出基于Vondrák滤波1阶差分的灰色模型算法.首先,对原始钟差数据序列采用Vondrák滤波处理后,得到1组新的钟差数据序列.然后,对相邻历元的钟差数据序列作1阶差分处理.最后,基于Vondrák滤波后的1阶差分的钟差差值数据序列,建立了GPS钟差预报的灰色模型.此外,采用了IGS(International Global navigation Satellite System {2.)公布的精密卫星钟差数据进行了预报试验,通过与卫星钟差预报中常用的2.多项式模型和直接采用原始钟差数据建立灰色预报模型预报结果的对比分析,结果表明:该方法可以对GPS卫星钟差进行高精度的中短期预报.在12.h、16 h、2. h和2. h的平均预报精度分别为0.50 ns、0.85 ns、1.08 ns和1.2. ns,相比于2.多项式模型的平均预报精度分别提高了2..2.%、15.84%、12.90%和11.81%;相比于直接采用原始钟差数据建立灰色预报模型的平均预报精度分别提高了56.14%、49.40%、48.82.和47.80%.

关键词：天体测量学时间卫星钟差预报方法数据分析

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基于GM(1,1)和MECM组合模型的GPS卫星钟差中短期预报

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天文学报 2018年第3期59卷 17-28页

作者：于烨张慧君李孝辉肖波陈婧亚中国科学院国家授时中心西安710600 中国科学院精密导航定位与定时技术重点实验室西安710600 中国科学院大学北京100049 中国科学院大学天文与空间科学学院北京100049

针对卫星钟差呈现趋势项和随机项变化的特点,提出了基于GM(1,1)(灰色预报模型)和修正指数曲线法(Modified Exponential Curve Method,MECM)的组合预报模型.该模型首先采用GM(1,1)预报钟差的趋势项,然后利用MECM模型对GM(1,1)残差序列进... 详细信息

针对卫星钟差呈现趋势项和随机项变化的特点,提出了基于GM(1,1)(灰色预报模型)和修正指数曲线法(Modified Exponential Curve Method,MECM)的组合预报模型.该模型首先采用GM(1,1)预报钟差的趋势项,然后利用MECM模型对GM(1,1)残差序列进行建模和预报,最后将GM(1,1)和MECM模型的预报结果相加得到钟差的最终预报值.此外,采用IGS(International Global navigation Satellite System {2.)公布的精密卫星钟差进行预报试验,通过与卫星钟差预报中常用的二次多项式和MECM模型预报结果的对比分析,结果表明:该方法可以对GPS卫星钟差进行高精度的中短期预报.使用12.h钟差建模时,预报6 h、12.h、18 h和2. h的平均预报精度分别为0.43.ns、0.63.ns、0.74 ns和0.79 ns,相比于二次多项式的平均预报精度分别提高了57.43.、69.71%、80.47%和86.74%,相比于MECM模型的平均预报精度分别提高了50.57%、64.41%、76.80%和84.2.%;使用2. h钟差建模时,预报6 h、12.h、18h和2. h的平均预报精度分别为0.57 ns、0.61 ns、1.02.ns和1.48 ns,相比于二次多项式的平均预报精度分别提高了3.2}94%、55.47%、55.07%和53.16%,相比于MECM模型的平均预报精度分别提高了92.98%、66.3.%、65.42.和63.99%.

关键词：天体测量学时间方法数据分析

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附有高程约束的卫星导航系统精度因子分析方法

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时间频率学报 2018年第2期41卷 120-129页

作者：徐健武建锋中国科学院国家授时中心西安710600 中国科学院精密导航定位与定时技术重点实验室西安710600 中国科学院时间频率基准重点实验室西安710600 中国科学院大学北京100049 中国科学院大学电子电气与通信工程学院北京101408

高程约束定位方法是一种可以改善定位精度的方法,相对于最小二乘定位方法引入了地球椭圆约束方程。约束方程的引入改变了定位解算过程,使得来源于最小二乘定位方法的精度因子计算公式不再适用于新的方法。针对这一问题,从精度因子定义出... 详细信息

高程约束定位方法是一种可以改善定位精度的方法,相对于最小二乘定位方法引入了地球椭圆约束方程。约束方程的引入改变了定位解算过程,使得来源于最小二乘定位方法的精度因子计算公式不再适用于新的方法。针对这一问题,从精度因子定义出发,结合高程约束定位方法原理,提出一种新的计算高程约束定位精度因子的方法。利用某一监测站的地球同步轨道卫星和倾斜地球同步轨道卫星数据,进行了两组精度因子值分析试验和一组定位试验,试验结果表明提出的高程约束定位方法精度因子的计算方法是正确的,高程约束定位方法的定位精度也远高于最小二乘方法。

关键词：高程约束精度因子最小二乘

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