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2020年12月14日，中国科学院国家授时中心系统时间性能监测评估组监测到伽利略卫星导航系统（以下简称Galileo系统）时间发生异常，异常持续时间3小时左右。该小组监测发现，Galileo系统时间从UTC时间2020年12月14日0 时起（北京时间上午8点），部分卫星播发的时间信息存在无规律的跳变，导致监测到的系统时间出现异常。以UTC(NTSC)为参考，获得的Galileo系统时间（GST）相...
Further Development of Galileo-GPS RAIM for Vertical Guidance
Further Development Galileo-GPS RAIM Vertical Guidance
2015/6/25
With the much anticipated deployment of Galileo, a new partner will rise on the sky of Global Navigation Satellite Systems (GNSS). Equally anticipated is the launch of the modernized block III GPS sat...
In the next ten years the number of pseudorange sources and their quality is expected to increase dramatically:The United States is going to add two new civil frequencies (L5 and L2C) in the modernize...
Multiple Hypothesis RAIM with Real-Time FDE and Forecasted Availability for Combined Galileo-GPS Vertical Guidance
Multiple Hypothesis RAIM Real-Time FDE Forecasted Availability Galileo-GPS Vertical Guidance
2015/6/25
The number of ranging sources for the aviation user is expected to increase with the Galileo system becoming fully operational over the next decade, and the projected launch of a modernized GPS III co...
Fault Detection and Elimination for Galileo-GPS Vertical Guidance
Fault Detection Elimination Galileo-GPS Vertical Guidance
2015/6/25
In anticipation of the future launches of dual-frequency GNSS satellites, such as Galileo and GPS block III, a series of new developments has taken place in the field of Receiver Autonomous Integrity ...
Direct Comparison of the Multipath Performance of L1 BOC and C/A using On-Air Galileo and QZSS Transmissions
multipath BOC MBOC
2015/6/24
New Global Navigation Satellite System (GNSS) satellites will bring common, interoperable GNSS signals on L1.These new signals, L1C Global Positioning System (GPS)/Quasi-Zenith Satellite System (QZSS)...
Backup Hydrogen Maser Steering System for Galileo Precise Timing Facility
Backup Hydrogen Maser Steering System Galileo Precise Timing Facility
2009/9/3
Two hydrogen masers (HMs) are used in the Precise Timing Facility to provide the physical realization of Galileo System Time, insuring the extremely high short-term stability required for the navigati...
Joint L-/C-Band Code and Carrier Phase Linear Combinations for Galileo
Joint L-/C-Band Code Carrier Phase Linear Combinations Galileo
2009/9/3
Linear code combinations have been considered for suppressing the ionospheric error. In the L-band, this leads to an increased noise floor. In a combined L- and C-band (5010–5030 MHz) approach, ...
Comparison between Galileo CBOC Candidates and BOC(1,1) in Terms of Detection Performance
Galileo CBOC Candidates BOC(1,1) Detection Performance
2009/9/3
Many scientific activities within the navigation field have been focused on the analysis of innovative modulations for both GPS L1C and Galileo E1 OS, after the 2004 agreement between United States an...
Experimental Results for the Multipath Performance of Galileo Signals Transmitted by GIOVE-A Satellite
Multipath Performance Galileo Signals Transmitted GIOVE-A Satellite
2009/9/3
Analysis of GIOVE-A signals is an important part of the in-orbit validation phase of the Galileo program. GIOVE-A transmits the ranging signals using all the code modulations currently foreseen for th...
The Galileo Ground Segment Integrity Algorithms: Design and Performance
Galileo Ground Segment Integrity Algorithms Design Performance
2009/9/3
Galileo, the European Global Navigation Satellite System, will provide to its users highly accurate global positioning services and their associated integrity information. The element in charge of the...
Comparing Multicarrier Ambiguity Resolution Methods for Geometry-Based GPS and Galileo Relative Positioning and Their Application to Low Earth Orbiting Satellite Attitude Determination
Multicarrier Ambiguity Resolution Methods Geometry-Based GPS Galileo Relative Positioning Low Earth Orbiting Satellite Attitude Determination
2009/9/3
This paper presents an evaluation of several GNSS multicarrier ambiguity (MCAR) resolution techniques for the purpose of attitude determination of low earth orbiting satellites (LEOs). It is based on ...