Ground Environment Test and In-Orbit Performance Verification of Spaceborne Cesium Atomic Clock
Jun YangNing ZhengCui Jing-zhongShiwei WangWei YangPei MaLiu ZhidongJiang ChenY. MaYulong ZhaoLiangyu HuangPengling Dong
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GLONASS
Adaptability
Orbit (dynamics)
Ground-based GNSS reflectometry (GNSS-R) systems can be realized by different means. The concept of correlation between direct and reflected GNSS signals is basically possible with all GNSS systems. However, using signals from the Russian GLONASS system simplifies the signal processing so that software-defined radio (SDR) components can be used at replace expensive hardware solutions. This paper discusses how such a solution, called GLONASS-R, can be realized using entirely off-the-shelf components. Field tests with such a system demonstrate the capability to monitor sea surface heights with a precision of 3 cm or better even with a sampling rate of 1.5 Hz. The flexibility of a SDR and the simple concept of GLONASS-R allow build such a system with low costs and adapt it to the needs of any ground-based GNSS-R problem.
GLONASS
Reflectometry
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GNSS systems contain GPS,GLONASS,GALILEO and BDS etc.For the navigation users,using them together is very helpful to increase the number of the satellite that can be seen,and improves satellite distribution.So it plays a significant role in building area ionosphere model.Since GNSS systems have not been fully completed,the dual-frequency observations of GPS,GLONASS,GALILEO and BDS should be simulated,based on which the model of the ionosphere spherical harmonics is built,also the regional model results are analyzed,and some conclusion remarks are given finally.The simulation result shows that the mean accuracy of the ionosphere spherical harmonics model building by GNSS systems is better than that of single system in China.The model errors of BDS and GNSS are similar,which only account for 14% of the actual delay maximum,and better than that of GPS which is 20% maximum.While the result of GLONASS is the worst,the model error of which can even account for 35% of the actual delay.
GLONASS
Galileo (satellite navigation)
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GPS, GLONASS, Galileo, BeiDou and other Global Navigation Satellite Systems provide high-accuracy positioning and timing to overland, marine, airborne and other kinds of users. For GNSS interoperability it is necessary to provide users with the values of the offsets between GNSS time scales. Thus, GNSS-GNSS Time offset monitoring is an essential issue. The paper analyzes the available methods of GNSS-GNSS Time offset independent monitoring "from outside" and the feasibility of using the data provided by Bureau International des Poids et Mesures BIPM on UTC/UTCr time scales for calculating GNSS-GNSS Time offsets. The results of GNSS-GNSS Time offset monitoring at Russian Institute of Radionavigation and Time are presented.
GLONASS
Air navigation
Galileo (satellite navigation)
UTC offset
Precise Point Positioning
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In this chapter we examine how GNSS signals are created. We mostly concentrate our presentation on the signals of currently operating GPS and GLONASS. We also consider the main specific features of future GNSS signals including modernized GPS, modernized GLONASS, and GALILEO. We also describe in this chapter how GNSS signals are generated in simulators and how those signals differ from the signals generated by satellite transmitters and pseudolites. The particular place which this chapter occupies in the book is schematically depicted on Figure 3.1. In this book we describe GNSS using some help from a GNSS signal simulator. GNSS simulation today has become an important and significant part of the GNSS technology, which enjoys a high demand. Further, any presentation is based on models. These models can be mathematical, empirical, or speculative. A simulator-based model provides one with the best combination of those models, being as close to the real system from a receiver point of view as possible.
GLONASS
Galileo (satellite navigation)
SIGNAL (programming language)
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본 논문은 GNSS(GPS, GLONASS, GALELEO, BEIDOU) 신호가 도달하지 않는 실내, 지하 터널과 같은 장소에서 활용 가능한 GNSS 신호 발생 기술이 일반 GNSS 수신기의 정상 동작에 효과적일 뿐만 아니라 GNSS/DR, GNSS/INS와 같이 혼합측위 또는 복합측위를 수행하는 솔루션에도 활용될 수 있음을 이론적인 접근과 실제 터널환경에서 현장실험을 통해 성능이 개선된 결과를 입증하였다. 본 연구를 통해 GNSS 신호발생기는 GNSS 측위장치 뿐만 아니라 DR 측위장치 성능을 개선시키므로 터널 내 차량 및 스마트폰 네비게이션 성능 개선, 실내 운행 드론의 측위 성능 개선에 활용될 수 있음을 확인하였다.
GLONASS
Galileo (satellite navigation)
Air navigation
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The use of Global Navigation Satellite Systems (GNSS) is becoming increasingly widespread, especially in the science industry. The effect of additional GNSS systems such as the Russian GLONASS system in combination with the American Global Positioning System (GPS)is investigated in this research.
RTK surveying is an effective means of surveying for a range of applications, which delivers accurate coordinates to the user in real time. It is expected that in less than two years there will be over 70 satellites in operation from the major satellite systems, GPS, GLONASS, COMPASS and GALILIO.
The current operation of RTK GNSS relies largely on research and knowledge obtained from the use of RTK GPS over the last decade. An increase in the number of satellites available will theoretically lead to a higher accuracy and precision, and more effective and efficient surveying tool.
Testing has been undertaking to determine how a variation in the number of GLONASS satellites affect the accuracy, precision and Time to First Fix (TTFF) of a RTK GNSS receiver. The results of this testing suggest that additional satellites do lead to a shorter TTFF, which is backed up by previous research conducted in this area. It also shows that RTK GNSS is at all time high in accuracy when the initialisation integrity is maintained. The precision of RTK GNSS is also quite high when initialisation integrity is maintained, however the results show that the addition of GLONASS satellites does not improve these figures. In fact, the addtion of one or two GLONASS satellites often has an adverse effect, and results in a lesser accuracy and precision.
This research shows that RTK GNSS is an accurate and precise tool for surveying if the initialisation integrity is maintained. The addition and variation in the number of GLONASS satellites does not improve accuracy and precision, however results agree with past research thata it will lead to a more robust and reliable solution.
GLONASS
Real Time Kinematic
Galileo (satellite navigation)
Precise Point Positioning
Compass
GNSS augmentation
Dilution of precision
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The results of multi-GNSS, including Global Positioning System, GLONASS, GALILEO and BEIDOU, experimental investigation are presented in a paper. Accuracy characteristics, mean square deviations for various cases of multi-GNSS and type of approach are provided with analysis regarding possibility of global navigation satellite system use at the considered moment of time.
GLONASS
Galileo (satellite navigation)
Mode (computer interface)
GNSS augmentation
Precise Point Positioning
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Abstract We present a new approach to report, in the section 4 of International Bureau of Weights and Measures Circular T, daily values of the offset between Coordinated Universal Time (UTC) and the predictions of UTC broadcast by the Global Navigation Satellite Systems (GNSS), this quantity we name bUTC GNSS . In this approach, the determination of UTC-bUTC GNSS is based on data collected by several multi-GNSS stations in selected time laboratories worldwide. Test computations over a 7-month period from July 2022 to January 2023 show that the offset between UTC and bUTC GNSS was between 30 and 50 ns for GLONASS, between 5 and 20 ns for BeiDou, and between −5 and +5 ns for GPS and Galileo. We derive the uncertainty on the reported values, which is 4.1 ns for BeiDou and GPS, 3.7 ns for Galileo and 6.6 ns for GLONASS and show that, over the test period, the reported values of UTC-bUTC GNSS and the solutions obtained from each multi-GNSS station are all consistent within the 1-sigma uncertainties.
GLONASS
Galileo (satellite navigation)
Precise Point Positioning
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By selecting different number of IGS tracking stations,ERP parameters are estimated from GPS observations and the combined observations of GPS and GLONASS,respectively.The influences incurred by increasing the number of stations and adding GLONASS observations to the estimated ERP parameters are analyzed by comparing results to IGS published values.Thirdly,the ERP parameters are estimated with SLR data from GLONASS satellites.Finally,ERP parameters are estimated with joined results from SLR and GNSS.This research shows that not only that the systematic errors of ERP or High-frequency ERP estimated from GNSS observations are ameliorated,but also the stability of estimated ERP is improved greatly when using the joined results from SLR and GNSS.
GLONASS
Galileo (satellite navigation)
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Over the coming years GPS and GLONASS will be modernised, whilst at the same time new systems like QZSS, Galileo, and Compass are launched. The modernisations of the existing and the deployment of new Global Naviagation Satellite Systems (GNSS) will make a whole range of new signals available to the users.
Quasi-Zenith Satellite System
GLONASS
Galileo (satellite navigation)
Compass
GNSS augmentation
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