scholarly journals ON THE EVALUATION OF GNSS COMPLEMENTARY BY USING QUASIZENITH SATELLITE OF JAPAN

2016 ◽  
Vol XLI-B1 ◽  
pp. 495-502
Author(s):  
N. Sekiguchi ◽  
M. Shikada ◽  
T. Kanai
Keyword(s):  
Urban Area ◽  
Tall Buildings ◽  
Positional Information ◽  
Satellite System ◽  
Japanese Government ◽  
Positioning Accuracy ◽  
Satellite Positioning

The positional information has an important role in our lifestyle. People need to get positional information by GNSS. The satellite positioning must receive a signal from four or more satellites, however, most of Japanese country is covered with mountain and urban area has a lot of tall buildings. Then Japanese government launched QZS (Quasi Zenith Satellite) which is the first satellite of QZSS (Quasi Zenith Satellite System) in 2010. QZSS including QZS can improve positioning accuracy and reliability. QZS has 6 signals by using four kinds of frequency. These signals are the same frequency of GPS and GLONASS and so on. This paper was reported about the comparison of the positioning between GPS and QZSS.

scholarly journals ACCURACY ANALYSIS OF THE SATELLITE POSITIONING BY USING GNSS REFERENCE STATIONS

2020 ◽  
pp. 350-354
Author(s):  
A.U. Chymyrov ◽  
Sh.S. Sargazakova ◽  
N.Y. Ismailov
Keyword(s):  
Accuracy Analysis ◽  
Satellite Measurements ◽  
Positioning Accuracy ◽  
Satellite Positioning ◽  
Control Centre ◽  
Gnss Receivers

The technology of satellite positioning by using RTK service by the KyrPOS -Control Centre of CORS Network is studied in this article. Differentially corrected satellite measurements with geodetic class GNSS receivers were done and their positioning accuracy was analyzed.

Horizontal GPS Positioning Accuracy During the 1999 Solar Eclipse

2001 ◽  
Vol 54 (2) ◽  
pp. 293-296 ◽  
Author(s):  
Renato Filjar
Keyword(s):  
Statistical Analysis ◽  
Solar Eclipse ◽  
Space Weather ◽  
Significant Activity ◽  
Positioning Accuracy ◽  
Positioning Systems ◽  
Gps Positioning ◽  
Positioning Errors ◽  
Satellite Positioning ◽  
The Impact

Although GPS positioning errors are now well described, there are still some uncertainties regarding the impact of some rare space weather phenomena on GPS positioning accuracy. Solar eclipses have been considered as one source of such rare events, so the 1999 solar eclipse gave the opportunity to collect horizontal GPS positioning data for further analysis. The results of statistical analysis show no deterioration of horizontal GPS positioning accuracy. Space weather, ionospheric and geomagnetic conditions were also carefully analysed and showed no significant activity. In conclusion, the experiment confirmed negligible impact of the 1999 solar eclipse on horizontal GPS positioning accuracy, and opens discussion concerning application of satellite positioning systems in space and ionospheric weather monitoring.

scholarly journals ON THE EVALUATION OF GNSS COMPLEMENTARY BY USING QUASIZENITH SATELLITE OF JAPAN

2016 ◽  
Vol XLI-B1 ◽  
pp. 495-502
Author(s):  
N. Sekiguchi ◽  
M. Shikada ◽  
T. Kanai
Keyword(s):  
Urban Area ◽  
Tall Buildings ◽  
Positional Information ◽  
Satellite System ◽  
Japanese Government ◽  
Positioning Accuracy ◽  
Satellite Positioning

The positional information has an important role in our lifestyle. People need to get positional information by GNSS. The satellite positioning must receive a signal from four or more satellites, however, most of Japanese country is covered with mountain and urban area has a lot of tall buildings. Then Japanese government launched QZS (Quasi Zenith Satellite) which is the first satellite of QZSS (Quasi Zenith Satellite System) in 2010. QZSS including QZS can improve positioning accuracy and reliability. QZS has 6 signals by using four kinds of frequency. These signals are the same frequency of GPS and GLONASS and so on. This paper was reported about the comparison of the positioning between GPS and QZSS.

The Beidou Satellite Positioning System and Its Positioning Accuracy

Navigation ◽  
2005 ◽  
Vol 52 (3) ◽  
pp. 123-129 ◽  
Author(s):  
SHAOFENG BIAN ◽  
JIHANG JIN ◽  
ZHAOBAO FANG
Keyword(s):  
Positioning System ◽  
Positioning Accuracy ◽  
Satellite Positioning

Improvement of GPS and GLONASS Positioning Accuracy by Multipath Mitigation Using Omnidirectional Infrared Camera

2011 ◽  
Vol 23 (6) ◽  
pp. 1125-1131 ◽  
Author(s):  
Mitsunori Kitamura ◽  
◽  
Taro Suzuki ◽  
Yoshiharu Amano ◽  
Takumi Hashizume
Keyword(s):  
Mobile Robots ◽  
Infrared Camera ◽  
Multipath Mitigation ◽  
Positioning Accuracy ◽  
Ir Camera ◽  
Multipath Error ◽  
Satellite Positioning ◽  
Positioning Technique ◽  
The Difference ◽  
Atmospheric Transmittance

This paper describes a precision positioning technique that can be applied to vehicles or mobile robots in urban or leafy environments. The availability of satellite positioning is currently expected to improve due to the presence of positioning satellites such as US GPS, Russia’s Glonass and Europe’s Galileo. Due to the serious multipath impact on positioning accuracy in urban or leafy areas, however, improvements in satellite positioning availability do not necessarily facilitate highprecision positioning. Our proposed technique mitigates the GPS and Glonass multipath using an omnidirectional infrared (IR) camera that can eliminate the need for invisible satellites using IR images. With an IR camera, the sky appears distinctively dark. This facilitates the detection of the borderline between the sky and surrounding buildings and foliage due to the difference in atmospheric transmittance between visible light and IR rays, since buildings and foliage appear white. The proposed technique can automatically and robustly mitigate the GPS and Glonass multipath by excluding invisible satellites. Positioning was evaluated with visible satellites, which have less multipath error and without using invisible satellites. Evaluation results confirmed the effectiveness of the proposed technique and the feasibility of its highly accurate positioning.

scholarly journals Sphere to Spheroid Comparisons

2006 ◽  
Vol 59 (3) ◽  
pp. 491-496 ◽  
Author(s):  
Michael A. Earle
Keyword(s):  
Great Circle ◽  
Positioning Accuracy ◽  
The Earth ◽  
Satellite Positioning ◽  
The Difference ◽  
Great Circle Distance ◽  
Spheroidal Model

The notion of the earth as a perfect sphere has served navigators quite well over the centuries and it continues to provide a basis for instruction and practical navigation. Aside from the fact that modern navigators employ refined models of the earth such as the WGS84 ellipsoid, which together with satellite positioning gives unprecedented positioning accuracy, the question arises as to just how good are the spherical results for distance when compared to the results for distance obtained from the spheroidal model. In this document a comparison is made of great circle distance (GCD) on the sphere with great ellipse distance (GED) on the spheroid. This comparison is then repeated for rhumbline distances. In each case it is concluded that the difference in using the sphere when compared to the spheroid is near 0·5%.

scholarly journals MEC-Driven Fast Deformation Monitoring Based on GNSS Signal

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Bo Li ◽  
Shangwei Chen ◽  
Yi Liu ◽  
Kan Xie ◽  
Shengli Xie
Keyword(s):  
Network Architecture ◽  
State Transition ◽  
Satellite Observation ◽  
Observation Time ◽  
Deformation Monitoring ◽  
Edge Computing ◽  
Railway Track ◽  
Positioning Accuracy ◽  
Satellite Positioning ◽  
Monitoring Process

In the deformation monitoring based on satellite positioning, the extraction of the effective deformation signal which needs plenty of computing resources is very important. Mobile-edge computing can provide low latency and near-edge computing agility for the deformation monitoring process. In this paper, we propose an edge computing network architecture to reduce the satellite observation time while maintaining a certain positioning accuracy. In such architecture, the state transition equation is established for monitoring, and the Kalman filter is used to reduce the error caused by the reduction of the observation time. At the same time, the method of determining the initial filter value and the filtering process are given. Through the actual monitoring of a certain section of railway track, the feasibility of the proposed method is proved.

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