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Precise positioning with current multi-constellation Global Navigation Satellite Systems: GPS, GLONASS, Galileo and BeiDou.

Li X, Zhang X, Ren X, Fritsche M, Wickert J, Schuh H - Sci Rep (2015)

Bottom Line: At the moment more than 70 satellites are already in view, and about 120 satellites will be available once all four systems (BeiDou + Galileo + GLONASS + GPS) are fully deployed in the next few years.This will bring great opportunities and challenges for both scientific and engineering applications.The significant improvement of satellite visibility, spatial geometry, dilution of precision, convergence, accuracy, continuity and reliability that a combining utilization of multi-GNSS brings to precise positioning are carefully analyzed and evaluated, especially in constrained environments.

View Article: PubMed Central - PubMed

Affiliation: 1] School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, 430079, Wuhan, Hubei, China [2] German Research Centre for Geosciences (GFZ), Telegrafenberg, 14473 Potsdam, Germany.

ABSTRACT
The world of satellite navigation is undergoing dramatic changes with the rapid development of multi-constellation Global Navigation Satellite Systems (GNSSs). At the moment more than 70 satellites are already in view, and about 120 satellites will be available once all four systems (BeiDou + Galileo + GLONASS + GPS) are fully deployed in the next few years. This will bring great opportunities and challenges for both scientific and engineering applications. In this paper we develop a four-system positioning model to make full use of all available observations from different GNSSs. The significant improvement of satellite visibility, spatial geometry, dilution of precision, convergence, accuracy, continuity and reliability that a combining utilization of multi-GNSS brings to precise positioning are carefully analyzed and evaluated, especially in constrained environments.

No MeSH data available.


The SNRs and MPCs of different satellite systems and orbital types at GMSD.G02, R04, E20, C02(GEO), C06(IGSO) and C13(MEO) are selected as typical examples for their individual satellite system or orbital type. The variation of their elevations with time (GPS Time) is also shown.
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f6: The SNRs and MPCs of different satellite systems and orbital types at GMSD.G02, R04, E20, C02(GEO), C06(IGSO) and C13(MEO) are selected as typical examples for their individual satellite system or orbital type. The variation of their elevations with time (GPS Time) is also shown.

Mentions: Figure 6 shows the signal-to-noise ratio (SNR) and multipath combination (MPC12, which mainly contains code noise and multipath) values at GMSD to assess and compare the observation quality for the different satellite systems. As typical examples, the SNRs and MPCs of the satellites G02, R04 and E20 on the first frequency along with their variation of the elevations are shown in Figure 6a, b and c, respectively. The SNRs and MPCs of BeiDou GEO C02, IGSO C06 and MEO C13 are shown in Figure 6d, e and f, respectively. It can be clearly seen that both the SNR and MPC values are strongly correlated with the elevation variations. The higher the elevation angles are, the larger the SNR and the smaller the MPC values. Generally speaking, the SNR are higher than 40 and the MPC values are smaller than 0.5 m when the elevation angles are higher than 15°. We also find that the different orbital types show different variation characteristics for SNR and MPC. The IGSO satellites can be observed much longer and the corresponding SNR, MPC and elevation values change much slower than for the MEO satellites. Especially, the elevation angles of each GEO satellite stay around one specific value, the corresponding SNR and MPC values are the steadiest and nearly don't exhibit systematic variations.


Precise positioning with current multi-constellation Global Navigation Satellite Systems: GPS, GLONASS, Galileo and BeiDou.

Li X, Zhang X, Ren X, Fritsche M, Wickert J, Schuh H - Sci Rep (2015)

The SNRs and MPCs of different satellite systems and orbital types at GMSD.G02, R04, E20, C02(GEO), C06(IGSO) and C13(MEO) are selected as typical examples for their individual satellite system or orbital type. The variation of their elevations with time (GPS Time) is also shown.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4321187&req=5

f6: The SNRs and MPCs of different satellite systems and orbital types at GMSD.G02, R04, E20, C02(GEO), C06(IGSO) and C13(MEO) are selected as typical examples for their individual satellite system or orbital type. The variation of their elevations with time (GPS Time) is also shown.
Mentions: Figure 6 shows the signal-to-noise ratio (SNR) and multipath combination (MPC12, which mainly contains code noise and multipath) values at GMSD to assess and compare the observation quality for the different satellite systems. As typical examples, the SNRs and MPCs of the satellites G02, R04 and E20 on the first frequency along with their variation of the elevations are shown in Figure 6a, b and c, respectively. The SNRs and MPCs of BeiDou GEO C02, IGSO C06 and MEO C13 are shown in Figure 6d, e and f, respectively. It can be clearly seen that both the SNR and MPC values are strongly correlated with the elevation variations. The higher the elevation angles are, the larger the SNR and the smaller the MPC values. Generally speaking, the SNR are higher than 40 and the MPC values are smaller than 0.5 m when the elevation angles are higher than 15°. We also find that the different orbital types show different variation characteristics for SNR and MPC. The IGSO satellites can be observed much longer and the corresponding SNR, MPC and elevation values change much slower than for the MEO satellites. Especially, the elevation angles of each GEO satellite stay around one specific value, the corresponding SNR and MPC values are the steadiest and nearly don't exhibit systematic variations.

Bottom Line: At the moment more than 70 satellites are already in view, and about 120 satellites will be available once all four systems (BeiDou + Galileo + GLONASS + GPS) are fully deployed in the next few years.This will bring great opportunities and challenges for both scientific and engineering applications.The significant improvement of satellite visibility, spatial geometry, dilution of precision, convergence, accuracy, continuity and reliability that a combining utilization of multi-GNSS brings to precise positioning are carefully analyzed and evaluated, especially in constrained environments.

View Article: PubMed Central - PubMed

Affiliation: 1] School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, 430079, Wuhan, Hubei, China [2] German Research Centre for Geosciences (GFZ), Telegrafenberg, 14473 Potsdam, Germany.

ABSTRACT
The world of satellite navigation is undergoing dramatic changes with the rapid development of multi-constellation Global Navigation Satellite Systems (GNSSs). At the moment more than 70 satellites are already in view, and about 120 satellites will be available once all four systems (BeiDou + Galileo + GLONASS + GPS) are fully deployed in the next few years. This will bring great opportunities and challenges for both scientific and engineering applications. In this paper we develop a four-system positioning model to make full use of all available observations from different GNSSs. The significant improvement of satellite visibility, spatial geometry, dilution of precision, convergence, accuracy, continuity and reliability that a combining utilization of multi-GNSS brings to precise positioning are carefully analyzed and evaluated, especially in constrained environments.

No MeSH data available.