Journal ArticleDOI
Homogeneous reprocessing of GPS, GLONASS and SLR observations
Mathias Fritsche,Krzysztof Sośnica,C. Rodriguez-Solano,Peter Steigenberger,Kan Wang,Reinhard Dietrich,Rolf Dach,Urs Hugentobler,Markus Rothacher +8 more
TLDR
In this paper, a combined reprocessing of GPS and GLONASS observations was performed to estimate combined GPS+GLONASS satellite clocks, with first results presented in this paper.Abstract:
The International GNSS Service (IGS) provides operational products for the GPS and GLONASS constellation. Homogeneously processed time series of parameters from the IGS are only available for GPS. Reprocessed GLONASS series are provided only by individual Analysis Centers (i. e. CODE and ESA), making it difficult to fully include the GLONASS system into a rigorous GNSS analysis. In view of the increasing number of active GLONASS satellites and a steadily growing number of GPS+GLONASS-tracking stations available over the past few years, Technische Universitat Dresden, Technische Universitat Munchen, Universitat Bern and Eidgenossische Technische Hochschule Zurich performed a combined reprocessing of GPS and GLONASS observations. Also, SLR observations to GPS and GLONASS are included in this reprocessing effort. Here, we show only SLR results from a GNSS orbit validation. In total, 18 years of data (1994–2011) have been processed from altogether 340 GNSS and 70 SLR stations. The use of GLONASS observations in addition to GPS has no impact on the estimated linear terrestrial reference frame parameters. However, daily station positions show an RMS reduction of 0.3 mm on average for the height component when additional GLONASS observations can be used for the time series determination. Analyzing satellite orbit overlaps, the rigorous combination of GPS and GLONASS neither improves nor degrades the GPS orbit precision. For GLONASS, however, the quality of the microwave-derived GLONASS orbits improves due to the combination. These findings are confirmed using independent SLR observations for a GNSS orbit validation. In comparison to previous studies, mean SLR biases for satellites GPS-35 and GPS-36 could be reduced in magnitude from $$-35$$
and $$-38$$
mm to $$-12$$
and $$-13$$
mm, respectively. Our results show that remaining SLR biases depend on the satellite type and the use of coated or uncoated retro-reflectors. For Earth rotation parameters, the increasing number of GLONASS satellites and tracking stations over the past few years leads to differences between GPS-only and GPS+GLONASS combined solutions which are most pronounced in the pole rate estimates with maximum 0.2 mas/day in magnitude. At the same time, the difference between GLONASS-only and combined solutions decreases. Derived GNSS orbits are used to estimate combined GPS+GLONASS satellite clocks, with first results presented in this paper. Phase observation residuals from a precise point positioning are at the level of 2 mm and particularly reveal poorly modeled yaw maneuver periods.read more
Citations
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Journal ArticleDOI
Review of Recent GNSS Modelling Improvements Based on CODEs Repro3 Contribution
Rolf Dach,Inga Selmke,Arturo Villiger,Daniel Arnold,Lars Prange,Stefan Schaer,Dmitry Sidorov,Pascal Stebler,Adrian Jäggi,Urs Hugentobler +9 more
TL;DR: A feature applied for the first time in this reprocessing series is to downweight the observations of a number of GPS satellites with a reduced stability in the attitude control around the year 2000 to reduce the noise level of GNSS-derived products.
Book ChapterDOI
Satellite Orbits and Attitude
TL;DR: In this article, the authors discuss the fundamentals of orbital dynamics and provide a description of key perturbations affecting global navigation satellite system (GNSS ) satellites along with their impact on the orbits.
Journal ArticleDOI
A Study of Rank Defect and Network Effect in Processing the CMONOC Network on Bernese
Weiwei Wu,Jicang Wu,Guojie Meng +2 more
TL;DR: The nonsingularity of the original NEQ is confirmed, the efficiency of the controlled datum removal (CDR) method in filtering out the three frame-origin-related datum contents is reviewed, and the superiority of a globally distributed fiducial network for frame alignment of the reconstructed NEQs via No-Net-Translation (NNT) MC conditions is revealed.
Book ChapterDOI
Validation of Components of Local Ties
Susanne Glaser,Susanne Glaser,Mathias Fritsche,Krzysztof Sośnica,Krzysztof Sośnica,C. Rodriguez-Solano,Kan Wang,Rolf Dach,Urs Hugentobler,Markus Rothacher,Reinhard Dietrich +10 more
TL;DR: This study combines Global Navigation Satellite Systems (GNSS) and Satellite Laser Ranging (SLR) data without using LTs but by combining the common pole coordinates and by adding proper datum constraints, which allows an independent validation of measured LT components.
Journal ArticleDOI
Impacts on Noise Analyses of GNSS Position Time Series Caused by Seasonal Signal, Weight Matrix, Offset, and Helmert Transformation Parameters
TL;DR: The authors assess the effects of seasonal signals, weight matrix, intermittent offsets, and Helmert transformation parameters on the noise analyses of the GNSS position time series to find out how these factors affect the estimates of parameters in the deterministic model.
References
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Precise point positioning for the efficient and robust analysis of GPS data from large networks
TL;DR: This work determines precise GPS satellite positions and clock corrections from a globally distributed network of GPS receivers, and analysis of data from hundreds to thousands of sites every day with 40-Mflop computers yields results comparable in quality to the simultaneous analysis of all data.
Journal ArticleDOI
The development and evaluation of the Earth Gravitational Model 2008 (EGM2008)
TL;DR: EGM2008 as mentioned in this paper is a spherical harmonic model of the Earth's gravitational potential, developed by a least squares combination of the ITG-GRACE03S gravitational model and its associated error covariance matrix, with the gravitational information obtained from a global set of area-mean free-air gravity anomalies defined on a 5 arc-minute equiangular grid.
Journal ArticleDOI
The International GNSS Service in a changing landscape of Global Navigation Satellite Systems
John Dow,Ruth Neilan,Chris Rizos +2 more
TL;DR: The IGS Strategic Plan and future directions of the globally-coordinated ~400 station IGS network, tracking data and information products, and outlines the scope of a few of its numerous working groups and pilot projects as the world anticipates a truly multi-system GNSS in the coming decade are discussed.
Book
Bernese GPS Software Version 5.0
Gerhard Beutler,Heike Bock,Rolf Dach,Pierre Fridez,Andreas Gäde,Urs Hugentobler,Adrian Jäggi,Michael Meindl,Leos Mervart,Lars Prange,Stefan Schär,Tim Springer,C. Urschl,Peter Walser +13 more
Journal ArticleDOI
ITRF2008: an improved solution of the international terrestrial reference frame
TL;DR: ITRF2008 as mentioned in this paper is a refined version of the International Terrestrial Reference Frame based on reprocessed solutions of the four space geodetic techniques: VLBI, SLR, GPS and DORIS, spanning 29, 26, 12.5 and 16 years of observations, respectively.
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The International GNSS Service in a changing landscape of Global Navigation Satellite Systems
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