Near-field surface displacement and permanent deformation induced by the Alaska Mw 7.5 earthquake determined by high-rate real-time ambiguity-fixed PPP solutions

Chen, Gang; Zhao, Qile

doi:10.1007/s11434-014-0609-7

Cited by 9 publications

(8 citation statements)

References 22 publications

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“…Two types of orbit and clock products are used in the experiment. One type is the determined orbit and clock products provided by ESA to the IGS, while the other is the real-time orbit and clock estimated as described in [ 15 ]. The interval of satellite orbit is 15 min, and the sample rate of satellite clock is 30 s for both types of products.…”

Section: Experiments and Results Analysismentioning

confidence: 99%

“…The interval of satellite orbit is 15 min, and the sample rate of satellite clock is 30 s for both types of products. The determined products are obtained by the post-processing mode, and their accuracy is better than that of real-time ones [ 15 ]. The standard GB PPP solutions, in parallel with the GF process, are computed using raw L1 and L2 observations.…”

Section: Experiments and Results Analysismentioning

confidence: 99%

“…This technique has been intensively developed from static to kinematic positioning [ 3 ], from post-processing to real-time service [ 4 , 5 ], from using global positioning system (GPS) only to using multi-constellation systems [ 6 ], from ambiguity-float to integer ambiguity-fixed solution [ 7 , 8 , 9 , 10 ], from decimeter to centimeter accuracy [ 11 ]. The PPP technique started with the ionosphere-free combination approach [ 1 ] and then developed with the raw observation approach [ 11 , 12 , 13 , 14 , 15 ]. One of the major differences of these two approaches is that one eliminates the ionosphere delay while the other estimates it.…”

Section: Introductionmentioning

confidence: 99%

“…The raw observation approach uses only one process that produces L1 and L2 ambiguities simultaneously [ 14 ], which are then used to form GB WL ambiguities and further produce WL satellite phase biases. A variant of the raw observation approach is to produce WL and L2 ambiguities simultaneously in the GB model [ 15 ]. WL ambiguities are the basis of going forwards for these two approaches.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Wide-Lane Ambiguities Derived from Geometry-Free and Geometry-Based Precise Point Positioning Models and Their Implication for Orbit and Clock Quality

Chen

Liu

Zhao

2018

Sensors

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Orbit and clock products are used in real-time global navigation satellite systems (GNSS) precise point positioning (PPP) without knowing their quality. This study develops a new approach to detect orbit and clock errors through comparing geometry-free and geometry-based wide-lane ambiguities in a PPP model. The reparameterization and estimation procedures of the geometry-free and geometry-based ambiguities are described in detail. The effects of orbit and clock errors on ambiguities are given in analytical expressions. The numerical similarity and differences of geometry-free and geometry-based wide-lane ambiguities are analyzed using different orbit and clock products. Furthermore, two types of typical errors in orbit and clock are simulated and their effects on wide-lane ambiguities are numerically produced and analyzed. The contribution discloses that the geometry-free and geometry-based wide-lane ambiguities are equivalent in terms of their formal errors. Although they are very close in terms of their estimates when the used orbit and clock for geometry-based ambiguities are precise enough, they are not the same, in particular, in the case that the used orbit and clock, as a combination, contain significant errors. It is discovered that the discrepancies of geometry-free and geometry-based wide-lane ambiguities coincide with the actual time-variant errors in the used orbit and clock at the line-of-sight direction. This provides a quality index for real-time users to detect the errors in real-time orbit and clock products, which potentially improves the accuracy of positioning.

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Section: Experiments and Results Analysismentioning

confidence: 99%

Section: Experiments and Results Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of Wide-Lane Ambiguities Derived from Geometry-Free and Geometry-Based Precise Point Positioning Models and Their Implication for Orbit and Clock Quality

Chen

Liu

Zhao

2018

Sensors

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“…Since June 1998, the International GNSS Service (IGS) ionosphere working group has started to routinely deliver the global ionosphere maps (GIMs) in support of a wide range of atmospheric and geodetic applications [5][6][7]. Instead of relying almost exclusively on the US Global Positioning System (GPS), as was often the case throughout the past several decades [8][9][10][11], the emergence of new GNSS constellations in recent years would bring unprecedented opportunities for more detailed ionospheric investigations [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Characterization of multi-GNSS between-receiver differential code biases using zero and short baselines

Zhang

Teunissen

2015

Science Bulletin

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Care should be taken to minimize adverse impact of receiver differential code biases (DCBs) on global navigation satellite system (GNSS)-derived ionospheric parameters. It is therefore of importance to ascertain the intrinsic characteristics of receiver DCBs, preferably in the context of new-generation GNSS. In this contribution, we present a method that enables time-wise retrieval of between-receiver DCBs (BR-DCBs) from dualfrequency, code-only measurements collected by a pair of co-located receivers. This method is applicable to the US GPS as well as to a new set of GNSS constellations including the Chinese BeiDou, the European Galileo and the Japanese QZSS. With the use of this method, we determine the multi-GNSS BR-DCB time-wise estimates covering a time period of up to 2 years (January 2013-March 2015) with a 30-s time resolution for five receiverpairs (four zero and one short baselines). For the BR-DCB time-wise estimates pertaining to an arbitrary receiver-pair and constellation, we demonstrate their promising intraday stability by means of statistical hypothesis testing. We also find that the BeiDou BR-DCB daily weighted average (DWA) estimates show a dependence on satellite type, in particular for receiver-pairs of mixed types. Finally, we demonstrate that long-term variability in BR-DCB DWA estimates can be closely associated with hardware temperature variations inside the receivers.

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Real‐time capture of seismic waves using high‐rate multi‐GNSS observations: Application to the 2015 M_w 7.8 Nepal earthquake

Geng

Xie

Fang

et al. 2016

Geophysical Research Letters

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The variometric approach is investigated to measure real‐time seismic waves induced by the 2015 Mw 7.8 Nepal earthquake with high‐rate multi‐GNSS observations, especially with the contribution of newly available BDS. The velocity estimation using GPS + BDS shows an additional improvement of around 20% with respect to GPS‐only solutions. We also reconstruct displacements by integrating GNSS‐derived velocities after a linear trend removal (IGV). The displacement waveforms with accuracy of better than 5 cm are derived when postprocessed GPS precise point positioning results are used as ground truth, even if those stations have strong ground motions and static offsets of up to 1–2 m. GNSS‐derived velocity and displacement waveforms with the variometric approach are in good agreement with results from strong motion data. We therefore conclude that it is feasible to capture real‐time seismic waves with multi‐GNSS observations using the IGV‐enhanced variometric approach, which has critical implications for earthquake early warning, tsunami forecasting, and rapid hazard assessment.

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Near-field surface displacement and permanent deformation induced by the Alaska Mw 7.5 earthquake determined by high-rate real-time ambiguity-fixed PPP solutions

Cited by 9 publications

References 22 publications

Analysis of Wide-Lane Ambiguities Derived from Geometry-Free and Geometry-Based Precise Point Positioning Models and Their Implication for Orbit and Clock Quality

Analysis of Wide-Lane Ambiguities Derived from Geometry-Free and Geometry-Based Precise Point Positioning Models and Their Implication for Orbit and Clock Quality

Characterization of multi-GNSS between-receiver differential code biases using zero and short baselines

Real‐time capture of seismic waves using high‐rate multi‐GNSS observations: Application to the 2015 M_w 7.8 Nepal earthquake

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Near-field surface displacement and permanent deformation induced by the Alaska Mw 7.5 earthquake determined by high-rate real-time ambiguity-fixed PPP solutions

Cited by 9 publications

References 22 publications

Analysis of Wide-Lane Ambiguities Derived from Geometry-Free and Geometry-Based Precise Point Positioning Models and Their Implication for Orbit and Clock Quality

Analysis of Wide-Lane Ambiguities Derived from Geometry-Free and Geometry-Based Precise Point Positioning Models and Their Implication for Orbit and Clock Quality

Characterization of multi-GNSS between-receiver differential code biases using zero and short baselines

Real‐time capture of seismic waves using high‐rate multi‐GNSS observations: Application to the 2015 Mw 7.8 Nepal earthquake

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Product

Resources

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Real‐time capture of seismic waves using high‐rate multi‐GNSS observations: Application to the 2015 M_w 7.8 Nepal earthquake