Augment BeiDou real-time precise point positioning using ECMWF data

Zhu, Kemin; Zhao, Lei; Wang, Wei; Zhang, Shoujian; Liu, Renli; Wang, Jinling

doi:10.1186/s40623-018-0870-0

Cited by 6 publications

(4 citation statements)

References 21 publications

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“…These models are constantly updated based on new observations or improved mathematical models, for example, on March 8, 2016, ECMWF improved the spatial resolution of its High RESolution (HRES) atmospheric analysis model to ∼9 km from ∼16 km with a 6‐h temporal resolution, and from early 2019, ECMWF started to publish the fifth generation reanalysis model (ERA5) with 1‐h temporal and ∼25 km spatial resolutions (the entire ERA5 data set from 1950 to present should gradually become available before the end of 2020), which is a replacement of the previous ERA‐Interim model (6‐h temporal and ∼75 km spatial resolutions, expired on August 31, 2019). Given these spatially regular and temporally continuous resolutions, and global availability, the weather model derived PWV has been extensively used not only in meteorology (e.g., Lin et al., 2016) but also in geodesy and geophysics, notably the mitigation of the atmospheric error in geodetic observations such as InSAR (e.g., Jolivet et al., 2014), GPS (e.g., Zhu et al., 2018), and VLBI (e.g., Boehm & Schuh, 2007). However, prior to the utilization of these state‐of‐art weather models, it is necessary and urgent to evaluate its accuracy in order to understand and quantify the uncertainty that may be introduced to the users' applications, which is therefore addressed in this study.…”

Section: Introductionmentioning

confidence: 99%

Global Comparisons of ERA5 and the Operational HRES Tropospheric Delay and Water Vapor Products With GPS and MODIS

Blewitt

2021

Earth and Space Science

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Precipitable Water Vapor (PWV) is one of the most important greenhouse gases that absorbs the most solar radiation (e.g., Kiehl & Trenberth, 1997). It plays a key role in the hydrological cycle with fundamental impacts on the Earth's climate. Good knowledge of PWV is crucial for meteorological forecasting for extreme hydro-meteorological events (e.g., Millán, 2014), fog occurrences (e.g., Veljović & Vujović, 2019), global lightning activities (e.g., Price, 2000) and tornado-produced storms (e.g., Georgiev, 2003). The spatial-temporal variability of PWV also leads to the changes in the tropospheric delay, which is known to be a common error source in geodetic observations including Global Positioning System (GPS) (e.g., Iwabuchi et al., 2003), Interferometric Synthetic Aperture Radar (InSAR) (e.g., Yip et al., 2019), Very Long Baseline Interferometry (VLBI) (e.g., Eriksson et al., 2014), and satellite altimetry (e.g., Obligis et al., 2011). Such effects prevent InSAR from measuring small magnitude or long wavelength geophysical deformation signals, for instance those resulting from inter-seismic strain accumulation and post-seismic strain relaxation which not only provide insight into the mechanics of faulting systems but also the possibility of future seismic hazards (e.g., Daout et al., 2019;Jolivet et al., 2013). As a result, mitigation of the tropospheric effect has becoming increasingly challenging in recent (e.g., Sentinel-1 and Gaofen-3) and future InSAR missions (e.g., GEOSAR and NISAR, which are due to operate in the next 3-10 years) owing to their unprecedented spatial coverage and temporal resolution of the measurement. Such effects can also degrade the GPS positioning accuracy notably in the network Real Time Kinematic mode due to their impacts on the estimation of tropospheric delay corrections used by users in order to achieve instantaneous cm-level positioning accuracy (G. R. Hu et al., 2003). This is necessitated by applications such as rapid earthquake source determination and tsunami early warning (e.g.,

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Section: Introductionmentioning

confidence: 99%

Global Comparisons of ERA5 and the Operational HRES Tropospheric Delay and Water Vapor Products With GPS and MODIS

Blewitt

2021

Earth and Space Science

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“…The nominal BDS-3 constellation consists of 24 MEO, 3 IGSO and 3 GEO satellites. BeiDou has intersatellite links and provides also a PPP service (Li et al 2014 , 2020 ; Ruan et al 2020 ; Viet et al 2020 ; Yang et al 2020 ; Zhang et al 2019 ; Zhu et al 2018 ), ( www.en.beidou.gov.cn ).…”

Section: Satellite Navigation Systemsmentioning

confidence: 99%

Status, perspectives and trends of satellite navigation

Hein

2020

Satell Navig

159

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This paper reviews the status of satellite navigation (as per 11 May 2020)—without claim for completeness—and discusses the various global navigation satellite systems, regional satellite navigation systems and satellite-based augmentation systems. Problems and challenges for delivering nowadays a safe and reliable navigation are discussed. New opportunities, perspectives and megatrends of satellite navigation are outlined. Some remarks are closing this paper emphasizing the great value of satellite navigation at present and in future.

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“…With the increasing demand for real-time high-precision PPP applications, real-time precise products for multi-GNSS were released by IGS [31]. Subsequently, researchers began to study the application of real-time PPP, such as real-time precise pointing [32,33], tropospheric delay estimation [34], time transfer [35]. Ge et al [36] introduced a receiver clock model for enhancing real-time PPP time transfer.…”

Section: Introductionmentioning

confidence: 99%

An improved method for real-time PPP timing and time transfer with broadcast ephemerides

Ge¹,

Cao²,

Zhou³

et al. 2022

Meas. Sci. Technol.

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Due to the problem of network communication, it is difficult to ensure the reliability of real-time precise point positioning (PPP) timing/time transfer with real-time precise products. With the continued reduction in the signal-in-space range error (SISRE), the performance and feasibility of GPS or Galileo PPP timing/time transfer with broadcast ephemeris were analyzed firstly in real-time. Then, we present a smoothing method and time series decomposition method to reduce the noise and the interpolation error for GPS or Galileo PPP timing\time transfer with broadcast ephemeris in real-time. The results showed that GPS or Galileo PPP timing with broadcast ephemeris can achieve 4×1E-14 level at 15360 s at the current state. The accuracy is about (0.46~0.81) ns and (0.44~0.61) ns for GPS or Galileo PPP time transfer. The frequency stability is about 7.0×1E-14 and 5.0×1E-14 levels at 15360 s for GPS and Galileo PPP. Importantly, by applying our approach, the maximum improvement in frequency stability for GPS or Galileo PPP timing/time transfer is up to 99 %. Furthermore, the average accuracy of GPS or Galileo PPP time transfer can achieve approximately 0.3 ns, which is improved by up to 67.3 % as compared to the traditional method.

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Augment BeiDou real-time precise point positioning using ECMWF data

Cited by 6 publications

References 21 publications

Global Comparisons of ERA5 and the Operational HRES Tropospheric Delay and Water Vapor Products With GPS and MODIS

Global Comparisons of ERA5 and the Operational HRES Tropospheric Delay and Water Vapor Products With GPS and MODIS

Status, perspectives and trends of satellite navigation

An improved method for real-time PPP timing and time transfer with broadcast ephemerides

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