Modeling regional ionospheric delay with ground-based BeiDou and GPS observations in China

Zhang, Rui; Song, Weiwei; Yao, Yibin; Shi, Chuang; Lou, Yidong; Yi, Wu

doi:10.1007/s10291-014-0419-z

Cited by 39 publications

(18 citation statements)

References 21 publications

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“…(29.5) establish equations, since the equations of satellite and receiver DCB DCB coefficients as the satellite and the receiver can not be directly isolated DCB, the focus of benchmark constraints used for this purpose, and even if DCB of all GPS satellites and zero [3], because it is a dual system modeling, still need to make all of the Beidou satellite DCB sum to zero, this constraint does not affect the ionosphere model parameters [3]. …”

Section: ð29:5þmentioning

confidence: 99%

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Estimate DCB of BDS Satellites Based on the Observations of GPS/BDS

Wei

Zhang

Fan

et al. 2014

Lecture Notes in Electrical Engineering

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In single frequency precise point positioning, satellite's DCBs is one of the main factors impacting the positioning accuracy. In the consideration of BDS navigation system has not completed and the limited distribution of regional monitoring network, these adverse condition make it is hard to estimate the DCBs accuracy. So put forward using GPS rice data to estimate the DCB of BDS satellite by make a global ionosphere model using the observations of GPS and BDS. In this paper the strategy of estimate the DCB of BDS satellite is discussed in detail. Further analysis showed that the stability of BDS satellite's DCBs is about 0.15 ns at 1 month. In order to further validate the precision of DCB of BDS satellites from this strategy, used BDS single frequency observations to position with the correct of BDS satellite's DCB or without it. Compared with no DCBs correction, single-frequency user's positioning accuracy is improved from 47% to 63% by using DCBs correction from the algorithm.

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Section: ð29:5þmentioning

confidence: 99%

“…Currently internationally recognized GPS satellite DCB is provided by the IGS (International GNSS Service) ionospheric group, is the result of comprehensive processing by four joint ionosphere analysis center (IAAC) [2,3]. Most of them calculate satellites' DCB parameters is through make a global ionospheric model.…”

mentioning

confidence: 99%

Estimate DCB of BDS Satellites Based on the Observations of GPS/BDS

Wei

Zhang

Fan

et al. 2014

Lecture Notes in Electrical Engineering

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“…As only real-time ionosphere delays are modeled in China, a low-order spherical harmonic model is used, which is well-suited for regional areas [29]. Zhang et al chose a spherical harmonic function of degree and order 4 for modeling regional ionospheric delays with BDS and GPS observations across China [30]. In the real-time ionospheric modeling, we choose a spherical harmonic function of degree and order 5 with the BDS and GPS observations collected at all the stations shown in Figure 1.…”

Section: Ionopshere Productsmentioning

confidence: 99%

National BDS Augmentation Service System (NBASS) of China: Progress and Assessment

et al. 2017

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Abstract:In this contribution, the processing strategies of real-time BeiDou System (BDS) precise orbits, clocks, and ionospheric corrections in the National BDS Augmentation Service System (NBASS) are briefly introduced. The Root Mean Square (RMS) of BDS predicted orbits are better than 10 cm in radial and cross-track components, and the accuracy of the BDS real-time clock is better than 0.5 ns for Inclined Geosynchronous Orbit (IGSO) and Mid Earth Orbit (MEO) satellites. The accuracy of BDS Geostationary Earth Orbit (GEO) orbits and clocks are worse than the IGSO and MEO satellites due to its poor geometry conditions. The real-time ionospheric correction is evaluated by cross-validation, and the average accuracy in the vertical direction is about 4 TECU. With these real-time corrections, the overall single and dual-frequency kinematic precise point positioning (PPP) performance in China are evaluated in terms of positioning accuracy at the 95% confidence level and convergence time.The BDS PPP positioning accuracy shows significant regional characteristics due to the geometry distribution of BDS satellites and the accuracy of ionospheric model in different regions. The BDS dual-frequency PPP positioning accuracy in high-latitude and western fringe region is about 0.5 m and 1.0 m in the horizontal and vertical component, respectively, while the horizontal accuracy is better than 0.2 m and the vertical accuracy is better than 0.3 m in the midlands. The convergence time of the BDS PPP is much longer than the GPS PPP and it needs more than 60 min to achieve the accuracy better than 10 cm in both horizontal and vertical directions for dual-frequency PPP. Similar with dual-frequency PPP, the positioning accuracy of the BDS single-frequency PPP in the fringe region is worse than other regions. The positioning in the midlands can achieve 0.5 m in horizontal component and 1.0 m in the vertical component. In addition, when GPS and BDS are combined, the positioning performance of both single-frequency and dual-frequency PPP can be greatly improved.

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“…The ionospheric VTEC on local and global scales, are individually modeled by the generalized trigonometric series function over each station and the SH expansion with the order and degree of 15. In 2016, the GNSS Research Center (GRC) of Wuhan University was also recognized as a new member of the IGS IAACs [5]. The global ionosphere model using ground GNSS observations has been developed at the GRC, since 2011 [22]. An inequality-constrained least squares method was proposed, in order to eliminate the non-physical negative values in the VTEC maps [23].…”

Section: Introductionmentioning

confidence: 99%

Global Ionosphere Mapping and Differential Code Bias Estimation during Low and High Solar Activity Periods with GIMAS Software

Zhang

Zhao

2018

Remote Sensing

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Abstract:Ionosphere research using the Global Navigation Satellite Systems (GNSS) techniques is a hot topic, with their unprecedented high temporal and spatial sampling rate. We introduced a new GNSS Ionosphere Monitoring and Analysis Software (GIMAS) in order to model the global ionosphere vertical total electron content (VTEC) maps and to estimate the GPS and GLObalnaya NAvigatsionnaya Sputnikovaya Sistema (GLONASS) satellite and receiver differential code biases (DCBs). The GIMAS-based Global Ionosphere Map (GIM) products during low (day of year from 202 to 231, in 2008) and high (day of year from 050 to 079, in 2014) solar activity periods were investigated and assessed. The results showed that the biases of the GIMAS-based VTEC maps relative to the International GNSS Service (IGS) Ionosphere Associate Analysis Centers (IAACs) VTEC maps ranged from −3.0 to 1.0 TECU (TEC unit) (1 TECU = 1 × 10 16 electrons/m 2 ). The standard deviations (STDs) ranged from 0.7 to 1.9 TECU in 2008, and from 2.0 to 8.0 TECU in 2014. The STDs at a low latitude were significantly larger than those at middle and high latitudes, as a result of the ionospheric latitudinal gradients. When compared with the Jason-2 VTEC measurements, the GIMAS-based VTEC maps showed a negative systematic bias of about −1.

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Modeling regional ionospheric delay with ground-based BeiDou and GPS observations in China

Cited by 39 publications

References 21 publications

Estimate DCB of BDS Satellites Based on the Observations of GPS/BDS

Estimate DCB of BDS Satellites Based on the Observations of GPS/BDS

National BDS Augmentation Service System (NBASS) of China: Progress and Assessment

Global Ionosphere Mapping and Differential Code Bias Estimation during Low and High Solar Activity Periods with GIMAS Software

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