Statistical analysis and quality control for GPS fractional cycle bias and integer recovery clock estimation with raw and combined observation models

Cheng, Shuyang; Wang, Jinling; Peng, Wenjie

doi:10.1016/j.asr.2017.06.053

Cited by 24 publications

(9 citation statements)

References 19 publications

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“…In fact, the equivalent EWL/WL ambiguities can be obtained by means of parameter estimation and HMW linear combination. The equivalency for WL UPD from these two methods has been demonstrated in Cheng et al (2017). Therefore, the EWL/WL UPD is determined by code and phase observations itself and is not related to the precise clock and orbit products.…”

Section: Upd Estimation and Ppp Armentioning

confidence: 98%

GPS + Galileo + BeiDou precise point positioning with triple-frequency ambiguity resolution

et al. 2020

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Along with the rapid development of GNSS, not only BeiDou, but also Galileo, and the newly launched GPS satellites can provide signals on three frequencies at present. To fully take advantage of the multi-frequency multi-system GNSS observations on precise point positioning (PPP) technology, this study aims to implement the triple-frequency ambiguity resolution (AR) for GPS, Galileo, and BeiDou-2 combined PPP using the raw observation model. The processing of inter-frequency clock bias (IFCB) estimation and correction in the context of triple-frequency PPP AR has been addressed, with which the triple-frequency uncalibrated phase delay (UPD) estimation is realized for real GPS observations for the first time. In addition, the GPS extra-wide-line UPD quality is significantly improved with the IFCB correction. Because of not being contaminated by the IFCB, the raw UPD estimation method is directly employed for Galileo which currently has 24 satellites in operation. An interesting phenomenon is found that all Galileo satellites except E24 have a zero extra-wide-lane UPD value. With the multi-GNSS observations provided by MGEX covering 15 days, the positioning solutions of GPS + Galileo + BeiDou triple-frequency PPP AR have been conducted and analyzed. The triple-frequency kinematic GNSS PPP AR can achieve an averaged 3D positioning error of 2.2 cm, and an averaged convergence time of 10.8 min. The average convergence time can be reduced by triple-frequency GNSS PPP AR by 15.6% compared with dual-frequency GNSS PPP AR, respectively. However, the additional third frequency has only a marginal contribution to positioning accuracy after convergence.

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Section: Upd Estimation and Ppp Armentioning

confidence: 98%

GPS + Galileo + BeiDou precise point positioning with triple-frequency ambiguity resolution

et al. 2020

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“…biases in the estimated UPDs/FCBs, IRCs or DSCs, will be absorbed into the estimated ambiguity terms, causing incorrect fixed-PPP solutions, or even failure in ambiguity fixing (Geng et al 2012). Cheng, et al (2017) proposed a quality control and reliability analysis procedure for their own FCB and IRC estimation to achieve reliable PPP-AR. Their detector for FCB was able to detect small phase outliers (larger than 0.4 cycles) and the undetectable outliers had insignificant impact on estimated FCBs.…”

Section: Products (Corrections)mentioning

confidence: 99%

“…There is little literature that discusses the quality control procedures which can be used to check the integrity of PPP corrections, e.g. FCB/IRC estimation (Cheng et al 2017), orbit and clock corrections (El-Mowafy 2018), and the combined corrections of satellite clocks, ionospheric parameters and ambiguity solutions (Khodabandeh et al 2019). These quality control procedures can perform FDE and the analysis of different faults, as well as their impacts on the PPP solutions.…”

Section: Integrity Monitoring For Pppmentioning

confidence: 99%

Vulnerabilities and integrity of precise point positioning for intelligent transport systems: overview and analysis

Wang

Rizos

et al. 2021

Satell Navig

Self Cite

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The implementation of Intelligent Transport System (ITS) technology is expected to significantly improve road safety and traffic efficiency. One of the key components of ITS is precise vehicle positioning. Positioning with decimetre to sub-metre accuracy is a fundamental capability for self-driving, and other automated applications. Global Navigation Satellite System (GNSS) Precise Point Positioning (PPP) is an attractive positioning approach for ITS due to its relatively low-cost and flexibility. However, GNSS PPP is vulnerable to several effects, especially those caused by the challenging urban environments, where the ITS technology is most likely needed. To meet the high integrity requirements of ITS applications, it is necessary to carefully analyse potential faults and failures of PPP and to study relevant integrity monitoring methods. In this paper an overview of vulnerabilities of GNSS PPP is presented to identify the faults that need to be monitored when developing PPP integrity monitoring methods. These vulnerabilities are categorised into different groups according to their impact and error sources to assist integrity fault analysis, which is demonstrated with Failure Modes and Effects Analysis (FMEA) and Fault Tree Analysis (FTA) methods. The main vulnerabilities are discussed in detail, along with their causes, characteristics, impact on users, and related mitigation methods. In addition, research on integrity monitoring methods used for accounting for the threats and faults in PPP for ITS applications is briefly reviewed. Both system-level (network-end) and user-level (user-end) integrity monitoring approaches for PPP are briefly discussed, focusing on their development and the challenges in urban scenarios. Some open issues, on which further efforts should focus, are also identified.

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“…gov/orms/goa) and Coulomb US Geological Survey. For this study, we used GIPSY OASIS II developed by the Jet Propulsion Laboratory (JPL) as single-receiver ambiguity resolution in kinematic positioning (function of time) or PPP (Webb and Zumberge 1996;Yi et al 2011Yi et al , 2012Yi et al , 2013cCheng et al 2017), RINEX 2.11 input file format, measurement types: dual frequency P code and phase; JPL's precise orbit and clock products in the ITRF08 reference system, cutoff 5 , average PDOP less than 2, IGS standards satellite antenna phase centre offset, antenna type in RINEX input file, tropospheric gradients (Bar-Sever et al 1998), second-order ionospheric delay (Kedar et al 2003).…”

Section: Gps Measurement Processingmentioning

confidence: 99%

Peak horizontal vibrations from GPS response spectra in the epicentral areas of the 2016 earthquake in central Italy

Gatti

2018

Geomatics, Natural Hazards and Risk

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GPS measurements recorded at active sites in central Italy during the seismic events of greatest magnitude (24 August, 26 and 30 October 2016) were processed in kinematic mode according to the Precise Point Positioning (PPP) technique. The resulting data were the displacements and, by derivation with respect to time, the velocities and instantaneous horizontal accelerations. Elastic response spectra along the orthogonal walls of the site (if the GPS antenna was fixed to a building) or along the geographical directions (if the antenna was fixed to the ground) were obtained from the derived accelerations. The maximum amplitudes, i.e. "peak vibrations", were then extracted from the response spectra. These peaks, unlike the co-seismic movements, represent the maximum instantaneous vibrations recorded following the "shock" produced by the seismic waves and thus are representative of both the discomfort perceived by the populations and the structural damage. This study shows that GPS is becoming an increasingly important tool to measure and monitor the dynamic responses of a structure. The results also provide a complete picture of the displacements induced by the seismic sequences in the earthquake-affected areas, leaving unresolved some questions concerning the localization of the phenomena and the causes of the structural deformations.

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Statistical analysis and quality control for GPS fractional cycle bias and integer recovery clock estimation with raw and combined observation models

Cited by 24 publications

References 19 publications

GPS + Galileo + BeiDou precise point positioning with triple-frequency ambiguity resolution

GPS + Galileo + BeiDou precise point positioning with triple-frequency ambiguity resolution

Vulnerabilities and integrity of precise point positioning for intelligent transport systems: overview and analysis

Peak horizontal vibrations from GPS response spectra in the epicentral areas of the 2016 earthquake in central Italy

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