Improving Precise Point Positioning Convergence Time through TEQC Multipath Linear Combination

Galala, Mohammed Abou; Kaloop, Mosbeh R.; Rabah, Mostafa; Zeidan, Zaki M.

doi:10.1061/(asce)su.1943-5428.0000250

Cited by 10 publications

(6 citation statements)

References 23 publications

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“…The integrity of data reflects the performance of the space-borne GPS receiver and the observation environment [23]. In order to assess the quality of COSMIC-2 space-borne GPS data, the above indexes are studied in detail by the public software TEQC [24]. There are a large number of missing data for the two days of DOY140 and DOY141 for Sat-1, so the quality assessment of the data of Sat-1 on these two days will not be carried out.…”

Section: Gps Satellite Visibilitymentioning

confidence: 99%

Analysis of Space-Borne GPS Data Quality and Evaluation of Precise Orbit Determination for COSMIC-2 Mission Based on Reduced Dynamic Method

Kong¹,

Chen²,

Fang³

et al. 2022

Remote Sensing

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COSMIC-2 is a remote sensing satellite mission that mainly provides scientific data for weather forecasting, ionosphere, and climate research. High precise orbit is the basis for the application of remote sensing satellite data. In order to realize the precise orbit determination (POD) of COSMIC-2, we have assessed the quality of space-borne GPS observation in detail, including the utilization of GPS observations, cycle slip ratio (o/slps), multipath error, single-noise ratio (SNR) and ionospheric delay rate (IOD) of the data, realized the POD of COSMIC-2 with the reduced dynamic (RD) method, and evaluated the accuracy of the solved orbit by means of the carrier-phase residual, overlapping orbit comparison and the reference orbit comparison. The data quality assessments show that the data is less affected by the multipath effect, the utilization of the data is low, cycle slips occur frequently, and the carrier-phase data is often interrupted. The POD results indicate that the root mean square (RMS) values of the carrier-phase residuals of six COSMIC-2 satellites are between 6.0 mm and 7.5 mm, The mean RMS values of the overlapping orbit are better than 0.92 cm, 1.33 cm and 1.03 cm in the radial (R), tangential (T) and normal (N) directions respectively, and the mean RMS values of the six satellites in the 3D direction are between 1.38 cm and 1.75 cm. The mean RMS values in R, T and N directions orbit determination accuracy of the reference orbit comparison are better than 5.61 cm, 6.59 cm and 2.29 cm respectively, and the mean RMS values of the six satellites in the 3D direction are between 7.35 cm and 8.79 cm.

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Section: Gps Satellite Visibilitymentioning

confidence: 99%

Analysis of Space-Borne GPS Data Quality and Evaluation of Precise Orbit Determination for COSMIC-2 Mission Based on Reduced Dynamic Method

Kong¹,

Chen²,

Fang³

et al. 2022

Remote Sensing

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“…The evaluation of the convergence time of the solutions is a very significant aspect, especially for the practical point of view, because it is the time that a surveyor has to wait before starting to work, and it could depend on several elements, such as the satellites view and the multipath effect (Seepersad and Bisnath 2015;Abou Galala et al 2018). When the receiver is turned on, the system needs some time to provide the declared precision.…”

Section: Convergence Timementioning

confidence: 99%

Performance of Atlas GNSS Global Correction Service for High-Accuracy Positioning

2021

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In the last decade, a number of correction services for global navigation satellite systems (GNSS) precise positioning have been developed, mainly for offshore applications, based on a precise point positioning (PPP) real-time processing. These allow receiving corrections without the need for an internet connection or reference benchmarks around the survey area. In the paper, we tested the Atlas correction service implemented in a Stonex S900A machine (Monza, Italy), with the purpose to verify its performances under optimal operational conditions and in the practical case of a land survey on several benchmarks along the Adriatic coast. The data analysis focused on: accuracy with respect to the reference frame, repeatability of the coordinates considering short and long acquisition periods, time to initialize the survey, and reliability of the formal errors provided by the instrument. The system confirmed the declared performances in most cases and is shown to be a viable alternative to other GNSS techniques also for land surveys where no obstacles affect the sky visibility.

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“…In the case of short base lines, the residual orbital errors ( , residual ionospheric errors ( ), and residual tropospheric errors ( ) can be considered negligible (Hofmann, 2008). Multipath errors are not mitigated by differencing observations, and hence a user should try to avoid multipath environments whenever possible as the best approach to mitigating their effects (Abu Galala et al, 2018).…”

Section: Nimentioning

confidence: 99%

Evaluation of the IGS–Global Ionospheric Mapping model over Egypt

Rabah

Sedeek

2018

Preprint

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Abstract. Global ionosphere maps (GIM) are generated on a daily basis at CODE using data from about 400 GPS/GLONASS sites of the IGS and other institutions. The vertical total electron content (VTEC) is modeled in a solar-geomagnetic reference frame using a Spherical Harmonics Expansion “SHE” up to degree and order 15. To cover the holes of the first GIM computation stage existing in the North Africa and over the Oceans resulting a shortage of GNSS station in North Africa, an optimum spatial-temporal interpolation technique was developed to cover these holes (Krankowski and Hernandez-Pajares, 2016). The current paper evaluates the ionospheric correction by Global Ionospheric Maps, GIM, provided in (IONEX) files produced by International GNSS Services “IGS”. The evaluation is performed based on investigating the effect of a given GIM ionospheric correction on kinematic relative positioning solutions. The evaluation was done using several baselines of different lengths in Egypt. The results show that there is no significant effect of the provided GIM values on the solution of kinematic processing. The results confirm that although there is a lack of International GNSS Service (IGS stations) over North Africa, GIMs have no effect in mitigating ionospheric error. A new value for the ionosphere correction VTEC values was obtained by a regional, developed algorithm based on zero-differenced phase ionospheric delay (ZDPID) (Tawfeek et al., 2018). These new values of VTEC were fed into GIMs for the specified stations data. A useful result was obtained for correcting the ionospheric error over kinematic solution of many baseline lengths up to 300 km which demonstrates validity of the proposed evaluation method.

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Improving Precise Point Positioning Convergence Time through TEQC Multipath Linear Combination

Cited by 10 publications

References 23 publications

Analysis of Space-Borne GPS Data Quality and Evaluation of Precise Orbit Determination for COSMIC-2 Mission Based on Reduced Dynamic Method

Analysis of Space-Borne GPS Data Quality and Evaluation of Precise Orbit Determination for COSMIC-2 Mission Based on Reduced Dynamic Method

Performance of Atlas GNSS Global Correction Service for High-Accuracy Positioning

Evaluation of the IGS–Global Ionospheric Mapping model over Egypt

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