Precise Point Positioning Technique with IGS Real-Time Service (RTS) for Maritime Applications

El-Diasty, Mohammed; Elsobeiey, Mohamed

doi:10.4236/pos.2015.64008

Cited by 17 publications

(9 citation statements)

References 9 publications

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“…Our results showed that the developed model improves the solution of Easting, Northing, and Up components. Moreover, using the dual-frequency solution as a reference, the uncertainty of the estimated coordinates using both (traditional and developed) models are at 39% confidence level then transformed to 95% confidence level as follows [30]:…”

Section: Resultsmentioning

confidence: 99%

Stochastic Analysis of Low-Cost Single-Frequency GPS Receivers

Elsobeiey¹

2016

POS

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Typically, dual-frequency geodetic grade GNSS receivers are utilized for positioning applications that require high accuracy. Single-frequency high grade receivers can be used to minimize the expenses of such dual-frequency receivers. However, user has to consider the resultant positioning accuracy. Since the evolution of low-cost single-frequency (LCSF) receivers is typically cheaper than single-frequency high grade receivers, it is possible to obtain comparable positioning accuracy if the corresponding observables are accurately modelled. In this paper, two LCSF GPS receivers are used to form short baseline. Raw GPS measurements are recorded for several consecutive days. The collected data are used to develop the stochastic model of GPS observables from such receivers. Different functions are tested to determine the best fitting model which is found to be 3 parameters exponential decay function. The new developed model is used to process different data sets and the results are compared against the traditional model. Both results from the newly developed and the traditional models are compared with the reference solution obtained from dual-frequency receiver. It is shown that the newly developed model improves the rootmean-square of the estimated horizontal coordinates by about 10% and improves the root-mean-square of the up component by about 39%.

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Section: Resultsmentioning

confidence: 99%

Stochastic Analysis of Low-Cost Single-Frequency GPS Receivers

Elsobeiey¹

2016

POS

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“…Hadas & Bosy (2015) reported that the satellite orbit accuracy of the IGS01 stream was about 5 cm and the satellite clock accuracy was about 0.3 ns and El- Diasty & Elsobeiey (2015) reported that the satellite orbit accuracy was 5 cm and the satellite clock accuracy was 0.5 ns. In previous studies, the result was based on IGS 01.…”

Section: Min-wook Kang Et Al Accuracy Evaluation Of Igs-rts Correctimentioning

confidence: 99%

Accuracy Evaluation of IGS-RTS Corrections to Stand-Alone Positioning Based on GPS Code-Pseudorange Measurements

Kang¹,

Won²,

Kim³

et al. 2016

Journal of Positioning, Navigation, and Timing

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The International GNSS Service (IGS) provides the IGS-Real Time Service (IGS-RTS) corrections that can be used in standalone positioning in real time. In this study, the positioning accuracy before and after the application of the corrections to broadcast ephemeris by applying the IGS-RTS corrections at code pseudo-range based stand-alone positioning was compared with positioning result using precise ephemeris. The analysis result on IGS-RTS corrections showed that orbit error and clock error were 0.05 m and 0.5 ns compared to precise ephemeris and accuracy improved by about 8.5% compared to the broadcast ephemeris-applied result when the IGS-RTS was applied to positioning. Furthermore, regionally dispersed five observatories were selected to analyze the effect of external environments on positioning accuracy and positioning errors according to location and time were compared as well as the number of visible satellites and position dilution of precision by observatory were analyzed to verify a correlation with positioning error.

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“…It is transmitted over the internet based on the Networked Transport of RTCM via Internet Protocol (NTRIP) [ 41 ]. In spite of numerous studies to evaluate the performance of real-time PPP with RTS correction products [ 42 , 43 , 44 , 45 , 46 ], there are few studies, to our knowledge, devoted to real-time coseismic displacement retrieval based on TPP method with RTS correction products.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Coseismic Displacement Retrieval Based on Temporal Point Positioning with IGS RTS Correction Products

Zhang

Nie

Wang

et al. 2021

Sensors

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With the rapid development of the global navigation satellite system (GNSS), high-rate GNSS has been widely used for high-precision GNSS coseismic displacement retrieval. In recent decades, relative positioning (RP) and precise point positioning (PPP) are mainly adopted to retrieve coseismic displacements. However, RP can only obtain relative coseismic displacements with respect to a reference station, which might be subject to quaking during a large seismic event. While PPP needs a long (re)convergence period of tens of minutes. There is no convergence time needed in the variometric approach for displacements analysis standalone engine (VADASE) but the derived displacements are accompanied by a drift. Temporal point positioning (TPP) method adopts temporal-differenced ionosphere-free phase measurements between a reference epoch and the current epoch, and there is almost no drift in the displacement derived from TPP method. Nevertheless, the precise orbit and clock products should be applied in the TPP method. The studies in recent years are almost based on the postprocessing precise orbits and clocks or simulated real-time products. Since 2013, international GNSS service (IGS) has been providing an open-access real-time service (RTS), which consists of orbit, clock and other corrections. In this contribution, we evaluated the performance of real-time coseismic displacement retrieval based on TPP method with IGS RTS correction products. At first, the real-time precise orbit and clock offsets are derived from the RTS correction products. Then, the temporal-differenced ionosphere-free (IF) combinations are formed and adopted as the TPP measurements. By applying real-time precise orbit and clock offsets, the coseismic displacement can be real-timely retrieved based on TPP measurements. To evaluate the accuracy, two experiments including a stationary experiment and an application to an earthquake event were carried out. The former gives an accuracy of 1.8 cm in the horizontal direction and 4.1 cm in the vertical direction during the whole period of 15-min. The latter gives an accuracy of 1.2 cm and 2.4 cm in the horizontal and vertical components, respectively.

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Precise Point Positioning Technique with IGS Real-Time Service (RTS) for Maritime Applications

Abstract: Abstract

Cited by 17 publications

References 9 publications

Stochastic Analysis of Low-Cost Single-Frequency GPS Receivers

Stochastic Analysis of Low-Cost Single-Frequency GPS Receivers

Accuracy Evaluation of IGS-RTS Corrections to Stand-Alone Positioning Based on GPS Code-Pseudorange Measurements

Real-Time Coseismic Displacement Retrieval Based on Temporal Point Positioning with IGS RTS Correction Products

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