AFRC-Trop: New Real-Time Zenith Tropospheric Delay Model over Africa

Abdelazeem, Mohamed

doi:10.1061/(asce)su.1943-5428.0000348

Cited by 3 publications

(3 citation statements)

References 37 publications

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“…Although the height factor has been considered by the GPT3 model when calculating the corresponding P and T at GNSS stations [19], the height-related residual still existed for regions, especially in China with large height differences. Similarly, the developed ZTD models without considering the height factor, such as the ISAAS model [44], the GHOP model [22], and the AFRC-TROP model [23], are significantly affected by height. Therefore, the relationship between ZTD periodical residual and height is further explored in this section.…”

Section: Relationship Analysis Between Ztd Periodical Residual and He...mentioning

confidence: 99%

“…The IGGtrop_SH model considers the changes in annual and semiannual periods of ZTD, while the IGGtrop_rH model only considers the annual period. In addition to the above models, other models, such as the Global Zenith Tropospheric Delay (GZTD) [2], [8], Global Tropospheric Model (GTrop) [21], Global Hopfield (GHop) model [22], and Africa Tropospheric (AFRC-Trop) model [23] have been proposed and validated on regional or global scales with fluctuating accuracies between 3.5 to 4.2 cm.…”

Section: Introductionmentioning

confidence: 99%

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High-Precision ZTD Model of Altitude-Related Correction

Zhao

Jing

et al. 2023

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Section: Relationship Analysis Between Ztd Periodical Residual and He...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-Precision ZTD Model of Altitude-Related Correction

Zhao

Jing

et al. 2023

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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“…The PPP technique can be used in a number of precise applications. Examples of these applications include precise surveying, hydrographic survey, disaster monitoring, atmospheric sounding and space weather applications [3][4][5][6][7]. Unfortunately, however, the main limitation of the PPP solution is that it needs a long time to converge to centimeter or decimeter positioning accuracy.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Triple-Frequency GPS/Galileo Techniques for Precise Static and Kinematic Applications

Rabbou

Abdelazeem

Morsy

2021

Sensors

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The objective of this research was to develop new precise point positioning (PPP) processing models using triple-frequency GPS/Galileo observations. Different triple-frequency PPP models were developed including undifferenced, between-satellite single-difference (BSSD) and semi-decoupled PPP models. Additionally, a dual-frequency ionosphere-free undifferenced PPP model was developed. The performance of our developed PPP models was evaluated for both static and kinematic applications. To validate the proposed PPP models for static applications, triple-frequency GPS/Galileo observations spanning three successive days from eight globally distributed reference stations were acquired. Then, the observations were processed using the four static PPP solutions. It is found that the 3D positioning accuracy of the triple-frequency semi-decoupled, BSSD and undifferenced PPP models is enhanced after 10 min by about 50, 41 and 29%, respectively, compared with the dual-frequency undifferenced PPP model. After 20 min of processing, improvements in the 3D positioning accuracy by 40, 31 and 21% are obtained for the triple-frequency semi-decoupled, BSSD and undifferenced PPP models, respectively, with respect to the dual-frequency PPP model. The 3D positioning accuracy is also improved after 60 min, compared with the dual-frequency solution, by 40, 40 and 35% for the triple-frequency semi-decoupled, BSSD and undifferenced PPP solutions, respectively. For kinematic application validation, a vehicle trajectory was carried out. The collected triple-frequency GPS/Galileo observations were processed using the four kinematic PPP solutions. It is shown that the triple-frequency semi-decupled, BSSD and undifferenced PPP solutions enhance the 3D positioning accuracy by 31, 23 and 10%, respectively, in comparison with the dual-frequency undifferenced PPP solutions.

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A high-precision ZTD interpolation method considering large area and height differences

Zhao,

Wang,

et al. 2023

GPS Solut

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AFRC-Trop: New Real-Time Zenith Tropospheric Delay Model over Africa

Cited by 3 publications

References 37 publications

High-Precision ZTD Model of Altitude-Related Correction

High-Precision ZTD Model of Altitude-Related Correction

Performance Evaluation of Triple-Frequency GPS/Galileo Techniques for Precise Static and Kinematic Applications

A high-precision ZTD interpolation method considering large area and height differences

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