TY - JOUR
T1 - The effect of function-based and voxel-based tropospheric tomography techniques on the GNSS positioning accuracy
AU - Haji-Aghajany, Saeid
AU - Amerian, Yazdan
AU - Verhagen, Sandra
AU - Rohm, Witold
AU - Schuh, Harald
PY - 2021
Y1 - 2021
N2 - Tropospheric wet delay, the main source of which is water vapor, is one of the major factors affecting the accuracy of positioning techniques using microwave. Tropospheric tomography is a powerful method to reconstruct the water vapor content in four-dimensional (4D) space. This paper studies the effect of using function-based and voxel-based tropospheric tomography methods on the positioning accuracy. This examination is performed on the static and kinematic positioning modes using Global Navigation Satellite Systems (GNSS) stations under different weather conditions. After validating the results of tomography methods using radiosonde observations, the tomography-based positioning solutions, including function-based and voxel-based approaches, are compared with the positions obtained using tropospheric models. The results of two GPS stations show that the accuracy increases when applying tomography approaches. The function-based tomography is able to increase the accuracy of the up component of the static and kinematic modes by about 0.42 and 0.79 cm, respectively, compared to the voxel-based method. In addition, the use of the function-based tropospheric tomography can decrease the convergence time of the kinematic Precise Point Positioning (PPP) solution.
AB - Tropospheric wet delay, the main source of which is water vapor, is one of the major factors affecting the accuracy of positioning techniques using microwave. Tropospheric tomography is a powerful method to reconstruct the water vapor content in four-dimensional (4D) space. This paper studies the effect of using function-based and voxel-based tropospheric tomography methods on the positioning accuracy. This examination is performed on the static and kinematic positioning modes using Global Navigation Satellite Systems (GNSS) stations under different weather conditions. After validating the results of tomography methods using radiosonde observations, the tomography-based positioning solutions, including function-based and voxel-based approaches, are compared with the positions obtained using tropospheric models. The results of two GPS stations show that the accuracy increases when applying tomography approaches. The function-based tomography is able to increase the accuracy of the up component of the static and kinematic modes by about 0.42 and 0.79 cm, respectively, compared to the voxel-based method. In addition, the use of the function-based tropospheric tomography can decrease the convergence time of the kinematic Precise Point Positioning (PPP) solution.
KW - Function-based
KW - GNSS
KW - Precise Point Positioning
KW - Tropospheric tomography
KW - Voxel-based
UR - http://www.scopus.com/inward/record.url?scp=85108829897&partnerID=8YFLogxK
U2 - 10.1007/s00190-021-01528-2
DO - 10.1007/s00190-021-01528-2
M3 - Article
AN - SCOPUS:85108829897
SN - 0949-7714
VL - 95
JO - Journal of Geodesy
JF - Journal of Geodesy
IS - 7
M1 - 78
ER -