In several sites and observation periods, we find that the vertical error is smaller than the horizontal error after evolving the EGNOS system. The processing used inclued mainly DCB, Ionospheric and tropospheric models,......
Could you explain this, as for positioning using GPS, usually the horizontal precision is better than the vertical precision?
Peut etre une question de contrainte. Les erreurs sont peut-être formelles plutôt que réelles..
A priori plus d'erreur en verical qu'en horizontal.
This can happen due to satellite geometry. You can check this through the DOP value and the satellite sky map.
This can happen for locations with higher latitude values, as the clustering of satellite towards south occurs, occasionally.
Dear Abdul Malik Khan; Thank you for your contribution. Probably, but we used the same observations with the same DOP, and we vertical error with Egnos is less than horizontal one.
Dear Salem Kahlouche,
Can you check the PDOP and HDOP values seperatley.
El Hadi Takka, thanks for your response . We will consider your suggestions
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