[IGSMAIL-8278] DCB and OSB from GFZ MGEX RAPID products

[Zhiguo Deng]

Dear colleagues,


It's our pleasure to announce a recent upgrade of GFZ MGEX rapid products, 
starting from day 2022/321.



1) in GBM0MGXRAP_20223210000_01D_01D_REL.BIA.gz

We provide the daily P1P2 DCB bias of the satellites and stations. To 
estimate the DCB the GFZ rapid ionosphere product are introduced (Brack, A., 
Männel, B., Wickert, J., Schuh, H. (2021): Operational Multi‐GNSS Global 
Ionosphere Maps at GFZ Derived from Uncombined Code and Phase Observations. 
- Radio Science.).

The observations for the POD are taken for the DCB estimation using GFZ 
EPOS8 software, which make more consistent solution with our POD products.



2) in GBM0MGXRAP_20223210000_01D_01D_OSB.BIA.gz

The OSB are now converted from UPD and the new DCB product.


In the updated DCB&OSB products the PCO/PCV corrections are applied for the 
satellite and station. We follow the IGS conventional, intoducing « 
 APC_MODEL IGS14_2188 » keyword  in the BIAS/DESCRIPTION block.



Please feel free to contact me if you have any question about these 
products.


Best regards,


Zhiguo Deng