[IGSMAIL-8399] Announcement of name change for multi-GNSS DCB products on January 23, 2024

[Oliver.Montenbruck at dlr.de]

Dear IGS users,
for the past decade, various analysis centers have contributed differential code bias (DCB) products to the IGS community under the umbrella of the IGS Multi-GNSS Experiment (MGEX) and Pilot Project.  These DCB products support diverse applications such as ionospheric analyses, single point positioning, timing, and performance monitoring of broadcast ephemerides. They aim to support the widest possible range of signals observed with the IGS multi-GNSS station network and complement observable specific code and phase biases (OSBs) that are independently provided for precise point positioning with ambiguity resolution (PPP-AR) along with orbit and clock products by a growing number of IGS analysis centers.
 Recognizing their maturity and aiming at a comprehensive integration of multi-GNSS products into the standard service product portfolio, the IGS has decided to treat the multi-GNSS DCB products as fully operational products. This decision implies that the campaign/project identifier in file names will be changed from "MGX" to "OPS" and the file extension will be changed from "BSX" to "BIA" in accord with the Guidelines for Long File Names in the IGS (see https://files.igs.org/pub/resource/guidelines/Guidelines_For_Long_Product_Filenames_in_the_IGS_v2.0.pdf ).
The switch is scheduled to take place on January 23, 2024. From this date onwards, all multi-GNSS DCB product will be delivered with the revised names. Furthermore, the existing multi-GNSS DCB product holdings at the data centers will be renamed to match the new convention back to GPS week 2237 (= 2022/11/20 = DOY 324 of 2022; marking the introduction of IGS20).
Example: the current file CAS0MGXRAP_20230010000_01D_01D_DCB.BSX.gz will become CAS0OPSRAP_20230010000_01D_01D_DCB.BIA.gz
There will be no change in the location of the respective data, i.e., the DCB products  continue to be provided at URL https://cddis.nasa.gov/archive/gnss/products/bias/<yyyy>/<https://cddis.nasa.gov/archive/gnss/products/bias/%3cyyyy%3e/> (with four-digit year) for CDDIS and  at URL ftp://igs.ign.fr/pub/igs/products/mgex/dcb/<yyyy> for IGN.
 Starting with the transition date, the analysis center of the Chinese Academy of Science has, furthermore, announced to complement their current "CAS0" DCB product with a second version "CAS1" that considers the latest IGS antenna model in the DCB determination for full compatibility with PPP models.
 We encourage all users of the multi-GNSS DCB products to adapt their download scripts and operational processes to enable a seamless operation across the transition.
 With best regards,
 Oliver Montenbruck (Chair MGEX Pilot Project) and Markus Bradke (Infrastructure Committee Coordinator)


Oliver Montenbruck
DLR, German Space Operations Center
Oberpfaffenhofen
D-82234 Wessling
Germany

Tel.    +49 (8153) 28-1195
Fax     +49 (8153) 28-1450
e-mail  oliver.montenbruck at dlr.de<mailto:oliver.montenbruck at dlr.de>

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