Earthdata Forum

In the RINEX 3 format meaning, it says that CO represents the BDS observation data. However, I cannot find the BDS-3 satellite observation data in CDDIS. For example, I find the observation data in 1, January 2021:https://cddis.nasa.gov/archive/gnss/dat ... 1/001/21o/
There is only one RINEX 3.04 file for one station (twtf). What about the other stations?
And in this file, only two BDS-3 satellites (C27,C37) are included, what about the other BDS-3 satellites?
For those two BDS-3 satellites, only one frequency data is observed, what about the other frequency like C7I?

Where can I find the observation data for BDS-3 staellites?

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CDDIS and the other data centers only archive mixed observation data files. While it is possible to have single observations files, almost all new receivers are multi-constellation and produce mixed observation files – which are also the most useful.

CDDIS is not able to answer which BDS satellites are tracked by certain stations. That would have to be a question to the IGS or the station operators.