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Dear ARK, Thank you for your question. In order to create the hourly files, the CDDIS requires input from external sources. These sources upload the files hourly so the CDDIS cannot create the hourly files in less than an hour. Though the input files are supposed to be uploaded hourly, sometimes the...

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I am interested in the motion of geosynchronous orbits. I am looking for a drifting geosynchronous satellite equipped with laser retroreflectors for which I could find a precise ephemeris. I am looking for an ephemeris approximately 120 days in length. An accuracy of 1 to 5 meters would be sufficien...

The files should be available now.

We do not have an example for downloading data via C#. We have examples using other techniques at:

https://cddis.nasa.gov/Data_and_Derived_Products/CDDIS_Archive_Access.html

You have the correct directory locations for the different sp3 files. The short name sp3 files are located in https://cddis.nasa.gov/archive/gnss/products/ , and the long name ones are in https://cddis.nasa.gov/archive/gnss/products/mgex . You just need to add the GPS week subdirectory you want afte...

I am writing to ask how to find a .sp3 file with full records in CDDIS. I tried to get through all .sp3 files in " https://cddis.nasa.gov/archive/gnss/products/ " and " https://cddis.nasa.gov/archive/gnss/products/mgex " and did not find a right one which was like that dipicted i...

The CDDIS is a separate archive from BKG, so we are not responsible for their data. The BKG data center has been experiencing an outage since Mar. 25. The CDDIS does not archive BRDC*GN.rnx files. We only have the mixed navigation files with name format, BRDC*MN.rnx. The BRDC files available at the ...

The files are gzipped and can be unzipped using the Unix command "gunzip". The resulting file can be opened in any text editor.

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 ...