Search found 60 matches

by CDDIS_support_Lori
Tue Sep 27, 2022 4:56 pm America/New_York
Forum: Questions/Comments
Question: Questions regarding Hourly updates of RINEX FIles
Replies: 1

Re: Questions regarding Hourly updates of RINEX FIles

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...
by CDDIS_support_Lori
Wed Aug 10, 2022 12:54 pm America/New_York
Forum: Questions/Comments
Question: Motion of geosynchronous orbits
Replies: 1

Re: Motion of geosynchronous orbits

We are passing this question along to our science community.
by CDDIS_support_Lori
Wed Aug 10, 2022 12:53 pm America/New_York
Forum: Questions/Comments
Question: Motion of geosynchronous orbits
Replies: 1

Motion of geosynchronous orbits

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...
by CDDIS_support_Lori
Fri Jul 08, 2022 11:57 am America/New_York
Forum: Questions/Comments
Question: ERP and SP3 file missing
Replies: 1

Re: ERP and SP3 file missing

The files should be available now.
by CDDIS_support_Lori
Fri Jul 08, 2022 11:55 am America/New_York
Forum: Questions/Comments
Question: How to download the gnss product from cddis with C#
Replies: 1

Re: How to download the gnss product from cddis with C#

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
by CDDIS_support_Lori
Wed May 11, 2022 1:35 pm America/New_York
Forum: Questions/Comments
Question: Question about .sp3 files
Replies: 1

Re: Question about .sp3 files

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...
by CDDIS_support_Lori
Wed May 11, 2022 1:31 pm America/New_York
Forum: Questions/Comments
Question: Question about .sp3 files
Replies: 1

Question about .sp3 files

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...
by CDDIS_support_Lori
Mon Apr 18, 2022 1:24 pm America/New_York
Forum: Questions/Comments
Question: GNSS分析软件
Replies: 1

Re: GNSS分析软件

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 ...
by CDDIS_support_Lori
Thu Jan 27, 2022 12:49 pm America/New_York
Forum: Questions/Comments
Question: GPS-satellite data, how do i open?
Replies: 1

Re: GPS-satellite data, how do i open?

The files are gzipped and can be unzipped using the Unix command "gunzip". The resulting file can be opened in any text editor.
by CDDIS_support_Lori
Tue Oct 19, 2021 12:07 pm America/New_York
Forum: Questions/Comments
Question: BDS observation data download
Replies: 2

Re: BDS observation data download

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 ...