Search found 78 matches
- 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...
- 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.
- 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
https://cddis.nasa.gov/Data_and_Derived_Products/CDDIS_Archive_Access.html
- 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...
- 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...
- 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 ...
- 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.
- 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 ...
- Tue Aug 24, 2021 11:38 am America/New_York
- Forum: Questions/Comments
- Question: Can't download any MGEX files
- Replies: 1
Re: Can't download any MGEX files
There could have been network issues when you were trying to download. Things are working now. Please try again.
Best regards
Best regards
- Thu Aug 05, 2021 2:30 pm America/New_York
- Forum: Questions/Comments
- Question: download multi-files from different folders
- Replies: 1
Re: download multi-files from different folders
Try port 21 instead of 22. That should work for you. As for downloading multiple files from different directories, there is not one command that can make that work. You will have to code something that runs on your client machine to go into various directories and download files from there. We have ...