Changes between Version 8 and Version 9 of Processing/POSPac


Ignore:
Timestamp:
Sep 27, 2022, 12:03:43 PM (4 months ago)
Author:
wja
Comment:

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  • Processing/POSPac

    v8 v9  
    4747}}}
    4848
     49You may also need to access Precise Ephemeris data for the basestation durations. This is not included in OS basestation data and is required for the 'IN-Fusion SmartBase' processing that is preferred if multiple basestations are available.
    4950
    50  * These RINEX files can then be imported with Project > Import.
     51Precise ephemeris data can be accessed from CDDIS:
     52
     53https://urs.earthdata.nasa.gov/oauth/authorize?client_id=gDQnv1IO0j9O2xXdwS8KMQ&redirect_uri=https%3A%2F%2Fcddis.nasa.gov%2Fproxyauth&response_type=code&state=aHR0cDovL2NkZGlzLm5hc2EuZ292L2FyY2hpdmUvZ25zcy9wcm9kdWN0cy8
     54
     55Naming convention is:
     56
     57`AAAWWWWD.sp3`
     58
     59Where AAA is the processing site, WWWW is GPS week, D is day of week in GPS week terms and the extension for precise ephemeris data is `*.sp3` (there are also orbit and clock data available here if it is needed).
     60
     61E.g `esa22234.sp3` is a precise ephemeris file produced by ESA for GPS week 2223 day 4 (Thu 18 August 2022). Note that Sun = 0 and Sat = 6.
     62
     63You can find out the GPS week here: https://www.ngs.noaa.gov/CORS/Gpscal.shtml
     64
     65Back in POSPac:
     66
     67 * These RINEX files (basestation observations + ephemeris data) can then be imported with Project > Import.
    5168 * If imported basestation data doesn't include ephemeris data, this also needs downloading (OS basestation RINEX data only includes the *.o file, which is just the GNSS measurements rather than the meteorological and ephemeris files).
    5269  * Project > Find Base Stations > Select None > Tick all Precise Ephemeris and Broadcast Ephemeris rows, click "Download and Import" to download, then click "Download and Import" again to import.