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External Ionospheric Files

External Ionospheric Files. Claudia Tierno Ros. Introduction. Ionospheric Correction *. S-Band + X-Band 2.3 GHz 8.4 GHz. VLBI. Fragment from VLBI observation file (NGS file ). * Ionospheric delay depends on number of free electrons along ray path. Introduction. Problem!!.

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External Ionospheric Files

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  1. External Ionospheric Files Claudia Tierno Ros

  2. Introduction Ionospheric Correction* S-Band + X-Band 2.3 GHz 8.4 GHz VLBI Fragment from VLBI observationfile (NGS file) * Ionospheric delaydepends on numberoffreeelectronsalongraypath VieVS User Workshop 2011

  3. Introduction Problem!! Sometimes not possibletoobserve in twofrequencies Solution: Useofexternalionospheric file!! VieVS User Workshop 2011

  4. External Ionospheric Files GNSS TEC maps ↓ IGS / CODE GIMs • Based on Single Layer Model • Latitude/Longituderesolutionof 2.5/5° • Temporal resolution 2 hours • Accuracy 2 to 8 TECU VieVS User Workshop 2011

  5. External Ionospheric Files Fragment fromexternal ionospheric file VieVS User Workshop 2011

  6. Example 1. Start VieVS Processthesessionyouwantasusual VieVS User Workshop 2011

  7. Example 2. Start program C:\Vievs\ION\PROGRAM\GUI\start_createExtIonoFilesGUI.m VieVS User Workshop 2011

  8. Example 3. Select sessionand GIM VieVS User Workshop 2011

  9. Example Weobtainthismessage The GIM hasbeendownloadedfrom IGS/CODE server C:\Vievs\ION\MAPS\[IGS/CODE]\[year] VieVS User Workshop 2011

  10. Example 4. Unzip GIM C:\Vievs\ION\MAPS\[IGS/CODE]\[year] Ifthe VLBI observationstookplace in morethanoneday, 2 maps will bedownloaded VieVS User Workshop 2011

  11. Example 5. Re-run program C:\Vievs\ION\PROGRAM\GUI\start_createExtIonoFilesGUI.m VieVS User Workshop 2011

  12. Example Weobtainthismessage The ionospheric File hasbeencreated! C:\Vievs\ION\[directory chosen] VieVS User Workshop 2011

  13. Example 6. Start VieVS 7. Select session VieVS User Workshop 2011

  14. Example 8. Select externalfile VieVS User Workshop 2011

  15. Example 9. Continueasusual VieVS User Workshop 2011

  16. VieVS User Workshop 2011

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