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Utilizing External Ionospheric Files for S-Band and X-Band VLBI Observations

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This workshop presentation by Claudia Tierno Ros at the VieVS User Workshop 2011 discusses the challenges of observing ionospheric delays in two frequencies and presents solutions using external ionospheric files. Focusing on GNSS TEC maps derived from CODE GIMs, the talk covers single-layer models, accuracy, and temporal and spatial resolution. Practical examples demonstrate how to create and utilize these files in the VieVS software for improved VLBI observations, highlighting steps to manage downloaded maps and integrate them into the processing workflow.

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Utilizing External Ionospheric Files for S-Band and X-Band VLBI Observations

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Presentation Transcript

  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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