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SMAP Radiometer RFI Study Status Review

SMAP Radiometer RFI Study Status Review. Roadmap and schedule Radar study output PALS/ADDS flights Path forward. Study Roadmap. Modeled Radar RFI. < 1% of data has RFI > 1K. PALS Flight Summary for SMAPVEX08. SMAPVEX08 from September 22 through October 19, 2008

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SMAP Radiometer RFI Study Status Review

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  1. SMAP Radiometer RFI StudyStatus Review Roadmap and schedule Radar study output PALS/ADDS flights Path forward Piepmeier - SDT Meeting #1

  2. Study Roadmap Piepmeier - SDT Meeting #1

  3. Modeled Radar RFI < 1% of data has RFI > 1K Piepmeier - SDT Meeting #1

  4. PALS Flight Summary for SMAPVEX08 • SMAPVEX08 from September 22 through October 19, 2008 • Not inc. 1 week installation at Grand Junction • Total of 92 Flight hours • 21 PALS-ADD flights on the Twin Otter • 3 science flights in IOWA (12 flight hours) • 8 science flights in Delaware (37 flight hours) • 10 RFI/Transit flights (~ 20 flight hours) Piepmeier - SDT Meeting #1

  5. PALS/ADDS RFI Flights Piepmeier - SDT Meeting #1

  6. Preliminary PALS RFI Mitigation AlgorithmLine 7 E-W, 3 Oct 2008 • Double-Median-Filtering/Threshold Algorithm • The first median filter is applied to the data from 7 antenna steps within one data block • The second median filter determines an RFI flag to the data block centered within a window of multiple data blocks. • Tv data only flag, Th data only flag, Tv-Th data flag After Filtering

  7. Pulsed-RFI Statistics from GSFC Detector ~10% of data has Pulsed RFI > 1K Mean RFI for each of 22 flights Mean RFI for each of 378 11-minute legs RFI in each of 4.77M 20-ms samples Mean RFI for each of 8082 30-sec footprints Piepmeier - SDT Meeting #1

  8. Aggregate-RFI Statistics from UMICH ADD ~10% of data has RFI > 1K (All flights) Piepmeier - SDT Meeting #1

  9. CW RFI Statistics – UMICH ADD ~1% of data has CW-type RFI > 1K NY City and surrounding Piepmeier - SDT Meeting #1

  10. Non-Radar RFI Example: New York Note: In band RFI! Piepmeier - SDT Meeting #1

  11. Non-Radar RFI Example: New Jersey Note: In band RFI! Piepmeier - SDT Meeting #1

  12. WMTS: Rural Virginia • 4876 community hospitals in CONUS (2004 US Census) • Average ~1 hospital per SMAP footprint, but they will clump Piepmeier - SDT Meeting #1

  13. Discussion • Results • Radar interference about 10X worse than expected • CW-type interference about 1/10 occurrence-rate of pulsed-interference • CW-type interference concentrated in urban areas, but very strong • SDT Help • Science Impact • Level 2 Data loss requirement • Issues with repeated denial-of-service in fixed locations? • Small working group to help • How to extrapolate aircraft to satellite? • Peer-review results Piepmeier - SDT Meeting #1

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