Mitigation Type

Mitigation Time/Frequency Resolution

Performance Achieved

Comments

Frequency subchannels

36 ms/3 MHz

Pulsed RFI ranging between 1-13 K in 20 MHz detected and removed (post-processing)

 

Time blanking

40 microsec/20 MHz

Real-time removal of pulsed RFI ranging between 1-20 K in 20 MHz

 

Time blanking

0.5 s/20 MHz

Pulsed RFI ranging between 1 K and 10-15 K in 20 MHz detected and removed (post-processing)

 

Time blanking

8 ms/20 MHz

Pulsed RFI ranging from 0.1 to 45 K detected and removed (post-processing)

 

Cross-frequency

26 ms/0.1 MHz

Narrowband RFI ranging from 1-45 K in 100 MHz detected and removed

 

Cross-frequency

26 ms/0.1 MHz

Wideband RFI ranging from 10-100 K detected and removed

Removal of wideband RFI eliminates large portions of usable radiometer bandwidth; detection possible only when RFI power/MHz substantially exceeds that of noise.

Cross-frequency

26 ms/400 MHz

Wideband RFI ranging from ~5-300 K removed

Removal of wideband RFI eliminates large portions of usable radiometer bandwidth; detection possible only when RFI power/MHz substantially exceeds that of noise.

None

None

None

Not possible to detect RFI that resembles thermal noise.

[4] J.T. Johnson, A.J. Gasiewski, B. Guner, G.A. Hampson, S.W. Ellingson, R. Krishnamachari, N. Niamsuwan, E. McIntyre, M. Klein, and V.Y. Leuski, “Airborne Radio-Frequency Interference Studies at C-Band Using a Digital Receiver,” IEEE Transactions on Geoscience and Remote Sensing, 44(7, Part 2): 1974-1985 (July 2006).

[5] A.J. Gasiewski, M. Klein, A.Yevgrafov, and V. Leuskiy, “Interference Mitigation in Passive Microwave Radiometry,” Proceedings of the 2002 International Geoscience and Remote Sensing Symposium, Toronto, Ontario, Canada, June 24-28, 2002.



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