3_Igarss2011RFI.ppt

SMAP- SMAP- JPL/Caltech proprietary. Not for public release or redistribution. For planning and discussion purposes only. National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Pasadena, California National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Pasadena, California Radio Frequency Interference Mitigation for the Planned SMAP Radar and Radiometer Michael Spencer, Samuel Chan , Eric Belz Jet Propulsion Laboratory, California Institute of Technology Jeffrey Piepmeier, Priscilla Mohammed, Edward Kim NASA’s Goddard Space Flight Center Joel T. Johnson The Ohio State University

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object]

Motivation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Users of L-Band Spectrum ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

RFI and SMAP Error Budget ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

RFI approach for SMAP radiometer

Describing the RFI Environment ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

SMOS Detected RFI Occurrence Probability: March-April 2010

SMAP Airborne RFI Campaigns ,[object Object],[object Object],[object Object],[object Object],Spectrogram during overflight of New York City Statistics show low-level RFI common

How to Mitigate? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],24 MHz @ 1.4 GHz 1 2 3 …. 16

Initial Performance Study: Fullband ,[object Object],[object Object],[object Object],[object Object]

Initial Performance Study: Sub-channels ,[object Object],[object Object],[object Object],[object Object]

SMAP Radar RFI sources ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Summary of RFI Mitigation Design (1 of 2) RFI ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Requirement/Allocation: RFI shall not contribute more than 0.4 dB 1-sigma to the backscatter measurement. Up to 2% of the data can is allowed to be flagged “ bad data ” where RFI is too excessive to mitigate. HH HV noise RF Bandwidth (100 MHz acceptance) IF, Digital System Bandwidth, 5 MHz 1 MHz

Summary of RFI Mitigation Design (2 of 2) ,[object Object],[object Object],[object Object],[object Object],[object Object],PALSAR example Range lines Successive pulses One vertical cut of left image Power threshold

Modeling of Ground Based Emitters ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Assessment of Ground Emitters Using Current L-Band Data Sets ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Modeling Impact of Satellite Transmissions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],http://smap.jpl.nasa.gov/

3_Igarss2011RFI.ppt

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3_Igarss2011RFI.ppt