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The Soil Moisture Active Passive (SMAP) Mission

The Soil Moisture Active Passive (SMAP) mission is one of the first Earth observation satellites being developed by NASA in response to the National Research Council's Decadal Survey. SMAP will make…
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SMAP Handbook–Soil Moisture Active Passive: Mapping Soil Moisture and Freeze/Thaw from Space

New Ocean Winds Satellite Mission to Probe Hurricanes and Tropical Convection

AbstractThe Cyclone Global Navigation Satellite System (CYGNSS) is a new NASA earth science mission scheduled to be launched in 2016 that focuses on tropical cyclones (TCs) and tropical convection.…
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A novel acceleration algorithm for the computation of scattering from rough surfaces with the forward‐backward method

The forward‐backward method has been shown to be an effective iterative technique for the computation of scattering from one‐dimensional rough surfaces, often converging rapidly even for very large…
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Theoretical study of the small slope approximation for ocean polarimetric thermal emission

  • J. JohnsonMin Zhang
  • Environmental Science, Physics
    IEEE Transactions on Geoscience and Remote…
  • 1 September 1999
This paper presents a detailed analysis of the SPM/small slope approximation (SPM/SSA) for ocean surface polarimetric thermal emission, and investigates the extent to which varying ocean surface length scales contribute to brightness temperature zeroth and second azimuthal harmonics.
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Cognitive Radar Framework for Target Detection and Tracking

This paper develops a general cognitive radar framework for a radar system engaged in target tracking that includes the higher-level tracking processor and specifies the feedback mechanism and optimization criterion used to obtain the next set of sensor data.
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An efficient two-scale model for the computation of thermal emission and atmospheric reflection from the sea surface

  • J. Johnson
  • Environmental Science, Mathematics
    IEEE Transactions on Geoscience and Remote…
  • 21 February 2006
An efficient implementation of the two-scale model of sea surface thermal emission and atmospheric reflection is described and results show that reflected downwelling radiation can increase azimuthal variations of total observed brightnesses.
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Radio-Frequency Interference Mitigation for the Soil Moisture Active Passive Microwave Radiometer

The Soil Moisture Active Passive radiometer operates in the L-band protected spectrum that is known to be vulnerable to radio-frequency interference, and takes a multidomain approach to RFI mitigation by utilizing an innovative onboard digital detector back end with digital signal processing algorithms.
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Tests of the SMAP Combined Radar and Radiometer Algorithm Using Airborne Field Campaign Observations and Simulated Data

Results indicate that the algorithm has the potential to retrieve soil moisture at 9-km resolution, with the accuracy required for SMAP, over regions having vegetation up to 5- kg/m2 vegetation water content.
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Time-Series Retrieval of Soil Moisture Using CYGNSS

Comparisons suggest that there exists the potential for using spaceborne GNSS-R systems for global soil moisture retrievals with an rms error on the order of 0.04 cm3/cm3 over varied terrain.
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