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  • Earth Resources and Remote Sensing  (4)
  • Geophysics  (1)
  • Meteorology and Climatology; Communications and Radar  (1)
  • 1
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    SAR Ambiguity Study for the Cassini Radar (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: The Cassini Radar's synthetic aperture radar (SAR) ambiguity analysis is unique with respect to other spaceborne SAR ambiguity analyses owing to the non-orbiting spacecraft trajectory, asymmetric antenna pattern, and burst mode of data collection. By properly varying the pointing, burst mode timing, and radar parameters along the trajectory this study shows that the signal-to-ambiguity ratio of better than 15 dB can be achieved for all images obtained by the Cassini Radar.
    Keywords: Earth Resources and Remote Sensing
    Type: IEEE IGARSS '93 Geoscience and Remote Sensing; Tokyo; Japan
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    NASA TECHNICAL REPORTS
  • 2
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    Development Status of Cassini Radar For Remote Sensing of Titan (1994)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Cassini Radar is a multimode rada instrument designed to probe the optically inaccessible surface of Titan, Saturn's largest moon. The individual modes will allow surface imaging, surface emissivity measurements. Recently, the breadboard model of this instrument was built and has undergone a series of functional and perfomance tests. The results obtained from these tests indicate that the instrument design is satisfactory and that the various required performance parameters are suffieciently met.
    Keywords: Earth Resources and Remote Sensing
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  • 3
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    Global variability of precipitation according to the Tropical Rainfall Measuring Mission (2004)
    In:  Other Sources
    Details
    Publication Date: 2018-06-11
    Description: Numerous studies have documented the effect of El Nino-Southern Oscillation (ENSO) on rainfall in many regions of the globe. The question of whether ENSO is the single most important factor in interannual rainfall variability has received less attention, mostly because the kind of data that would be required to make such an assessment were simply not available. Until 1979 the evidence linking El Nino with changes in rainfall around the world came from rain gauges measuring precipitation over land masses and a handful of islands. From 1980 until the launch of the Tropical Rainfall Measuring Mission (TRMM) in November 1997 the remote sensing evidence was confined to ocean rainfall because of the very poor sensitivity of the instruments over land. In this paper we summarize the results of a principal component analysis of TRMM's 60-month (January 1998 to December 2002) global land and ocean remote-sensing record of monthly rainfall accumulations. Contrary to the first principal component of the rainfall itself, the first three indices of the anomaly are most sensitive to precipitation over the ocean rather than over the land. With the help of archived surface station data the first TRMM rain anomaly index is extended back several decades. Comparison of the extended index with the Southern Oscillation Index confirms that the first principal component of the rainfall anomaly is strongly correlated with the ENSO indices.
    Keywords: Geophysics
    Type: Journal of Geophysical Research; Volume 109; D17103
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  • 4
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    Conceptual design of a geostationary radar for hurricane studies (2003)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A novel 35-GHz Doppler radar instrument concept and the associated critical technologies are being developed for detailed monitoring of hurricanes and severe storms from a geostationary orbit. This instrument is designed to make quantitative rainfall rate profiling measurements at 13-km horizontal resolution and 300-m vertical resolution, and the radial Doppler velocity at 0.3 m/s precision, of the 3-D hurricane structure once per hour throughout its life cycle.
    Keywords: Earth Resources and Remote Sensing
    Type: International Symposium of Remote Sensing of Environment; Nov 10, 2003 - Nov 14, 2003; Honolulu, HI; United States
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  • 5
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    A CloudSat Perspective of the Atmospheric Water Cycle and Precipitation: Recent Progress and Grand Challenges (2012)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Summary Global - mean precipitation - is controlled by Earth's energy balance and is a quantifiable consequence of the water vapor feedback. Predictability rests on the degree to which the water vapor feedback is predictable. Regional scale - to a significant extent, changes are shaped by atmospheric circulation changes but we do not know the extent to which regional scale changes are predictable. The impacts of changes to atmospheric circulation on regional scale water cycle changes can be dramatic. Process - scale - significant biases to the CHARACTER of precipitation (frequency and intensity) is related to how the precipitation process is parameterized in models. Aerosol - We still do not know the extent to which the water cycle is influenced by aerosol but anecdotal evidence is building. The character of precipitation is affected by the way aerosol influence clouds and thus affects the forcing of the climate system through the albedo effect. Observations - we still have a way to go and need to approach the problem in a more integrated way (tie clouds, aerosol and precipitation together and then link to soil moisture, etc). Globally our capabilities seriously lag behind the science and model development.
    Keywords: Earth Resources and Remote Sensing
    Type: SPIE Asia-Pacific Remote Sensing 2012; Oct 29, 2012 - Nov 01, 2012; Kyoto; Japan
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  • 6
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    NEXRAD in Space (NIS): A Geostationary Orbiting Doppler Radar for Hurricane Monitoring and Studies (2011)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Meteorology and Climatology; Communications and Radar
    Type: Advanced RF Sensors and Remote Sensing Instruments Workshop; Sep 13, 2011 - Sep 15, 2011; Noordwijk; Netherlands
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