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  • 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
    Format: text
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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
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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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
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    A CloudSat Perspective of the Atmospheric Water Cycle and Precipitation: Recent Progress and Grand Challenges (2012)
    In:  Other Sources
    Details
    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
    Format: text
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    NASA TECHNICAL REPORTS
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