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  • ELECTRONIC SYSTEMS  (4)
  • SPACECRAFT INSTRUMENTATION  (3)
  • Meteorology and Climatology; Communications and Radar  (1)
  • 1
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    Conceptual design of a spaceborne radar for rain and cloud sensing (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A conceptual design for a mid-latitude orbiting precipitation and cloud mapping radar is discussed. In this conceptual design the radar utilizes a narrow, dual-frequency beam, electronically scanned antenna to achieve 4-km spatial resolution and 300-km cross-track swath. Vertical resolution of 500 m is achieved by short-pulse transmission. It is expected that such system can measure rain rates up to 100 mm/hr for precipitation at the cloud base, surface precipitation up to 20 mm/hr, and cloud reflectivities as low as -39 dBz. By averaging over 100 independent samples, signal reflectivities can be estimated to better than 20 percent. Other rain and cloud characteristics, such as height, thickness, and cell size, can also be extracted from the data.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: In: Atmospheric propagation and remote sensing; Proceedings of the Meeting, Orlando, FL, Apr. 21-23, 1992 (A93-37102 14-74); p. 363-369.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Cassini Titan Radar Mapper (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The Cassini Titan Radar Mapper is a multimode radar instrument designed to probe the optically inaccessible surface of Titan, Saturn's largest moon. The instrument is to be included in the payload of the Cassini Saturn Mission, scheduled for launch in 1995. The individual modes of Cassini Radar Mapper will allow topographic mapping and surface imaging at few hundred meters resolution. The requirements that lay behind the design are briefly discussed, and the configuration and capability of the instrument are described. The present limited knowledge of Titan's surface and the measurement requirements imposed on the radar instrument are addressed. Also discussed are the Cassini mission and the projected orbits, which imposed another set of design constraints that led to the multitude of modes and to an unconventional antenna configuration. The antenna configuration and the different radar modes are described.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: IEEE, Proceedings (ISSN 0018-9219); 79; 867-880
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    NASA TECHNICAL REPORTS
  • 3
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    Tropical rain mapping radar on the Space Station (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The conceptual design for a tropical rain mapping radar for flight on the manned Space Station is discussed. In this design the radar utilizes a narrow, dual-frequency (9.7 GHz and 24.1 GHz) beam, electronically scanned antenna to achieve high spatial (4 km) and vertical (250 m) resolutions and a relatively large (800 km) cross-track swath. An adaptive scan strategy will be used for better utilization of radar energy and dwell time. Such a system can detect precipitation at rates of up to 100 mm/hr with accuracies of roughly 15 percent. With the proposed space-time sampling strategy, the monthly averaged rainfall rate can be estimated to within 8 percent, which is essential for many climatological studies.
    Keywords: SPACECRAFT INSTRUMENTATION
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    NASA TECHNICAL REPORTS
  • 4
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    Radar For Measuring Vertical Cloud Structure (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Proposed radar system views clouds from above and measures their vertical structures with resolution of 500 m. Two versions of system; initial developmental version to be flown aboard aircraft and final version flown aboard spacecraft in circular orbit around Earth at altitude of 400 km.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-19495 , NASA Tech Briefs (ISSN 0145-319X); 19; 7; P. 43
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    NASA TECHNICAL REPORTS
  • 5
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    Suppression Of Range Sidelobes In Spaceborne Rain-Mapping Radar (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Adequate suppression of range sidelobes in chirp pulse-compression radar system for spaceborne rain-mapping application demonstrated in operation of aircraft version of system. Radar system operates at center frequency of 13.8 GHz, developed for operation aboard NASA DC-8 aircraft to measure vertical rainfall-rate profiles and rain-cell dimensions. Sidelobes suppressed by at least 55 dB. Technique applied to other frequencies, therefore, useful in other radar systems in which low sidelobes at mid to far range needed.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-18515 , NASA Tech Briefs (ISSN 0145-319X); 18; 5; P. 85
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    NASA TECHNICAL REPORTS
  • 6
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    Spaceborne Radar Would Measure Rain And Clouds (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Report describes conceptual design of spaceborne radar system mapping precipitation and clouds at mid-latitudes to provide data for research on global weather and climate. Radar operates at two frequencies. Lower (35 GHz) provides vertical profiles of rainfall at rates up to 20 mm/h and enables probing of cirrus clouds. Higher (94 GHz) enables detection and quantitative measurements of clouds of all types and provides rain profiles at rates up to 10 mm/h.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-18274 , NASA Tech Briefs (ISSN 0145-319X); 16; 7; P. 44
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    NASA TECHNICAL REPORTS
  • 7
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    Radar Altimetry For Topographical Mapping (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Two altimeter concepts based on spaceborne synthetic-aperture-radar (SAR) proposed to gather global, uniformly sampled, high-resolution, topographical data on land and ice. Wide swath and high pulse rate of SAR makes possible to acquire spatially contiguous data over large areas in reasonable amount of time, and time needed for altimetric processing of SAR data considerably less than that needed to generate topographical maps from stereoscopic photographs. Radar less vulnerable to cloud cover and other weather conditions than optical techniques.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-18254 , NASA Tech Briefs (ISSN 0145-319X); 16; 10; P. 37
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    NASA TECHNICAL REPORTS
  • 8
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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
    Format: text
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    NASA TECHNICAL REPORTS
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