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  • Communications and Radar  (4)
  • PHYSICS, GENERAL  (1)
  • SYSTEMS ANALYSIS  (1)
  • 1
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    Titan's Surface from Cassini RADAR SAR and High Resolution Radiometry Data of the First Five Flybys (2007)
    In:  Other Sources
    Details
    Publication Date: 2018-06-11
    Description: The first five Titan flybys with Cassini's Synthetic Aperture RADAR (SAR) and radiometer are examined with emphasis on the calibration and interpretation of the high-resolution radiometry data acquired during the SAR mode (SAR-radiometry). Maps of the 2-cm wavelength brightness temperature are obtained coincident with the SAR swath imaging, with spatial resolution approaching 6 km. A preliminary calibration shows that brightness temperature in these maps varies from 64 to 89 K. Surface features and physical properties derived from the SAR-radiometry maps and SAR imaging are strongly correlated; in general, we find that surface features with high radar reflectivity are associated with radiometrically cold regions, while surface features with low radar reflectivity correlate with radiometrically warm regions. We examined scatterplots of the normalized radar cross-section sigma(exp o) versus brightness temperature, finding differing signatures that characterize various terrains and surface features. Implications for the physical and compositional properties of these features are discussed. The results indicate that volume scattering is important in many areas of Titan's surface, particularly Xanadu, while other areas exhibit complex brightness temperature variations consistent with variable slopes or surface material and compositional properties.
    Keywords: Communications and Radar
    Type: Icarus; Volume 191; No. 1; 211-222
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Cassini RADAR's First Look at Titan (2005)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: The Cassini Titan RADAR Mapper [1] is a Ku-band (13.78 GHz,lambda = 2.17 cm) linear polarized RADAR instrument capable of operating in synthetic aperture (SAR), scatterometer, altimeter and radiometer modes. Radar observations on Titan passes Ta and T3 included rastered scatterometry, SAR, altimetry and rastered radiometry images of a full hemisphere in orthogonal linear polarizations. At this writing only the Ta data have been acquired, but data from both passes will be discussed in the presentation.
    Keywords: Communications and Radar
    Type: Lunar and Planetary Science XXXVI, Part 5; LPI-Contrib-1234-Pt-5
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Use of Radar Backscatter to Infer Aerodynamic Roughness (1995)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Keywords: Communications and Radar
    Type: IGARSS '95; Florence; Italy
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Optical analysis of a compound quasi-microscope for planetary landers (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A quasi-microscope concept, consisting of facsimile camera augmented with an auxiliary lens as a magnifier, was introduced and analyzed. The performance achievable with this concept was primarily limited by a trade-off between resolution and object field; this approach leads to a limiting resolution of 20 microns when used with the Viking lander camera (which has an angular resolution of 0.04 deg). An optical system is analyzed which includes a field lens between camera and auxiliary lens to overcome this limitation. It is found that this system, referred to as a compound quasi-microscope, can provide improved resolution (to about 2 microns ) and a larger object field. However, this improvement is at the expense of increased complexity, special camera design requirements, and tighter tolerances on the distances between optical components.
    Keywords: PHYSICS, GENERAL
    Type: NASA-TN-D-7414 , L-9001
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Toward lowering the cost of mission operations (1993)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The mission operations system is one of the more significant drivers of the cost of the mission operations and data analysis segment of missions. In large or long-lived projects, the MOS can also be a driver in total mission cost. Larger numbers of missions, together with an increasingly cost-conscious environment, dictate that future missions must more strictly control costs as they perform to their requirements. It is therefore prudent to examine the conduct of past missions for ways to conserve resources. In this paper we review inputs made to past projects' 'lessons-learned' activities, in which personnel from past projects (among other things) identified major cost drivers of MOS's and considered how economies were or might have been realized in both design and performance of their MOS. Common themes among four such reviews are summarized in an attempt to provide suggestions for cost reduction in future missions.
    Keywords: SYSTEMS ANALYSIS
    Type: JPL, SpaceOps 1992: Proceedings of the Second International Symposium on Ground Data Systems for Space Mission Operations; p 851-855
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    SRL-1: Radar Scenes of Impact Craters (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: Communications and Radar
    Type: American Geophysical Union, Spring Meeting; May 29, 1995; Baltimore, MD; United States
    Format: text
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    NASA TECHNICAL REPORTS
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