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  • Other Sources  (17)
  • Earth Resources and Remote Sensing  (10)
  • LAUNCH VEHICLES AND SPACE VEHICLES  (6)
  • GENERAL
  • 2015-2019  (3)
  • 1990-1994  (14)
  • 1
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    Manned Mars aerobrake vehicle design issues (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: Space Technology - Industrial and Commercial Applications (ISSN 0892-9270); 12; 3; p. 313-324.
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    NASA TECHNICAL REPORTS
  • 2
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    Advanced manned launch system study status (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: Space Technology - Industrial and Commercial Applications (ISSN 0892-9270); 13; 3; p. 349-362.
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  • 3
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    Development of SIR-C Ground Calibration Equipment (1993)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Description: SIR-C/X-SAR is currently scheduled for launch in April 1994. SIR-C is an L-Band and C-Band, multi-polarization spaceborne SAR system developed by NASA/JPL. X- SAR is an X-Band SAR system developed by DARA/ASI. One of the problems involved in calibrating the SIR-C instrument is to make sure that the horizontal (H) and vertical (V) polarized beams are aligned in the azimuth direction, i.e.. that they are pointing in the same direction. This is important if the polarimetric performance specifications for the system are to be met. To solve this problem, we have designed and built a prototype of a low-cost ground receiver capable of recording received power from two antennas, one H-polarized, the other V-polarized. The two signals are mixed to audio then recorded on the left and right stereo channels of a standard audio cassette player. The audio cassette recording can then be played back directly into a Macintosh computer, where it is digitized. Analysis of.
    Keywords: Earth Resources and Remote Sensing
    Type: IEEE, Geoscience and Remote Sensing; Tokyo; Japan
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  • 4
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    The Effects of Noise on Polarimetric SAR Data (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Polarimetric SAR data can provide a great deal of information about the scattering behavior of the surface under observation. Polarimetric SAR systems often measure the scattering matrices of the areas under observation in linear polarizations (H and V). From the scattering matrix commonly used forms such as the covariance matrix and the Stokes matrix can be easily derived. Other measures derived from polarimetric SAR data include the standard deviation of texture, correlation coefficients between scattering matrix terms, and the mode and variance of phase differences between scattering matrix terms. The effects of additive system noise on these measurements is not often considered in the literature on this subject.
    Keywords: Earth Resources and Remote Sensing
    Type: IEEE, Geoscience & Remote Sensing; Tokyo; Japan
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  • 5
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    Calibration Results for J-ERS-1 SAR Data Produced by the Alaska SAR Facility (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: The Alaska SAR Facility has been receiving and processing SAR data from the J-ERS-1 satellite since Spring 1992. Corner reflectors have been set up for J-ERS-1 SAR calibration at a site near Delta Junction, in central Alaska. Image quality and calibration analysis results from the Delta Junction site and others will be presented in this paper. The impact of the 3-bit Analog-to-Digital Converter and the automatic stepping of the gain as a function of range in the J-ERS-1 radar receiver on calibration performance has been assessed. Preliminary observations on J-ERS-1 SAR data are that the average Signal-to-Noise ratio is generally fairly low, in the range 5-6dB. Azimuth ambiguity levels are higher than preflight analysis indicated. Over land, the dynamic range in the backscatter at L-band for approximately 36 degree incidence angle is often fairly high.
    Keywords: Earth Resources and Remote Sensing
    Type: IEEE, Geoscience and Remote Sensing; Tokyo; Japan
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  • 6
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    Calibration Results for J-ERS-1 SAR Data Produced by the Alaska SAR Facility (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: The Alaska SAR Facility has been receiving and processing SAR data from the J-ERS-1 satellite since Spring 1992. Corner reflectors have been set up for J-ERS-1 SAR calibration at a site near Delta Junction, in central Alaska. Image quality and calibration analysis results from the Delta Junction site and others will be presented in this paper. The impact of the 3-bit Analog-to-Digital Converter and the automatic stepping of the gain as a function of range in the J-ERS-1 radar receiver on calibration performance has been assessed. Preliminary observations on J-ERS-1 SAR data are that the average Signal-to-Noise ratio is generally fairly low, in the range 5-6 dB. Azimuth ambiguity levels are higher than preflight analysis indicated. Over land, the dynamic range in the backscatter at L-band for approximately 36 degree incidence angle is often fairly high...
    Keywords: Earth Resources and Remote Sensing
    Type: IEEE, Geoscience & Remote Sensing; Tokyo; Japan
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  • 7
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    The Effects of Noise on Polarimetric SAR Data (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Polarimetric SAR data can provide a great deal of information about the scattering behavior of the surface under observation. Polarimetric SAR systems often measure the scattering matrices of the areas under observation in linear polarizations (H and V). From the scattering matrix commonly used forms such as the covariance matrix and the Stokes matrix can be easily derived. Other measures derived from polarimetric SAR data include correlation coefficients between scattering matrix terms and the mode and variance of phase differences between scattering matrix terms. The effects of additive system noise on these measurements is not often considered in the literature on this subject. In this paper, the effects of additive system noise on measurements derived from polarimetric SAR data will be examined. It will be shown how first-order noise effects can be removed and how second-order noise effects can be reduced for some measurements...
    Keywords: Earth Resources and Remote Sensing
    Type: IEEE, Geoscience & Remote Sensing; Tokyo; Japan
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  • 8
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    Remote Sensing of Tropical Forests with Multi-Frequency Polarimetric Radar (AIRSAR) as an Aid in Vegetation Classification (1994)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Vegetation maps of inaccessible areas in the tropics tend to divide vegetation into broad types.
    Keywords: Earth Resources and Remote Sensing
    Type: German Botanical Congress; Bayreuth; Germany
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  • 9
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    Advanced manned launch system study status (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Various concepts for advanced manned launch systems (AMLS) are examined for delivery missions to Space Station and polar orbit. Included are single- and two-stage winged systems with rocket and/or airbreathing propulsion systems. For near-term technologies, two-stage, reusable rocket systems are favored over single-stage rocket or airbreathing/rocket systems. Advanced technologies enable viable single-stage-to-orbit (SSTO) concepts. Although two-stage rocket systems continue to be lighter in dry weight than SSTOs, advantages in simpler operations may make SSTOs more cost-effective over the life cycle. Generally, rocket systems maintain a dry weight advantage over airbreathing systems at advanced technology levels, but to a lesser degree than when near-term technologies are used. More detailed understanding of vehicle systems and associated ground and flight operations requirements and procedures is essential in determining quantitative discrimination between these latter concepts.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: IAF PAPER 91-193
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  • 10
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    Manned Mars aerobrake vehicle design issues (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The paper examines the preliminary definition of the stagnation region aerothermodynamic environment, the effect of convective/radiative effect of trim angle-of-attack mispredictions, packaging issues, and the implications of wake flow for vehicles not having an aft aeroshell. The implications of each of these factors for a Mars aerobrake configuration with a L/D in the range of 0.3-0.5 is evaluated. It is shown that packaging and wake flow requirements have a significant impact on the final design of a low L/D aerobrake. Due to the large proportion of carbonaceous species in the Martian atmosphere, radiative heating is seen to play a more dominant role in the stagnation region aerothermodynamics than for an equivalent earth entry. It is concluded that this radiation amplification is an additional reason to consider a multiple aerobrake system.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: IAF PAPER 90-197
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