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  • Other Sources  (20)
  • Earth Resources and Remote Sensing  (10)
  • LAUNCH VEHICLES AND SPACE VEHICLES  (6)
  • ASTROPHYSICS  (3)
  • GENERAL
  • 2015-2019  (3)
  • 1990-1994  (17)
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  • Other Sources  (20)
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Keywords
Years
Year
  • 1
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    Manned Mars aerobrake vehicle design issues (1992)
    In:  Other Sources
    Details
    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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  • 2
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    Advanced manned launch system study status (1993)
    In:  Other Sources
    Details
    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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    Line structures in the X-ray spectra of Cygnus X-2 observed with Exosat (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Cygnus X-2 was observed with Exosat at five phases of a single orbital cycle in September of 1983. The results of spectral fits of the LE + ME (Argon) data are summarized in terms of a superposition of thermal bremsstrahlung and blackbody components. During the first observation, a grating spectrum was obtained, and this is described in some detail. The GSPC data are used to investigate the presence of iron features and their behavior during dips.
    Keywords: ASTROPHYSICS
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  • 4
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    Development of SIR-C Ground Calibration Equipment (1993)
    In:  Other Sources
    Details
    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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  • 5
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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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  • 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 5-6dB. 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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  • 7
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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
    Format: text
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  • 8
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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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  • 9
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    PACE and EISCAT radar observations of short-lived flow bursts on the nightside (1991)
    In:  CASI
    Details
    Publication Date: 2018-06-27
    Description: Concurrent observations from two widely spaced radar experiments of quasi periodic flow bursts in the nightside are presented. The flow bursts closely resemble single radar observations reported by Williams et al. By using the Polar Anglo-American Conjugate Experiment (PACE) HF radar array at Halley Bay in conjunction with the EISCAT Common Program (CP) 2-D experiment, the flow bursts are shown to be a global phenomenon and important information as to their development and propagation can be determined.
    Keywords: ASTROPHYSICS
    Type: Oulu Univ., Fifth EISCAT Scientific Workshop: Programme and Abstracts; 1 p
    Format: application/pdf
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  • 10
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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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