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  • 1
    Publication Date: 2018-12-01
    Description: This paper describes Landsat-4 sensors, spacecraft disturbances, and the methodology used to correct Thematic Mapper (TM) images. The discussion includes system requirements, mathematical modeling, in-orbit angular motion measurement, Fast Fourier Transformer (FFT) data analysis, and scan system correction. Emphasis is given to the cause and effect of the electromechanical disturbances beginning with the scan mirror and its interaction and sensitivity to externally and self-generated disturbances. Ground-testing results are compared with those obtained in orbit.
    Type: IAF PAPER 84-117
    Format: text
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  • 2
    Publication Date: 2013-08-31
    Description: The required extension, enhancement, and upgrading of the present Spartan concept are described to conduct operations from the space station using the station's unique facilities and operational features. The space station Spartan (3S), the free flyer will be deployed from and returned to the space station and will conduct scientific missions of much longer duration than possible with the current Spartan. The potential benefits of a space station Spartan are enumerated. The objectives of the study are: (1) to develop a credible concept for a space station Spartan; and (2) to determine the associated requirements and interfaces with the space station to help ensure that the 3S can be properly accommodated.
    Type: NAS 1.15:86215 , NASA-TM-86215 , REPT-85F0220
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  • 3
    In:  CASI
    Publication Date: 2016-06-07
    Description: A very high resolution radiometer is reported that produces visible and infrared images onboard meteorological satellites. The device has a visible and an infrared channel, a resolution in both spectral bands of 0.9260 kilometers from a 1460 kilometer polar orbit, and scans from horizon to horizon. A two stage radiant cooler with cooled outer housing permits operation in the 100 degrees kelvin range.
    Type: Significant Accomplishments in Technol., 1972; p 77-81
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  • 4
    In:  Other Sources
    Publication Date: 2011-08-19
    Description: Landsats 4 and 5, the latest in the series of unmanned earth observation satellites, are used as the space platform for two remote sensing, mechanical scanning instruments: the multispectral scanner (MSS) and the recently developed thematic mapper (TM). The primary objective of the experimental portion of the Landsat 4 and 5 missions is to assess the capability of the TM to provide improved information relative to the MSS.The higher spatial resolution of the TM over the MSS requires a higher degree of flight segment attitude stability than the earlier Landsats; therefore, a more stable, low-orbit space platform must be provided. This paper describes the orbital, electrical, mechanical, and thermal characteristics of Landsat 4 and 5 flight segment with special emphasis on the TM and MSS interfaces. Also described are flight segment disturbances caused by the TM and MSS scanning mirrors, motion from the Tracking and Data Relay Satellite (TDRS) antenna, solar array, and the attitude control system (ACS).
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