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  • 1
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    Technique for absolute temperature measurements at microwave frequencies. (1967)
    In:  Other Sources
    Details
    Publication Date: 2011-08-11
    Description: Radiometric technique for absolute temperature measurement of microwave noise sources under field conditions
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: REVIEW OF SCIENTIFIC INSTRUMENTS
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Advanced synthetic aperture radar for remote sensing (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A program initiated by NASA was formed to address some key earth resources synthetic aperture radar (SAR) needs. Major steps in the SAR system development are summarized, and the objective of the advanced SAR (ASAR) program is defined. The program rationale and specific objectives are discussed, including system calibration, wide-band technique evaluation, a system resolution of 10 m or better at 45 deg, and an airborne system to cover four bands within 1 to 10 GHz. The ASAR conceptual system design, consisting of a modulator, transmitter, antenna, receiver, calibrator, and data system modules is also presented, and ASAR capability expansions are discussed. The program, scheduled for 1983, will provide a data source which is not available to applications investigations at this time, and will produce design approaches that are flexible and multimission to the maximum extent for application to a Shuttle or a freeflyer system.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: EASCON ''80; Electronics and Aerospace Systems Conference; Sep 29, 1980 - Oct 01, 1980; Arlington, VA
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    An earth and ocean SAR for Space Shuttle - User requirements and data handling implications (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A brief summary is presented of user requirements for the Shuttle synthetic aperture radar (SAR) to be flown on a sortie mission of 7 to 10 days in duration, based on information collected from survey of the literature and direct user contacts. This information suggests selection of a dual frequency (L and X band) dual polarization SAR capable of meeting most user requirements. Particular attention is given to the SAR system specifications and the data handling capability expected to be available during the 1980s for the tracking and data relay satellite system (TDRSS). The data link requirements of the majority of Shuttle experiments will eventually determine whether the necessary high-capacity Shuttle-TDRSS return link will be part of the intrinsic Shuttle capability or will be part of the SAR payload.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: National Telecommunications Conference; Dec 01, 1975 - Dec 03, 1975; New Orleans, LA
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The evolution of the SEASAT imaging radar (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper describes the design parameters and development of a synthetic aperture radar for use on the SEASAT spacecraft. This imaging radar is designed to operate at altitudes of 800 km with an orbital inclination of 108 deg, a nominal resolution of 25 m, and a swath width of 100 km. The design evolved from planetary imaging radar studies conducted over many years where an L-band imaging radar was developed and tested on aircraft flights as a prototype system to map the surface of Venus. A solid-state transmitter is used where the pulse repetition frequency is a function of altitude and will be about 2kHz for a 12-m long antenna. The receiver consists of the receiver protector, input filters, the gain control, and the RF amplifier. The ground station uses the standard NASA receiver with a 10-m antenna. The correlator, either optical or digital, must be able to compensate for the pitch and yaw variations of the spacecraft as well as the inherent effective yaw caused by the rotation of the earth, and extract the range curvature and range walk effects.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: National Telecommunications Conference; Dec 01, 1975 - Dec 03, 1975; New Orleans, LA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Method and means for providing an absolute power measurement capability Patent (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Input radio frequency circuit for switching type absolute temperature measuring radiometer for noise sources
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Method and apparatus for measuring solar activity and atmospheric radiation effects (1973)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A radiometric measuring system is described for observing solar activity, atmospheric attenuation, and atmospheric emission. Two highly directional microwave antennas are mounted side by-side on an equatorial mount which tracks the sun. One antenna is aimed directly at the sun to provide a sun temperature, and the other antenna is aimed at a slight angle to the sun antenna to provide a sky temperature reference. Signals from the two antennas are compared in a radiometric detecting system and provide information concerning solar activity and atmospheric attenuation and emission.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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