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  • ATOMIC AND MOLECULAR PHYSICS  (2)
  • AIRCRAFT INSTRUMENTATION  (1)
  • I21
  • 1990-1994  (3)
  • 1
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    Cross-calibration between airborne SAR sensors (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: As Synthetic Aperture Radar (SAR) system performance and experience in SAR signature evaluation increase, quantitative analysis becomes more and more important. Such analyses require an absolute radiometric calibration of the complete SAR system. To keep the expenditure on calibration of future multichannel and multisensor remote sensing systems (e.g., X-SAR/SIR-C) within a tolerable level, data from different tracks and different sensors (channels) must be cross calibrated. The 1989 joint E-SAR/DC-8 SAR calibration campaign gave a first opportunity for such an experiment, including cross sensor and cross track calibration. A basic requirement for successful cross calibration is the stability of the SAR systems. The calibration parameters derived from different tracks and the polarimetric properties of the uncalibrated data are used to describe this stability. Quality criteria for a successful cross calibration are the agreement of alpha degree values and the consistency of radar cross sections of equally sized corner reflectors. Channel imbalance and cross talk provide additional quality in case of the polarimetric DC-8 SAR.
    Keywords: AIRCRAFT INSTRUMENTATION
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); 31; 1; p. 237-245.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Atomic oxygen fine-structure splittings with tunable far-infrared spectroscopy (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Fine-structure splittings of atomic oxygen (O-16) in the ground state have been accurately measured using a tunable far-infrared spectrometer. The 3P0-3pl splitting is 2,060,069.09 (10) MHz, and the 3Pl-3P2 splitting is 4,744,777.49 (16) MHz. These frequencies are important for measuring atomic oxygen concentration in earth's atmosphere and the interstellar medium.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 371; L85
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Far-infrared self-broadening in methylcyanide - Absorber-perturber resonance (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Using tunable far-infrared spectrometers with high-frequency stability and accuracy, the self-pressure broadening and shift of CH3CN are measured. Evidence of absorber-perturber resonance effects on the collisional line shape are obtained. This tests the theoretical model and its possible improvements and also allows predictions of broadening and shift for a large class of molecules. Moreover, the resonance effect produces a theoretical temperature dependence of self-broadening that is different from what is commonly assumed.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Physical Review A (ISSN 1050-2947); 45; 9 Ma
    Format: text
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    NASA TECHNICAL REPORTS
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