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  • 2010-2014  (5)
  • 2011  (5)
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  • 2010-2014  (5)
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  • 1
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    Calibration and flight results for the Ares I-X 5-hole probe (2011)
    Elsevier
    Details
    Publication Date: 2011-04-01
    Print ISSN: 0094-5765
    Electronic ISSN: 1879-2030
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Elsevier
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    PAPER CURRENT
  • 2
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    Pseudorandom Noise Code-Based Technique for Cloud and Aerosol Discrimination Applications (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: NASA Langley Research Center is working on a continuous wave (CW) laser based remote sensing scheme for the detection of CO2 and O2 from space based platforms suitable for ACTIVE SENSING OF CO2 EMISSIONS OVER NIGHTS, DAYS, AND SEASONS (ASCENDS) mission. ASCENDS is a future space-based mission to determine the global distribution of sources and sinks of atmospheric carbon dioxide (CO2). A unique, multi-frequency, intensity modulated CW (IMCW) laser absorption spectrometer (LAS) operating at 1.57 micron for CO2 sensing has been developed. Effective aerosol and cloud discrimination techniques are being investigated in order to determine concentration values with accuracies less than 0.3%. In this paper, we discuss the demonstration of a PN code based technique for cloud and aerosol discrimination applications. The possibility of using maximum length (ML)-sequences for range and absorption measurements is investigated. A simple model for accomplishing this objective is formulated, Proof-of-concept experiments carried out using SONAR based LIDAR simulator that was built using simple audio hardware provided promising results for extension into optical wavelengths. Keywords: ASCENDS, CO2 sensing, O2 sensing, PN codes, CW lidar
    Keywords: Optics
    Type: Paper 8037-20 , SPIE Defense, Security, and Sensing 2011 , SPIE Defense, Security, and Sensing 2011; Apr 25, 2011 - Apr 29, 2011; Orlando, FL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Pseudorandom Noise Code-Based Technique for Thin Cloud Discrimination with CO2 and O2 Absorption Measurements (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: NASA Langley Research Center is working on a continuous wave (CW) laser based remote sensing scheme for the detection of CO2 and O2 from space based platforms suitable for ACTIVE SENSING OF CO2 EMISSIONS OVER NIGHTS, DAYS, AND SEASONS (ASCENDS) mission. ASCENDS is a future space-based mission to determine the global distribution of sources and sinks of atmospheric carbon dioxide (CO2). A unique, multi-frequency, intensity modulated CW (IMCW) laser absorption spectrometer (LAS) operating at 1.57 micron for CO2 sensing has been developed. Effective aerosol and cloud discrimination techniques are being investigated in order to determine concentration values with accuracies less than 0.3%. In this paper, we discuss the demonstration of a pseudo noise (PN) code based technique for cloud and aerosol discrimination applications. The possibility of using maximum length (ML)-sequences for range and absorption measurements is investigated. A simple model for accomplishing this objective is formulated, Proof-of-concept experiments carried out using SONAR based LIDAR simulator that was built using simple audio hardware provided promising results for extension into optical wavelengths.
    Keywords: Lasers and Masers
    Type: NF1676L-13229
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A Low Cost Remote Sensing System Using PC and Stereo Equipment (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A system using a personal computer, speaker, and a microphone is used to detect objects, and make crude measurements using a carrier modulated by a pseudorandom noise (PN) code. This system can be constructed using a personal computer and audio equipment commonly found in the laboratory or at home, or more sophisticated equipment that can be purchased at reasonable cost. We demonstrate its value as an instructional tool for teaching concepts of remote sensing and digital signal processing.
    Keywords: Earth Resources and Remote Sensing
    Type: NF1676L-12948
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Calibration and Flight Results for the Ares I-X 5-Hole Probe (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Flight and calibration results are presented for the Ares I-X 5-hole probe. The probe is calibrated by using a combination of wind tunnel, CFD, and other numerical modeling techniques. This is then applied to the probe flight data and comparisons are made between the vanes and 5-hole probe. Using this and other data it is shown the probe was corrupted by water rendering that measurement unreliable.
    Keywords: Spacecraft Instrumentation and Astrionics
    Type: NF1676L-10448
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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