NDLI: Pseudorandom noise code-based technique for thin cloud discrimination with co2 and o2 absorption measurements

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Pseudorandom noise code-based technique for thin cloud discrimination with co2 and o2 absorption measurements

Content Provider	NASA Technical Reports Server (NTRS)
Author	Prasad, Narasimha S. Campbell, Joel F. Flood, Michael A.
Copyright Year	2011
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.
File Size	1058398
Page Count	14
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20120000535
Archival Resource Key	ark:/13960/t0zp9184q
Language	English
Publisher Date	2011-01-01
Access Restriction	Open
Subject Keyword	Lasers And Masers Differential Absorption Lidar Absorption Spectroscopy Oxygen Signal To Noise Ratios Pseudonoise Photometers Earth Sciences Remote Sensing Computer Programs Carbon Dioxide Concentration Laser Spectrometers Aerosols Clouds Meteorology Polynomials Simulators Detection Continuous Wave Lasers Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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