Pseudorandom noise code-based technique for thin-cloud discrimination with CO2 and O2 absorption measurements

Joel F. Campbell; Narasimha S. Prasad; Michael A. Flood

doi:10.1117/1.3658758

1 December 2011 Pseudorandom noise code-based technique for thin-cloud discrimination with CO₂ and O₂absorption measurements

Joel F. Campbell, Narasimha S. Prasad, Michael A. Flood

Author Affiliations +

Optical Engineering, Vol. 50, Issue 12, 126002 (December 2011). https://doi.org/10.1117/1.3658758

Abstract

NASA Langley Research Center is working on a continuous wave (cw) laser-based remote sensing scheme for the detection of CO₂and O₂ from space-based platforms suitable for an 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, multifrequency, intensity modulated cw laser absorption spectrometer operating at 1.57 μm 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 pseudonoise code-based technique for cloud and aerosol discrimination applications. The possibility of using maximum length sequences for range and absorption measurements is investigated. A simple model for accomplishing this objective is formulated. Proof-of-concept experiments carried out using a sonar-based LIDAR simulator that was built using simple audio hardware provided promising results for extension into optical wavelengths.

©(2011) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Joel F. Campbell, Narasimha S. Prasad, and Michael A. Flood "Pseudorandom noise code-based technique for thin-cloud discrimination with CO₂ and O₂absorption measurements," Optical Engineering 50(12), 126002 (1 December 2011). https://doi.org/10.1117/1.3658758

Published: 1 December 2011

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